Yeah, using an integrate-and-dump circuit would be the way I would normally make a sawtooth generator circuit, but it seems they want you to use a summing amplifier on all of the input terms that you are provided. I think the main things you need to get right in your circuit is to scale and offset the output correctly based on the input waveforms.Ravrage said:
So just start with a summing amplifier stage to add up the 4 input waveforms. That will give you an approximation of a sawtooth waveform, but with too large an amplitude and centered at 0V instead of running 0V to 5V as shown in the graph. Then what can you do to offset the output waveform in the positive direction to get closer to the final graph.Ravrage said:
I was confused about the DC sources shown in your schematic. The question looks like it wants you to base the opamp circuit on the "Black Box", which has the 4 sinusoidal input waveforms, and produces something close to the desired sawtooth waveform at its output. Where did the idea of using DC sources in the circuit come from?Ravrage said:
The harmonic amplitudes (relative) are defined by the Fourier expansion equation. You need to adjust the overall gain to get the correct total amplitude, and you need to add in an offset so the waveform has that DC component shown in the graph.Ravrage said:
