def measure(self, Vgs, stabilise_time, init, use_vna, data_dir, comment, **kwargs):
print("===================================")
print("Starting acquisition script...")
vna_string = ''
# initialise instruments
try:
print("----------------------------------------")
print("Setting up Keithley DC sources...")
self.sourceVg = sourceVg = K2400('GPIB::24::INSTR', sourcemode='v', vrang=200, irang=10e-6, slope=1, initialise=init)
print("DC sources are set up.")
except:
print("There has been an error setting up DC sources.")
raise
if use_vna:
print("Setting up VNA...")
vna = AnritsuVNA('GPIB::6::INSTR')
sweeptime = vna.get_sweep_time()
if vna.get_sweep_type() != 'FSEGM':
raise Exception('Please use segmented frequency sweep')
# check if the RF power is the same on both ports and for all
# frequency segments
count = int(vna.query(':SENS:FSEGM:COUN?'))
vna_pow = None
for i in range(1,count+1):
port1pow = float(vna.query(':SENS:FSEGM{}:POW:PORT1?'.format(i)))
port2pow = float(vna.query(':SENS:FSEGM{}:POW:PORT2?'.format(i)))
if vna_pow is None and port1pow == port2pow:
vna_pow = port1pow
elif vna_pow is not None and port1pow == port2pow and port1pow == vna_pow:
continue
else:
raise Exception("Please select the same power for all ports and frequency segments")
port1att = vna.get_source_att(1)
port2att = vna.get_source_att(2)
if port1att == port2att:
vna_pow -= port1att
else:
raise Exception("Please select the same attenuators for both ports")
vna_string = '_pwr={:.0f}'.format(vna_pow)
print("VNA is set up.")
# define name
timestamp = time.strftime('%Y-%m-%d_%Hh%Mm%Ss')
filename = timestamp + vna_string + ('_'+comment if comment else '')
# prepare saving RF data
spectra_fol = os.path.join(data_dir, filename)
create_path(spectra_fol)
# prepare saving DC data
self.prepare_saving(os.path.join(data_dir, filename + '.txt'))
if use_vna:
# prepare saving RF data
spectra_fol = os.path.join(data_dir, filename)
create_path(spectra_fol)
# save segmented frequency sweep data to file
with open(os.path.join(spectra_fol, 'VNAconfig'), 'w') as f:
vna.dump_freq_segments(f)
# loop
for Vg in Vgs:
if self.flags['quit_requested']:
return locals()
print('Setting Vg='+str(Vg)+' V...')
sourceVg.set_voltage(Vg)
time.sleep(stabilise_time)
# measure
Vgm = sourceVg.get_voltage()
Ileak = sourceVg.get_current()
# save data
self.save_row(locals())
# save VNA data
if use_vna:
# save VNA data
print("Getting VNA spectra...")
vna.single_sweep(wait=False)
# display sweep progress
progressbar_wait(sweeptime)
# make sure sweep is really done
while not vna.is_sweep_done():
time.sleep(0.5)
table = vna.get_table([1,2,3,4])
timestamp = time.strftime('%Y-%m-%d_%Hh%Mm%Ss')
spectrum_file = timestamp+'_Vg={:.3f}.txt'.format(Vg)
np.savetxt(os.path.join(spectra_fol, spectrum_file), np.transpose(table))
print("Acquisition done.")
return locals()
def measure(self, data_dir, Vgs, Vchucks, Rg, comment, stabilise_time,
stab_chuck_time, use_vna, init_bilt, **kwargs):
print("===================================")
print("Starting acquisition script...")
chuck_string = ''
vna_string = ''
# initialise instruments
print("Setting up DC sources and voltmeters...")
bilt = Bilt('TCPIP0::192.168.0.2::5025::SOCKET')
if init_bilt:
# source (bilt, channel, range, filter, slope in V/ms, label):
self.sourceVg = sourceVg = BiltVoltageSource(
bilt, "I1", "12", "1", 0.005, "Vg")
else:
self.sourceVg = sourceVg = BiltVoltageSource(bilt,
"I1",
initialise=False)
# voltmeter (bilt, channel, filt, label=None)
self.meterVg = meterVg = BiltVoltMeter(bilt, "I5;C1", "2", "Vgm")
print("DC sources and voltmeters are set up.")
print("Setting up Yokogawa for chuck voltage...")
