This is my first attempt to simulate a circuit in the time domain with CircuitLab. In order to ask a proper question about something similar driven with PWM, I'd like to add an adjustable duty cycle to the square wave, and then if possible ramp it.
How can I add variable duty cycle PWM to a CircuitLab simulation within a question?
simulate this circuit – Schematic created using CircuitLab
This is an interesting question. I've never had to do it but this might work for you.
simulate this circuit – Schematic created using CircuitLab
Figure 1. Two sawtooth oscillators and a comparator.
Figure 2. Note the DC offset in the sawtooth configuration.
Figure 3. The result.
I seem to have configured the amplitude incorrectly on the triangle waves. They should probably be 2.5 V with 2.5 V offset but perhaps the graph is clearer like this.
