def test_spinit(self):
from PySpice.Spice.Netlist import Circuit
import PySpice.Unit as U
circuit = Circuit('Astable Multivibrator')
source = circuit.V('cc', 'vcc', circuit.gnd, 15 @ U.u_V)
circuit.R(1, 'output', 'comparator', 1 @ U.u_kΩ)
circuit.C(1, 'comparator', circuit.gnd, 100 @ U.u_nF)
circuit.R(2, 'output', 'reference', 100 @ U.u_kΩ)
circuit.R(3, 'vcc', 'reference', 100 @ U.u_kΩ)
circuit.R(4, 'reference', circuit.gnd, 100 @ U.u_kΩ)
circuit.NonLinearVoltageSource(1,
'output',
circuit.gnd,
expression='V(reference, comparator)',
table=((-U.micro(1), 0),
(U.micro(1), source.dc_value)))
simulator = circuit.simulator(temperature=25, nominal_temperature=25)
simulator.initial_condition(
comparator=0) # Fixme: simulator.nodes.comparator == 0
analysis = simulator.transient(step_time=1 @ U.u_us,
end_time=500 @ U.u_us)
if (len(analysis.output)) < 500:
raise NameError('Simualtion failed')
source = circuit.V('cc', 'vcc', circuit.gnd, 15 @ u_V)
# Time constant
circuit.R(1, 'output', 'comparator', 1 @ u_kΩ)
circuit.C(1, 'comparator', circuit.gnd, 100 @ u_nF)
# Reference
circuit.R(2, 'output', 'reference', 100 @ u_kΩ)
circuit.R(3, 'vcc', 'reference', 100 @ u_kΩ)
circuit.R(4, 'reference', circuit.gnd, 100 @ u_kΩ)
# Comparator
# Fixme: ngspice is buggy with such subcircuit
# circuit.subcircuit(basic_comparator)
# circuit.X('comparator', 'BasicComparator', 'reference', 'comparator', 'vcc', circuit.gnd, 'output')
circuit.NonLinearVoltageSource(1,
'output',
circuit.gnd,
expression='V(reference, comparator)',
table=((-micro(1), 0), (micro(1),
source.dc_value)))
simulator = circuit.simulator(temperature=25, nominal_temperature=25)
simulator.initial_condition(
comparator=0) # Fixme: simulator.nodes.comparator == 0
analysis = simulator.transient(step_time=1 @ u_us, end_time=500 @ u_us)
# Fixme: Xyce fails with Time step too small
figure, ax = plt.subplots(figsize=(20, 10))
ax.grid()
ax.plot(analysis.reference)
ax.plot(analysis.comparator)
ax.plot(analysis.output)