# connect to the Yoko without initialising, this will lead to
# an exception if the Yoko is not properly configured (voltage
# source, range 30V, output ON)
self.yoko = yoko = Yoko7651('GPIB::3::INSTR',
initialise=False,
rang=30,
slope=1.)
print("Yokogawa is set up.")
if use_vna:
print("Setting up VNA...")
vna = AnritsuVNA('GPIB::6::INSTR')
sweeptime = vna.get_sweep_time()
if vna.get_sweep_type() != 'FSEGM':
raise Exception('Please use segmented frequency sweep')
# check if the RF power is the same on both ports and for all
# frequency segments
count = int(vna.query(':SENS:FSEGM:COUN?'))
vna_pow = None
for i in range(1, count + 1):
port1pow = float(
vna.query(':SENS:FSEGM{}:POW:PORT1?'.format(i)))
port2pow = float(
vna.query(':SENS:FSEGM{}:POW:PORT2?'.format(i)))
if vna_pow is None and port1pow == port2pow:
vna_pow = port1pow
elif vna_pow is not None and port1pow == port2pow and port1pow == vna_pow:
continue
else:
raise Exception(
"Please select the same power for all ports and frequency segments"
)
port1att = vna.get_source_att(1)
port2att = vna.get_source_att(2)
if port1att == port2att:
vna_pow -= port1att
else:
raise Exception(
"Please select the same attenuators for both ports")
vna_string = '_pwr={:.0f}'.format(vna_pow)
print("VNA is set up.")
# prepare saving DC data
timestamp = time.strftime('%Y-%m-%d_%Hh%Mm%Ss')
filename = timestamp + vna_string + ('_' + comment if comment else '')
self.prepare_saving(os.path.join(data_dir, filename + '.txt'))
if use_vna:
# prepare saving RF data
spectra_fol = os.path.join(data_dir, filename)
create_path(spectra_fol)
# save segmented frequency sweep data to file
with open(os.path.join(spectra_fol, 'VNAconfig'), 'w') as f:
vna.dump_freq_segments(f)
for Vchuck in Vchucks:
print("Setting Vchuck = {}".format(Vchuck))
# set Vchuck
yoko.set_voltage(Vchuck)
# wait
time.sleep(stab_chuck_time)
for Vg in Vgs:
if self.flags['quit_requested']:
print("Stopping acquisition.")
return locals()
print("Setting Vg = {}".format(Vg))
# set Vg
sourceVg.set_voltage(Vg)
# wait
time.sleep(stabilise_time)
# read voltages
Vgm = meterVg.get_voltage()
# do calculations
Ileak = (Vg - Vgm) / Rg
# save DC data
self.save_row(locals())
if use_vna:
# save VNA data
print("Getting VNA spectra...")
vna.single_sweep(wait=False)
# display sweep progress
progressbar_wait(sweeptime)
# make sure sweep is really done
while not vna.is_sweep_done():
time.sleep(0.5)
table = vna.get_table([1, 2, 3, 4])
timestamp = time.strftime('%Y-%m-%d_%Hh%Mm%Ss')
spectrum_file = timestamp + '_Vg={:.3f}_Vchuck={:.1f}.txt'.format(
Vg, Vchuck)
np.savetxt(os.path.join(spectra_fol, spectrum_file),
np.transpose(table))
print("Acquisition done.")
return locals()
def measure(self, sweep_type, src_Vg, src_Vds, src_Vchuck, src_vna,
data_dir, comment, mesurement_station, Vdss, Vgs, Vchucks,
Rg_Bilt_Only, Rds_Bilt_Only, WxL, max_pwr, max_Ileak,
stabilise_time, slope_vg_vd, slope_vchuck, **kwargs):
print("****************************************")
print("===================================")
print("Starting acquisition script")
self.sourceVchuck = None
vna_string = ''
temp_string = ''
if (mesurement_station == 'None'):
print("Please chose a mesurement station first")
raise
#initialise instruments
if (sweep_type == 'initialise_instruments'):
init_instruments = True
else:
init_instruments = False
# #select correct vna
# if (use_vna == 'True' and mesurement_station == 'JANIS'):
# src_vna = 'anritsu'
# elif (use_vna == 'True' and mesurement_station == 'Cascade'):
# src_vna = 'zva67'
# else:
# src_vna = 'None'
#------------------------------------------------------------------------#
#------------------------------------------------------------------------#
#set instruments
if (mesurement_station == 'JANIS'):
yoko_address = 'GPIB::3::INSTR'
k2000_address = 'GPIB::20::INSTR'
bilt_address = 'TCPIP0::192.168.0.2::5025::SOCKET'
anritsu_address = 'GPIB::6::INSTR'
temperature_address = 'GPIB::14::INSTR'
position_source_bilt = "I"
position_meter_bilt = "I5;C"
if (mesurement_station == 'Cascade'):
yoko_address = 'GPIB::10::INSTR'
k2000_address = 'GPIB::15::INSTR'
bilt_address = 'TCPIP0::192.168.0.5::5025::SOCKET'
zva67_address = '192.168.0.3'
temperature_address = 'ASRL5::INSTR'
position_source_bilt = "I3;C"
position_meter_bilt = "I1;C"
k2400_address = 'GPIB::24::INSTR'
k2600_address = 'GPIB::24::INSTR'
#------------------------------------------------------------------------#
#------------------------------------------------------------------------#
# initialise SI9700 temperature controler
if (mesurement_station == 'JANIS'):
try:
print("----------------------------------------")
print("Setting up SI9700 temperature controller...")
tc = SI9700(temperature_address)
temp_string = '_T={:.1f}'.format(
(tc.get_temp('a') + tc.get_temp('b')) / 2)
print("Temperature controller SI9700 is set up.")
except:
print(
"There has been an error setting up the SI9700 temperature controller."
)
raise
elif (mesurement_station == 'Cascade'):
try:
print("----------------------------------------")
print("Setting up TIC500 temperature controller...")
tc = TIC500(temperature_address)
temp_string = '_T={:.1f}'.format(tc.get_temp('Chuck'))
print("Temperature controller TIC500 is set up.")
except:
print(
"There has been an error setting up the TIC500 temperature controller."
)
raise
# initialise K2400
if (src_Vg == 'K2400' or src_Vds == 'K2400' or src_Vchuck == 'K2400'):
try:
print("----------------------------------------")
print("Setting up K2400 DC source...")
if src_Vg == 'K2400':
self.sourceVg = sourceVg = K2400(
k2400_address,
sourcemode='v',
vrang=200,
irang=100e-3,
slope=slope_vg_vd,
initialise=init_instruments)
if src_Vds == 'K2400':
self.sourceVds = sourceVds = K2400(
k2400_address,
sourcemode='v',
vrang=200,
irang=100e-3,
slope=slope_vg_vd,
initialise=init_instruments)
if src_Vchuck == 'K2400':
self.sourceVchuck = sourceVchuck = K2400(
k2400_address,
sourcemode='v',
vrang=200,
irang=100e-3,
slope=slope_vchuck,
initialise=init_instruments)
print("K2400 DC source are set up.")
except:
print("There has been an error setting up K2400 DC sources.")
raise
# initialise K2600
if (src_Vg == 'K2600' or src_Vds == 'K2600' or src_Vchuck == 'K2600'):
try:
print("----------------------------------------")
print("Setting up K2600 DC source...")
if src_Vg == 'K2600':
self.sourceVg = sourceVg = K2600(
k2600_address,
slope=slope_vg_vd,
initialise=init_instruments)
if src_Vds == 'K2600':
self.sourceVds = sourceVds = K2600(
k2600_address,
slope=slope_vg_vd,
initialise=init_instruments)
if src_Vchuck == 'K2600':
self.sourceVchuck = sourceVchuck = K2600(
k2600_address,
slope=slope_vchuck,
initialise=init_instruments)
print("K2600 DC source are set up.")
except:
print("There has been an error setting up K2600 DC sources.")
raise
# initialise YOKO
if (src_Vchuck == 'Yoko'):
try:
print("----------------------------------------")
print("Setting up Yokogawa DC source...")
self.sourceVchuck = sourceVchuck = Yoko7651(
yoko_address,
initialise=init_instruments,
rang=30,
slope=slope_vchuck)
print("Yokogawa DC source are set up.")
except:
print("There has been an error setting up the chuck voltage.")
raise
# initialise BILT
if (src_Vg[0:4] == 'Bilt' or src_Vds[0:4] == 'Bilt'):
try:
print("----------------------------------------")
print("Setting up BILT DC sources and voltmeters...")
bilt = Bilt(bilt_address)
if (src_Vg[0:4] == 'Bilt'):
src_Vg, port_Vg = src_Vg.split('_')
self.sourceVg = sourceVg = BiltVoltageSource(
bilt,
position_source_bilt + port_Vg,
rang="12",
filt="1",
slope=slope_vg_vd,
label=None,
initialise=init_instruments)
self.meterVg = meterVg = BiltVoltMeter(
bilt,
position_meter_bilt + port_Vg,
filt="2",
label="Vgm")
if (src_Vds[0:4] == 'Bilt'):
src_Vds, port_Vds = src_Vds.split('_')
self.sourceVds = sourceVds = BiltVoltageSource(
bilt,
position_source_bilt + port_Vds,
rang="12",
filt="1",
slope=slope_vg_vd,
label=None,
initialise=init_instruments)
self.meterVds = meterVds = BiltVoltMeter(
bilt,
position_meter_bilt + port_Vds,
filt="2",
label="Vdsm")
print("BILT DC sources and voltmeters are set up.")
except:
print(
"There has been an error setting up BILT DC sources and voltmeters."
