Files for use with the ngspice circuit simulation software
This circuit desciption runs a version of Chua' circuit which shows chaotic behavior.
Circuit description file: chua_circuit_6.sp
This plot generated by ngspice shows two voltages in the circuit in a x-y plot.
The circuit description file was made based on this hand drawn schematic:
The amplifier in the circuit was modelled using a Voltage Dependent Voltage Source (E1), the output voltage is limited as in real world amplifiers using the table option.
The diodes and voltage sources introduce non-linearity which is a essential part of the circuit.
This is a classic ring modulator with 4 diodes. The circuit multiplies two signals creating new sum and difference frequency components at it's output.
Schematic found on wikimedia: https://commons.wikimedia.org/wiki/File:Ring_Modulator.PNG License: https://creativecommons.org/licenses/by-sa/3.0/deed.en Modified by adding node numbers.
Circuit desciption file: ring_mod.sp
In this example inputs to the circuit are signals at 1kHz and 1.2kHz, the output includes components at 2.2kHz (sum) and 200Hz (difference).
Output signal:
Frequency spectrum of output signal:
Input signals:
