Adder

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I use an adder circuit to synthesize 1khz, 3khz, and 5khz sine waves into a square wave. Why is there a concave in the middle?

maychang

"I used an adder circuit to synthesize 1khz, 3khz, and 5khz sine waves into a square wave, but there is a concave groove in the middle."

Totally normal.

By adjusting the initial phases of the three signals, it is also possible to obtain a waveform with a “higher middle”.

You might as well use two signals, 1kHz and 3kHz (no need to use 5kHz, it is more troublesome to adjust three signals), with equal amplitude, and change the initial phase of the 3kHz signal to see what changes occur in the synthesized waveform.

maychang

The waveform you used is an odd harmonic, so the synthesized waveform is symmetrical. If it contains even harmonics, the synthesized waveform will be asymmetrical. You can try synthesizing with 1kHz and 2kHz.