)
raise
# initialise VNA ZVA67
if src_vna == 'zva67':
print("Setting up VNA")
self.vna = vna = RohdeSchwarzVNA()
vna.open('TCPIP', '192.168.0.3')
c1 = vna.channel(1)
sweeptime = c1.total_sweep_time_ms
c1.init_nonblocking_sweep((1, 2))
if not c1.is_corrected():
raise Exception('Please calibrate or switch on correction.')
if c1.sweep_type != 'SEGM':
raise Exception('Please use segmented frequency sweep')
# check if the RF power is the same on both ports and for all
# frequency segments
vna_pow = np.unique(np.asarray(c1.get_frequency_segments())[:, 5])
if len(vna_pow) > 1:
raise Exception(
"Please select the same power for all ports and frequency segments"
)
vna_pow = vna_pow[0]
if c1.is_auto_attenuator(1) or c1.is_auto_attenuator(2):
raise Exception("Please do not use automatic attenuators")
port1att = c1.get_attenuator(1)
if port1att == c1.get_attenuator(2):
vna_pow -= port1att
else:
raise Exception(
"Please select the same attenuators for both ports")
vna_string = '_pwr={:.0f}'.format(vna_pow)
print("VNA is set up.")
# initialise VNA ANRITSU
if (src_vna == 'anritsu'):
try:
print("----------------------------------------")
print("Setting up ANRITSU VNA")
vna = AnritsuVNA(anritsu_address)
sweeptime = vna.get_sweep_time()
if vna.get_sweep_type() != 'FSEGM':
raise Exception('Please use segmented frequency sweep')
# check if the RF power is the same on both ports and for all
# frequency segments
count = int(vna.query(':SENS:FSEGM:COUN?'))
vna_pow = None
for i in range(1, count + 1):
port1pow = float(
vna.query(':SENS:FSEGM{}:POW:PORT1?'.format(i)))
port2pow = float(
vna.query(':SENS:FSEGM{}:POW:PORT2?'.format(i)))
if vna_pow is None and port1pow == port2pow:
vna_pow = port1pow
elif vna_pow is not None and port1pow == port2pow and port1pow == vna_pow:
continue
else:
raise Exception(
"Please select the same power for all ports and frequency segments"
)
port1att = vna.get_source_att(1)
port2att = vna.get_source_att(2)
if port1att == port2att:
vna_pow -= port1att
else:
raise Exception(
"Please select the same attenuators for both ports")
vna_string = '_pwr={:.0f}'.format(vna_pow)
print("ANRITSU VNA is set up.")
except:
print("There has been an error setting up the ANRITSU VNA.")
raise
print("----------------------------------------")
#------------------------------------------------------------------------#
#------------------------------------------------------------------------#
# define name
timestamp = time.strftime('%Y-%m-%d_%Hh%Mm%Ss')
filename = timestamp + vna_string + temp_string + ('_' + comment
if comment else '')
# prepare saving DC data
self.prepare_saving(os.path.join(data_dir, filename + '.txt'))
# prepare saving RF data
if src_vna != 'None':
spectra_fol = os.path.join(data_dir, filename)
create_path(spectra_fol)
# save config
if src_vna == 'zva67':
# prepare saving RF data
spectra_fol = os.path.join(data_dir, filename)
create_path(spectra_fol)
c1.save_frequency_segments(os.path.join(spectra_fol, 'VNAconfig'))
sweeptime_min = len(Vgs) * len(Vdss) * len(
Vchucks) * stabilise_time * (c1.total_sweep_time_ms *
1e3 if src_vna == 'zva67' else 1) / 60
remain_time_min = sweeptime_min
progress_percent = 0
if (sweep_type == 'give_time'
or sweep_type == 'initialise_instruments'):
# save data
self.save_row(locals())
# stop
return locals()
#------------------------------------------------------------------------#
#------------------------------------------------------------------------#
# loops
print("........................................")
print("Starting mesurement")
print("++++++++++++++++++++++++++++++++++++++++")
for Vchuck in Vchucks:
if src_Vchuck != "None":
sourceVchuck.set_voltage(Vchuck)
if (sweep_type == 'fix_Vds_sweep_Vg'):
for Vds in Vdss:
sourceVds.set_voltage(Vds)
for Vg in Vgs:
sourceVg.set_voltage(Vg)
# quit request
if self.flags['quit_requested']:
return locals()
# stabilise
time.sleep(stabilise_time)
# measure & calculate
if (src_Vds == 'K2400' or src_Vds == 'K2600'):
#mesure current directly
Ids = sourceVds.get_current()
if (src_Vds[0:4] == 'Bilt'):
#mesure current and convert in tension with resistor
Vdsm = meterVds.get_voltage()
Rs = Rds_Bilt_Only * Vdsm / (Vds - Vdsm)
Ids = Vds / Rs
if (src_Vg == 'K2400' or src_Vg == 'K2600'):
#mesure current directly
Ileak = sourceVg.get_current()
if (src_Vg[0:4] == 'Bilt'):
#mesure current and convert in tension with resistor
Vgm = meterVg.get_voltage()
Ileak = (Vg - Vgm) / Rg_Bilt_Only
pwr = (Vds * Ids) / (WxL)
# get temp
if (mesurement_station == 'JANIS'):
Ta = tc.get_temp('a')
Tb = tc.get_temp('b')
elif (mesurement_station == 'Cascade'):
Ta = tc.get_temp('Chuck')
Tb = tc.get_temp('Chuck')
# save data
self.save_row(locals())
#print
print("Getting mesurement Vg = {}".format(Vg) +
" and Vds = {}".format(Vds))
# save VNA data
if src_vna == 'zva67':
# save VNA data
print("Getting VNA spectra...")
