SPICE doesn't have built in signal source with a variable duty cycle.? It is easy to build one with a comparator where one input is a triangular waveform and the other is a control signal that causes the duty cycle to vary.? I have done this with BV source as the comparator.? Search the group files and messages for PWM demo.
Rick
On Saturday, December 7, 2013 6:36 PM, texasham10
wrote:
?
I'm new to ltspice, and am trying to draw and simulate a circuit.
This includes a PWM output and a darlington transistor; I searched the libraries and downloaded a new bjt library, but it doesn't contain a TIP120 I also need a pointer to a "signal generator" square wave with a variable duty cycle.
