I need to convert a sine wave to a square wave with the following restrictions:

• Frequency can range from around 50hz to 1khz
• Waveform can be either of the attached scope readings. The first is easy: around 15v peak to peak, all above 0vdc, almost square already. The second is the harder one as it is under 5v peak to peak with a wandering offset.
• Square wave output should be 50% duty cycle, 0-3.3vdc suitable for input to a microprocessor.

Should I do something like a variable gain amplifier feeding into an opamp / comparator circuit? Zeiner diodes? A fancy IC?


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You'll have to be a bit more specific. Also, please post a schematic.

 

Seems like AC couple into a comparator would handle both offset and wandering
offset. Reference for comparator 0V.

Additional info of course is needed -

1) Jitter requirement
2) Wander characteristics, like frequency, amplitude
3) Latency to a step change in wander

Regards, Dana.