Skipp wrote:
The GPSDO I recently acquired outputs a 10 MHz square wave. I'd like to convert it to a sine wave and I am looking for suggestions
A simple Tee network works well (see below). The input resistor can be chosen from 50 to around 200 ohms to suit the particular output circuit used in your unit. As the value is reduced, the sine wave output will increase (until you hit the current limit of the GPSDO output stage). Use the lowest value that still gives good distortion performance. If the sinewave output amplitude is too large, increase the input resistor.
If the sinewave output amplitude is too small, you can either add a linear amplifier after the filter, or run the square wave from the GPSDO into several high-current CMOS gates in parallel and then through the Tee network (in that case, you would use one input resistor from each of the output gates rather than tie the gate outputs directly to each other).
Best regards, Charles
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