Stephane wrote:
I need to make a squarer. I was hesitating between several methods : using a CMOS gate, but this will increase the flicker noise from what I've read, using an amplifier and clamping diodes or a fast comparator which might create some noise around the trigger point... Any recommendation there ?
The basic Wenzel design can be optimized with attention to a few details (see below).
Note that bias must be supplied to the LM329 (or whatever reference you use for the bases), which is not shown. The 20v supply should be quiet. The 1k emitter resistors can be replaced with quiet current sources, if you want to go to the trouble -- but with a quiet 20v supply, that should not be necessary (and designing quiet current sources is its own challenge).
I posted a variant of this circuit for 3v logic on 12/25/14, which you can find in the archive. The power supply decoupling shown in that version (100uF tantalum + 1uF X7R ceramic + 10nF C0G or X7R ceramic) is superior to what is shown below).
Best regards, Charles
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