c1.start_nonblocking_sweep()
# make sure sweep is really done
# display sweep progress
progressbar_wait(sweeptime / 1e3)
# make sure sweep is really done
while not c1.isdone_nonblocking_sweep():
time.sleep(0.5)
timestamp = time.strftime('%Y-%m-%d_%Hh%Mm%Ss')
spectrum_file = timestamp + '_Vg=%2.4f' % (
Vg) + '_Vds=%2.4f' % (Vds)
spectrum_file = os.path.join(
spectra_fol, spectrum_file + '.s2p')
c1.save_nonblocking_sweep(spectrum_file, (1, 2))
if src_vna == 'Anritsu':
vna.single_sweep()
table = vna.get_table(range(1, 4))
timestamp = time.strftime('%Y-%m-%d_%Hh%Mm%Ss')
spectrum_file = timestamp + '_Vg=%2.4f' % (
Vg) + '_Vds=%2.4f' % (Vds) + '.txt'
np.savetxt(
os.path.join(spectra_fol, spectrum_file),
np.transpose(table))
#mesure time
remain_time_min = remain_time_min - (
stabilise_time *
(c1.total_sweep_time_ms *
1e3 if src_vna == 'zva67' else 1) / 60)
progress_percent = (sweeptime_min - remain_time_min
) / sweeptime_min * 100
if (sweep_type == 'fix_Vg_sweep_Vds'):
for Vg in Vgs:
sourceVg.set_voltage(Vg)
first_pass = True
for Vds in Vdss:
#check power limit
if first_pass:
pwr = 0
else:
pwr = (Vds * Ids) / (WxL)
if (pwr > max_pwr):
pwr_limit = True
elif (pwr < max_pwr):
pwr_limit = False
if not pwr_limit:
sourceVds.set_voltage(Vds)
#quit request
if self.flags['quit_requested']:
return locals()
# stabilise
time.sleep(stabilise_time)
# measure & calculate
if (src_Vds == 'K2400' or src_Vds == 'K2600'):
#mesure current directly
Ids = sourceVds.get_current()
if (src_Vds[0:4] == 'Bilt'):
#mesure current and convert in tension with resistor
Vdsm = meterVds.get_voltage()
Rs = Rds_Bilt_Only * Vdsm / (Vds - Vdsm)
Ids = Vds / Rs
if (src_Vg == 'K2400' or src_Vg == 'K2600'):
#mesure current directly
Ileak = sourceVg.get_current()
if (src_Vg[0:4] == 'Bilt'):
#mesure current and convert in tension with resistor
Vgm = meterVg.get_voltage()
Ileak = (Vg - Vgm) / Rg_Bilt_Only
pwr = (Vds * Ids) / (WxL)
# get temp
if (mesurement_station == 'JANIS'):
Ta = tc.get_temp('a')
Tb = tc.get_temp('b')
elif (mesurement_station == 'Cascade'):
Ta = tc.get_temp('Chuck')
Tb = tc.get_temp('Chuck')
# do calculations
Ileak = (Vg - Vgm) / Rg_Bilt_Only
# save data
self.save_row(locals())
#print
print("Getting mesurement Vg = {}".format(Vg) +
" and Vds = {}".format(Vds))
# save VNA data
if src_vna == 'zva67':
# save VNA data
print("Getting VNA spectra...")
c1.start_nonblocking_sweep()
# display sweep progress
progressbar_wait(sweeptime / 1e3)
# make sure sweep is really done
while not c1.isdone_nonblocking_sweep():
time.sleep(0.5)
timestamp = time.strftime('%Y-%m-%d_%Hh%Mm%Ss')
spectrum_file = timestamp + '_Vg=%2.4f' % (
Vg) + '_Vds=%2.4f' % (Vds)
spectrum_file = os.path.join(
spectra_fol, spectrum_file + '.s2p')
c1.save_nonblocking_sweep(spectrum_file, (1, 2))
if src_vna == 'Anritsu':
vna.single_sweep()
table = vna.get_table(range(1, 4))
timestamp = time.strftime('%Y-%m-%d_%Hh%Mm%Ss')
spectrum_file = timestamp + '_Vg=%2.4f' % (
Vg) + '_Vds=%2.4f' % (Vds) + '.txt'
np.savetxt(
os.path.join(spectra_fol, spectrum_file),
np.transpose(table))
#mesure time
remain_time_min = remain_time_min - (
stabilise_time *
(c1.total_sweep_time_ms *
1e3 if src_vna == 'zva67' else 1) / 60)
progress_percent = (sweeptime_min - remain_time_min
) / sweeptime_min * 100
first_pass = False
print("++++++++++++++++++++++++++++++++++++++++")
print("Stopping measurement")
print("........................................")
return locals()
def measure(self, data_dir, Vgs, Vds, Rg, Rds, comment, stabilise_time,
**kwargs):
print("===================================")
print("Starting acquisition script...")
