payam said:
does a prescaler( mb509 or m54456) input should be squre wave or it
can be sine wave too?
any help?
You should be asking the vendor this question.
My experience (but not with these chips) has been
that slew rate is what matters. At high frequencies,
there ain't much difference between sine and square
and you probably can't (easily) generate a higher slew rate
anyway.
The problem is at low frequencies where the sine wave
slew rate is too low. You spend too much time near the
threshold and you get noise, oscillations, etc.
You put a schmitt trigger in the input to fix that, but you
find that the delay thru the schmitt feedback puts
holes in your frequency response. CATCH 22.
One technique is to use a one-port
device like a tunnel diode. But I'd be shot by the group
members if I suggested that.
If you'd said a little about what frequencies and amplitudes
that interest you, I could have wasted less bandwidth.
mike
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