.. include:: /project-links.txt
.. include:: /abbreviation.txt


############
 Time Delay
############

.. getthecode:: time-delay.py
    :language: python3
    :hidden:
    :notebook:

This example shows the simulation of a transmission line.

.. code-block:: py3

    
    
    import matplotlib.pyplot as plt
    
    
    import PySpice.Logging.Logging as Logging
    logger = Logging.setup_logging()
    
    
    from PySpice import Circuit, Simulator, plot
    from PySpice.Unit import *
    
    

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

.. code-block:: py3

    
    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 = Simulator.factory()
    simulation = simulator.simulation(circuit, temperature=25, nominal_temperature=25)
    analysis = simulation.transient(step_time=1e-11, end_time=100e-9)
    
    
    figure, ax = plt.subplots(figsize=(20, 6))
    ax.plot(analysis['input'])
    ax.plot(analysis['output'])
    ax.set_xlabel('Time [s]')
    ax.set_ylabel('Voltage (V)')
    ax.grid()
    ax.legend(['input', 'output'], loc='upper right')
    
    plt.show()
    


.. image:: time-delay.png
    :align: center