[sdiy] crystal bandpass filter / amplifier with CD4049UBC

[Scott Gravenhorst]

Paul Perry <pfperry at melbpc.org.au> wrote:
>At 12:03 AM 14/05/03 +0200, Magnus Danielson  wrote:
>
>>But, but, but... this sounds like the arch-definition of applications where you
>>really, really, _REALLY_ should turn to analog PLLs. 
>..absolutely true!!
>
>
>>The phasedetector of choice would be a 4-quadrant
>>multiplier and a 1495 should work really well (this is what it was designed to
>>do and not the LF stuff),
>..I'm not a RF kind of guy, but surely a specifically designed PLL chip would
>be better? A 4046 or one of the Philips ones?

Unfortunately, the 4046 PLL's VCO is spec'd at a maximum of 1.6 megaHertz.  I
believe the application was for 10 MHz.  I found no toggle freq. spec for the
phase comparators, so it's hard to say if a 4046 can be used with a subsitute
VCO.  I think the phase comparators like to have a pretty big input signal.

>paul perry Melbourne Australia

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