Don,
if you have a reference oscillator of the right frequency, what's the
the purpose of trying to pull a CMOS oscillator to the same frequency,
rather than just using the reference frequency?
Please be more specific on whant your requirements are.
Adrian
Don Latham schrieb:
Hello all:
I've developed a need for pulling crystal oscillators built in to pll
circuits. These are cmos, and have the common style oscillator circuit
built in. The crystal is across an inverter in the chip, and there is a
small cap between each end of the crystal and ground.
The chips are pll's in radio transceivers, early at that.
I could carefully remove the crystals and caps, simply driving the
non-inverting input on the chip with the reference, but I would rather
simply tack on a very small cap and "pull" the crystal oscillator with an
external reference signal of the right frequency.
Anyone out there tried this?
Thanks
Don
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