Not a good idea to use a bandpass filter even a crystal filter as such a filter
has a relatively large phase shift tempco.The flicker phase noise of the filter
crystal will degrade the output signal flicker phase noise
significantly.Another issue is that the maximum crystal current will limit the
maximum signal input to the crystal filter and thus degrade the output phase
noise floor over that achievable using other approaches.
Bruce
On Wednesday, 28 January 2015 11:19 PM, Alberto di Bene <[email protected]>
wrote:
On 1/27/2015 11:57 PM, Bruce Griffiths wrote:
> /The only viable solution is to use better filtering of the output of a
> switching multiplier./
What about filtering the doubler output with a 10 MHz xtal ?
73 Alberto I2PHD
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