# initialise instruments
try:
print("Setting up DC sources and voltmeters...")
bilt = Bilt('TCPIP0::192.168.0.2::5025::SOCKET')
# source (bilt, channel, range, filter, slope in V/ms, label):
self.sourceVg = sourceVg = BiltVoltageSource(
bilt, "I2", "12", "1", 0.005, "Vg")
self.sourceVds = sourceVds = BiltVoltageSource(
bilt, "I3", "1.2", "1", 0.005, "Vds")
# voltmeter (bilt, channel, filt, label=None)
self.meterVg = meterVg = BiltVoltMeter(bilt, "I5;C2", "2", "Vgm")
self.meterVds = meterVds = BiltVoltMeter(bilt, "I5;C3", "2",
"Vdsm")
print("DC sources and voltmeters are set up.")
except:
print(
"There has been an error setting up DC sources and voltmeters."
)
raise
try:
print("Setting up VNA")
vna = AnritsuVNA('GPIB::6::INSTR')
self.freqs = vna.get_freq_list() # get frequency list
print("VNA is set up.")
except:
print("There has been an error setting up the VNA.")
raise
timestamp = time.strftime('%Y-%m-%d_%Hh%Mm%Ss')
# prepare saving DC data
filename = timestamp + ('_' + comment if comment else '')
self.prepare_saving(os.path.join(data_dir, filename + '.txt'))
# prepare saving RF data
spectra_fol = os.path.join(data_dir, filename)
try:
os.makedirs(spectra_fol)
except OSError as e:
if e.errno != errno.EEXIST:
raise
sourceVds.set_voltage(Vds)
for Vg in Vgs:
if self.flags['quit_requested']:
print("Stopping acquisition.")
return locals()
print("Setting Vg = {}".format(Vg))
# set Vg1 and 2
sourceVg.set_voltage(Vg)
# wait
time.sleep(stabilise_time)
# read voltages
Vgm = meterVg.get_voltage()
Vdsm = meterVds.get_voltage()
# do calculations
Ileak = (Vg - Vgm) / Rg
Rs = Rds * Vdsm / (Vds - Vdsm)
# save DC data
self.save_row(locals())
# save VNA data
print("Getting VNA spectra...")
vna.single_sweep()
table = vna.get_table([1, 2, 3, 4])
timestamp = time.strftime('%Y-%m-%d_%Hh%Mm%Ss')
spectrum_file = timestamp + '_Vg1_%2.4f' % (Vg) + '_Vds_%2.4f' % (
Vds) + '.txt'
np.savetxt(os.path.join(spectra_fol, spectrum_file),
np.transpose(table))
print("Acquisition done.")
return locals()
def measure(self, data_dir, comment, Vdss, Vg1s, Vg2s, commongate, Rg2,
Rds, stabilise_time, useVNA, **kwargs):
print("===================================")
print("Starting acquisition script...")
# initialise instruments
try:
print("Setting up DC sources and voltmeters...")
bilt = Bilt('TCPIP0::192.168.0.2::5025::SOCKET')
self.sourceVds = sourceVds = BiltVoltageSource(bilt,
"I1",
initialise=False)
self.sourceVg1 = sourceVg1 = BiltVoltageSource(bilt,
"I2",
initialise=False)
self.sourceVg2 = sourceVg2 = BiltVoltageSource(bilt,
"I3",
initialise=False)
self.meterVds = meterVds = BiltVoltMeter(bilt, "I5;C1", "2",
"Vdsm")
self.meterVg2 = meterVg2 = BiltVoltMeter(bilt, "I5;C3", "2",
"Vg2m")
print("DC sources and voltmeters are set up.")
except:
print(
"There has been an error setting up DC sources and voltmeters."
)
raise
if useVNA:
try:
print("Setting up VNA")
vna = AnritsuVNA('GPIB::6::INSTR')
self.freqs = vna.get_freq_list() # get frequency list
print("VNA is set up.")
except:
print("There has been an error setting up the VNA.")
raise
try:
print("Setting up temperature controller...")
tc = SI9700('GPIB::14::INSTR')
print("Temperature controller is set up.")
except:
print(
"There has been an error setting up the temperature controller."
