4.8.1. Astable

astable.pyastable.py
####################################################################################################

import matplotlib.pyplot as plt

####################################################################################################

import PySpice.Logging.Logging as Logging
logger = Logging.setup_logging()

####################################################################################################

from PySpice.Probe.Plot import plot
from PySpice.Spice.Netlist import Circuit
from PySpice.Unit import *

# from OperationalAmplifier import basic_comparator

####################################################################################################

circuit = Circuit('Astable Multivibrator')

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)

figure = plt.figure(1, (20, 10))
plot(analysis.reference)
plot(analysis.comparator)
plot(analysis.output)
plt.tight_layout()
plt.show()
#fig# save_figure(figure, 'astable.png')
import matplotlib.pyplot as plt

import PySpice.Logging.Logging as Logging
logger = Logging.setup_logging()

from PySpice.Probe.Plot import plot
from PySpice.Spice.Netlist import Circuit
from PySpice.Unit import *

# from OperationalAmplifier import basic_comparator

circuit = Circuit('Astable Multivibrator')

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)

figure = plt.figure(1, (20, 10))
plot(analysis.reference)
plot(analysis.comparator)
plot(analysis.output)
plt.tight_layout()
plt.show()
../../_images/astable.png