8.21.1. Time Delay

• time-delay.py
• time-delay.py

#r# This example shows the simulation of a transmission line.

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import matplotlib.pyplot as plt

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

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

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#r# We will drive the transmission line with a pulse source and use a standard 50 Ω load.

circuit = Circuit('Transmission Line')
circuit.PulseVoltageSource('pulse', 'input', circuit.gnd, 0@u_V, 1@u_V, 1@u_ns, 1@u_us)
circuit.LosslessTransmissionLine('delay', 'output', circuit.gnd, 'input', circuit.gnd,
                                 impedance=50, time_delay=40e-9)
circuit.R('load', 'output', circuit.gnd, 50@u_Ω)

simulator = circuit.simulator(temperature=25, nominal_temperature=25)
analysis = simulator.transient(step_time=1e-11, end_time=100e-9)

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figure = plt.figure(None, (20, 6))
plot(analysis['input'])
plot(analysis['output'])
plt.xlabel('Time [s]')
plt.ylabel('Voltage (V)')
plt.grid()
plt.legend(['input', 'output'], loc='upper right')

plt.show()

#f# save_figure('figure', 'time-delay.png')

This example shows the simulation of a transmission line.

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 *

We will drive the transmission line with a pulse source and use a standard 50 Ω load.

circuit = Circuit('Transmission Line')
circuit.PulseVoltageSource('pulse', 'input', circuit.gnd, 0@u_V, 1@u_V, 1@u_ns, 1@u_us)
circuit.LosslessTransmissionLine('delay', 'output', circuit.gnd, 'input', circuit.gnd,
                                 impedance=50, time_delay=40e-9)
circuit.R('load', 'output', circuit.gnd, 50@u_Ω)

simulator = circuit.simulator(temperature=25, nominal_temperature=25)
analysis = simulator.transient(step_time=1e-11, end_time=100e-9)


figure = plt.figure(None, (20, 6))
plot(analysis['input'])
plot(analysis['output'])
plt.xlabel('Time [s]')
plt.ylabel('Voltage (V)')
plt.grid()
plt.legend(['input', 'output'], loc='upper right')

plt.show()