)
raise
timestamp = time.strftime('%Y-%m-%d_%Hh%Mm%Ss')
# prepare saving DC data
filename = timestamp + ('_' + comment if comment else '')
self.prepare_saving(os.path.join(data_dir, filename + '.txt'))
# prepare saving RF data
if useVNA:
spectra_fol = os.path.join(data_dir, filename)
try:
os.makedirs(spectra_fol)
except OSError as e:
if e.errno != errno.EEXIST:
raise
# loops
for Vds in Vdss:
sourceVds.set_voltage(Vds)
for Vg2 in Vg2s:
if not commongate:
sourceVg2.set_voltage(Vg2)
for Vg1 in Vg1s:
if self.flags['quit_requested']:
return locals()
sourceVg1.set_voltage(Vg1)
if commongate:
Vg2 = Vg1
sourceVg2.set_voltage(Vg1)
# stabilise
time.sleep(stabilise_time)
# measure
Vdsm = meterVds.get_voltage()
Vg2m = meterVg2.get_voltage()
Ta = tc.get_temp('a')
Tb = tc.get_temp('b')
# do calculations
Ileak2 = (Vg2 - Vg2m) / Rg2
Rs = Rds * Vdsm / (Vds - Vdsm)
# save data
self.save_row(locals())
# save VNA data
if useVNA:
print("Getting VNA spectra...")
vna.single_sweep()
table = vna.get_table(range(1, 5))
timestamp = time.strftime('%Y-%m-%d_%Hh%Mm%Ss')
spectrum_file = timestamp + '_Vg1=%2.4f' % (
Vg1) + '_Vg2=%2.4f' % (Vg2) + '_Vds=%2.4f' % (
Vds) + '.txt'
np.savetxt(os.path.join(spectra_fol, spectrum_file),
np.transpose(table))
print("Acquisition done.")
return locals()
def measure(self, data_dir, Vgs, Vg0, Vchuck0, Vchuckmax, CapaRatio, Rg,
comment, stabilise_time, use_vna, init_bilt, init_yoko,
**kwargs):
print("===================================")
print("Starting acquisition script...")
# initialise instruments
try:
print("Setting up DC sources and voltmeters...")
bilt = Bilt('TCPIP0::192.168.0.2::5025::SOCKET')
if init_bilt:
# source (bilt, channel, range, filter, slope in V/ms, label):
self.sourceVg = sourceVg = BiltVoltageSource(bilt, "I1", "12", "1", 0.005, "Vg")
else:
self.sourceVg = sourceVg = BiltVoltageSource(bilt, "I1", initialise=False)
# voltmeter (bilt, channel, filt, label=None)
self.meterVg = meterVg = BiltVoltMeter(bilt, "I5;C1", "2", "Vgm")
# voltage source for chuck
self.yoko = yoko = Yoko7651("GPIB::3::INSTR", func="VOLT",
rang=30., slope=1.,
initialise=init_yoko, verbose=True)
print("DC sources and voltmeters are set up.")
except:
print("There has been an error setting up DC sources and voltmeters:")
raise
try:
print("Setting up VNA...")
vna = AnritsuVNA('GPIB::6::INSTR')
sweeptime = vna.get_sweep_time()
print("VNA is set up.")
except:
print("There has been an error setting up the VNA:")
raise
timestamp = time.strftime('%Y-%m-%d_%Hh%Mm%Ss')
# prepare saving DC data
filename = timestamp + ('_'+comment if comment else '')
self.prepare_saving(os.path.join(data_dir, filename+'.txt'))
if use_vna:
# prepare saving RF data
spectra_fol = os.path.join(data_dir, filename)
try:
os.makedirs(spectra_fol)
except OSError as e:
if e.errno != errno.EEXIST:
raise
if vna.get_sweep_type() == 'FSEGM':
with open(os.path.join(spectra_fol, 'VNAconfig'), 'w') as f:
vna.dump_freq_segments(f)
for Vg in Vgs:
if self.flags['quit_requested']:
print("Stopping acquisition.")
return locals()
print("Setting Vg = {}".format(Vg))
# calculate new chuck voltage to keep field constant
# set Vg
sourceVg.set_voltage(Vg)
Vchuck = Vchuck0+CapaRatio*(Vg-Vg0)
if np.abs(Vchuck) <= Vchuckmax:
print("Set chuck voltage:", Vchuck)
yoko.set_voltage(Vchuck)
else:
print("Chuck voltage too high:", Vchuck)
print("Not changing chuck voltage.")
