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1Hz to 200 MHz generator

Hi:

I may be asking a tall order here but I need a circuit that will generate clean sinewave frequencies from 1 Hz(or lower) to 200MHz (or higher). I will settle for the 1Hz to 200 MHz range for now. Amplitude would also be variable.

How would i go about it? I'm willing to divide the circuit into 2 parts, a low frequency generator and a high frequency generator if that helps....though a monolithic one is preferable, if available.

Thanks,

David