Last active
October 23, 2025 04:23
-
-
Save rezamarzban/7361ec66ac228f9af680e7cc98fb68cf to your computer and use it in GitHub Desktop.
This file contains hidden or bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
| * RLC circuit with 50kHz square wave input | |
| V1 1 0 PULSE(0 5 0 10n 10n 10u 20u) | |
| R1 1 2 0.01 | |
| L1 2 3 0.1u | |
| C1 3 0 1n | |
| .tran 10n 2000m 1999.8m | |
| .option numdgt=9 | |
| .save all | |
| .control | |
| run | |
| set filetype=ascii | |
| wrdata sim.csv v(3) | |
| write sim.raw v(3) | |
| set hcopydevtype=postscript | |
| hardcopy sim.eps v(3) | |
| .endc | |
| .end |
This file contains hidden or bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
| import numpy as np | |
| from scipy.integrate import odeint | |
| import matplotlib.pyplot as plt | |
| # Parameters | |
| R = 0.01 | |
| L = 1e-6 | |
| C = 1e-7 | |
| omega = 2 * np.pi * 50e3 | |
| T = 1 / 50e3 # 20 µs period | |
| # State-space function | |
| def rlc(y, t): | |
| i, vc = y | |
| vin = 2.5 + 2.5 * np.sign(np.sin(omega * t)) # Square wave 0-5 V | |
| didt = (vin - R * i - vc) / L | |
| dvcdt = i / C | |
| return [didt, dvcdt] | |
| # Time vector | |
| t_start = 0 | |
| t_end = 2000e-3 | |
| dt = 10e-9 # 10 ns steps | |
| t = np.arange(t_start, t_end, dt) | |
| # Initial conditions (steady-state approx.) | |
| y0 = [0, 2.5] | |
| # Solve ODE | |
| sol = odeint(rlc, y0, t) | |
| # Extract capacitor voltage | |
| vc = sol[:, 1] | |
| # Select time window 1 ms to 1.2 ms | |
| mask = (t >= 1999.8e-3) & (t <= 2000e-3) | |
| t_plot = t[mask] | |
| vc_plot = vc[mask] | |
| # Plot | |
| plt.figure(figsize=(10, 5)) | |
| plt.plot(t_plot * 1e3, vc_plot, color='blue') | |
| plt.title('Capacitor Voltage vc vs Time (1 ms to 1.2 ms)') | |
| plt.xlabel('Time (ms)') | |
| plt.ylabel('Capacitor Voltage vc (V)') | |
| plt.grid(True) | |
| plt.show() |
Sign up for free
to join this conversation on GitHub.
Already have an account?
Sign in to comment