Vchuck = yoko.get_voltage()
# wait
time.sleep(stabilise_time)
# read voltages
Vgm = meterVg.get_voltage()
# do calculations
Ileak = (Vg-Vgm)/Rg
# save DC data
self.save_row(locals())
if use_vna:
# save VNA data
print("Getting VNA spectra...")
vna.single_sweep(wait=False)
# display sweep progress
progressbar_wait(sweeptime)
# make sure sweep is really done
while not vna.is_sweep_done():
time.sleep(0.5)
table = vna.get_table([1,2,3,4])
timestamp = time.strftime('%Y-%m-%d_%Hh%Mm%Ss')
spectrum_file = timestamp+'_Vg=%2.4f_Vchuck=%2.4f'%(Vg, Vchuck)+'.txt'
np.savetxt(os.path.join(spectra_fol, spectrum_file), np.transpose(table))
print("Acquisition done.")
return locals()
def measure(self, step, startpoint, direction, Ithresh, Vmax, sweep,
stabilise_time, init, use_vna, data_dir, comment, **kwargs):
print("===================================")
print("Starting acquisition script...")
vna_string = ''
# initialise instruments
try:
print("----------------------------------------")
print("Setting up Keithley DC sources...")
self.sourceVg = sourceVg = K2400('GPIB::24::INSTR',
sourcemode='v',
vrang=200,
irang=10e-6,
slope=1,
initialise=init)
print("DC sources are set up.")
except:
print("There has been an error setting up DC sources.")
raise
if use_vna:
print("Setting up VNA...")
vna = AnritsuVNA('GPIB::6::INSTR')
sweeptime = vna.get_sweep_time()
if vna.get_sweep_type() != 'FSEGM':
raise Exception('Please use segmented frequency sweep')
# check if the RF power is the same on both ports and for all
# frequency segments
count = int(vna.query(':SENS:FSEGM:COUN?'))
vna_pow = None
for i in range(1, count + 1):
port1pow = float(
vna.query(':SENS:FSEGM{}:POW:PORT1?'.format(i)))
port2pow = float(
vna.query(':SENS:FSEGM{}:POW:PORT2?'.format(i)))
if vna_pow is None and port1pow == port2pow:
vna_pow = port1pow
elif vna_pow is not None and port1pow == port2pow and port1pow == vna_pow:
continue
else:
raise Exception(
"Please select the same power for all ports and frequency segments"
)
port1att = vna.get_source_att(1)
port2att = vna.get_source_att(2)
if port1att == port2att:
vna_pow -= port1att
else:
raise Exception(
"Please select the same attenuators for both ports")
vna_string = '_pwr={:.0f}'.format(vna_pow)
print("VNA is set up.")
# define name
timestamp = time.strftime('%Y-%m-%d_%Hh%Mm%Ss')
filename = timestamp + vna_string + ('_' + comment if comment else '')
# prepare saving RF data
spectra_fol = os.path.join(data_dir, filename)
create_path(spectra_fol)
# prepare saving DC data
self.prepare_saving(os.path.join(data_dir, filename + '.txt'))
if use_vna:
# prepare saving RF data
spectra_fol = os.path.join(data_dir, filename)
create_path(spectra_fol)
# save segmented frequency sweep data to file
with open(os.path.join(spectra_fol, 'VNAconfig'), 'w') as f:
vna.dump_freq_segments(f)
Vg = startpoint
def measure_point(Ithresh=np.inf):
print('Setting Vg=' + str(Vg) + ' V...')
sourceVg.set_voltage(Vg)
print('Stabilising...')
progressbar_wait(stabilise_time)
# measure
Vgm = sourceVg.get_voltage()
Ileak = sourceVg.get_current()
# save data
self.save_row(locals())
# save VNA data
if use_vna:
# save VNA data
print("Getting VNA spectra...")
vna.single_sweep(wait=False)
# display sweep progress
progressbar_wait(sweeptime)
# make sure sweep is really done
while not vna.is_sweep_done():
time.sleep(0.5)
table = vna.get_table([1, 2, 3, 4])
timestamp = time.strftime('%Y-%m-%d_%Hh%Mm%Ss')
spectrum_file = timestamp + '_Vg={:.3f}.txt'.format(Vg)
np.savetxt(os.path.join(spectra_fol, spectrum_file),
np.transpose(table))
return np.abs(Ileak) > Ithresh
# measure at 0 V
measure_point()
# sweep if requested
#╦direction = 1. # up
if direction not in [1., -1.]:
raise Exception("select valid direction 1. or -1.")
back_to_zero = False
decimals = int(max(1., -np.log10(step) + 1.))
while sweep:
if self.flags['quit_requested']:
return locals()
Vg = np.around(Vg + step * direction, decimals)
if np.abs(Vg) > Vmax:
print("Reached maximum voltage! Inverting sweep direction.")
if direction < 0. and Vg < 0.:
back_to_zero = True
direction = -direction
continue
leak = measure_point(Ithresh)
if leak:
if direction * Vg < 0.:
continue
if direction < 0. and Vg < 0.:
back_to_zero = True
direction = -direction
if np.abs(Vg) < 1e-12 and back_to_zero:
break
print("Acquisition done.")
return locals()