Rick Karlquist wrote:
jimlux wrote:
I'm looking for suggestions on a general circuit that can be used to
receive an external frequency reference (nominally a real clean sine
wave at, say, 10 MHz, although up to 100 MHz is possible) and turn it
into a "real clean" square wave. Galvanic isolation is a plus (a
transformer or capacitor would probably do that).
In the 5071A at 80 MHz, we capacitively coupled a sine wave into
a 74AC series logic gate, that had DC bias resistors to hold
it at half the supply voltage.
that's similar to what Said recommended last year.. he uses a big
resistor from output to input to set the bias, rather than a divider.
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