Fully integrated high-speed voltage controlled ring oscillator
 An N ring element ring oscillator merged with an M element ring oscillator by using a linear combining circuit. By adjusting the control voltage, the oscillation frequency can be varied from 1/2*N*T.sub.d (where T.sub.d is a gate delay) to 1/2*M*T.sub.d. Other embodiments provide extended frequency tuning range. 
Hewlett-Packard Company
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Richard C.
Walker