def test_close_values_out_of_range(self):
resistors = get_resistors("E12", ORDERS_RESISTOR)
r0_9 = EngineerNumber(0.9, ONE)
M101 = EngineerNumber(10.1, MEGA)
self.assertIsNone(close_values(r0_9, "down", resistors))
self.assertIsNone(close_values(M101, "up", resistors))
def test_close_values_at_limit(self):
resistors = get_resistors("E12", ORDERS_RESISTOR)
r0_9 = EngineerNumber(0.9, ONE)
M101 = EngineerNumber(10.1, MEGA)
self.assertEqual(EngineerNumber(1), close_values(r0_9, "up", resistors))
self.assertEqual(EngineerNumber("10M"), close_values(M101, "down", resistors))
def test_close_values_same_exponent(self):
k47 = EngineerNumber(47, 3)
k50 = EngineerNumber(50, 3)
k56 = EngineerNumber(56, 3)
resistors = get_resistors("E12", ORDERS_RESISTOR)
self.assertEqual(k56, close_values(k50, "up", resistors))
self.assertEqual(k47, close_values(k50, "down", resistors))
def test_close_values_transfer_next_exponent(self):
resistors = get_resistors("E12", ORDERS_RESISTOR)
r83 = EngineerNumber(8.3, 1)
r100 = EngineerNumber(1.0, 2)
self.assertEqual(r100, close_values(r83, "up", resistors))
k094 = EngineerNumber(0.94, 3)
r820 = EngineerNumber(8.2, 2)
self.assertEqual(r820, close_values(k094, "down", resistors))
def _emitter_common_amplifier(Vcc, ic, hfe, Rc, Re, resistors):
ib = ic / hfe # ?
ie = ic + ib
Vc = Rc * ic # 6
Ve = Re * ie
# 注意
# must be Vc + Ve <= Vcc
if Vc + Ve > Vcc:
# raise ValueError("invalid Vc and Ve combination compare Vcc.")
# print("added(Vc={}, Ve={})={} is greater ghan Vcc={}.".format(Vc, Ve, Vc + Ve, Vcc))
return None
Vce = Vcc - (Vc + Ve) # 7
gain = Vc / Ve
Pce = Vce * ic # 8
# Pce は小さきこと。
# 2SC1815 の場合，
# Pce < 400mW(=PD)
Vb = Ve + 0.6 # 9
Vcb = Vcc - Vb
# hfe = 200 # 10
ibias = 10 * ib # 11
Rb2 = Vb / ibias # 12
Rb1 = Vcb / ibias # 13
Rb2_ = close_values(Rb2, "down", resistors)
Rb1_ = close_values(Rb1, "down", resistors)
Rb2, Rb1 = Rb2_, Rb1_
if (not Rb2) or (not Rb1):
# print("--")
# print("Rb2={}, Rb2_={}".format(Rb2, Rb2_))
# print("Rb1={}, Rb1_={}".format(Rb1, Rb1_))
return None
Radd = Rb1 + Rb2
ibias = Vcc / Radd
kwds = {}
for name in NAMES:
kwds[name] = locals()[name]
eca = EmitterCommonAmp(**kwds)
return eca
def look_for_optimized_gain(gain, ic, Vcc, hfe=200, e_series="E12", orders=ORDERS_RESISTOR):
resistors = get_resistors(e_series, orders)
gain_ = gain
parameters = []
# print("resistors =", resistors)
for Rc in resistors:
d = {}
ie = ic + ic / hfe
Vc = Rc * ic # 6
Re = Rc / gain_
Re_ = close_values(Re, "up", resistors)
if not Re_:
continue
Re = Re_
Ve = Re * ie
# 注意
# must be Vc + Ve <= Vcc
if Vc + Ve > Vcc:
# raise ValueError("invalid Vc and Ve combination compare Vcc.")
# print("added(Vc={}, Ve={})={} is greater ghan Vcc={}.".format(Vc, Ve, Vc + Ve, Vcc))
continue
gain = Vc / Ve
Vce = Vcc - (Vc + Ve) # 7
Pce = Vce * ic # 8
# Pce は小さきこと。
# 2SC1815 の場合，
# Pce < 400mW(=PD)
Vb = Ve + 0.6 # 9
Vcb = Vcc - Vb
# hfe = 200 # 10
ib = ic / hfe # ?
ibias = 10 * ib # 11
Rb2 = Vb / ibias # 12
Rb1 = Vcb / ibias # 13
Rb2_ = close_values(Rb2, "down", resistors)
Rb1_ = close_values(Rb1, "down", resistors)
Rb2, Rb1 = Rb2_, Rb1_
if (not Rb2) or (not Rb1):
# print("--")
# print("Rb2={}, Rb2_={}".format(Rb2, Rb2_))
# print("Rb1={}, Rb1_={}".format(Rb1, Rb1_))
continue
Radd = Rb1 + Rb2
# print("Radd =", Radd)
ibias = Vcc / Radd
kwds = {}
for name in NAMES:
kwds[name] = locals()[name]
eca = EmitterCommonAmp(**kwds)
parameters.append(eca)
parameters.sort(key=lambda parameter: math.fabs(gain_ - parameter.gain))
# print("parameters =")
# print(parameters)
return parameters
def test_close_values_eq_down(self):
resistors = get_resistors("E24", ORDERS_RESISTOR)
k15 = EngineerNumber(15, 3)
self.assertEqual(EngineerNumber(15, 3), close_values(k15, "down", resistors))