Re: voltage control oscillator

"javvad" <joji115@xxxxxxxxx> wrote in message
news:ff43c542-3458-4c33-bc1e-b45fdd4490c8@xxxxxxxxxxxxxxxxxxxxxxxxxxxxxx
i want do design voltage control oscillator which have carrier
frequency 137MHZ and frequency deviation 40MHZ means want to design fm
modulator have these .thanks

Plastonek's "RF Oscillator Circuit Analysis and Design with Breadboard
Experiments" has something very similar to this, but it's probably impossible
to get ahold of anymore. Wes Hayward's "Introduction to Radio Frequency
Design" has enough information to get you going as well...

A 40MHz deviation on a 137MHz carrier is huge, though -- do you really need
it? I don't think there's any reasonably simple way to get such a huge
deciation using "simple" VCOs... you'd be much better off getting 40MHz
deviation at, e.g., 800MHz and then mixing the result down to a center of
137MHz.


.

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