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US 4,884,041 AGranted
Fully integrated high-speed voltage controlled ring oscillator
AssigneeHewlett-Packard Company
InventorRichard C. Walker
Life of this patent
Estimating the term…
Abstract
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.
Claims1
A ring oscillator comprising:
- an inverter/combination element having a pair of inputs and an output;
- a first delay element having an input connected to the output of the inverter/combination element and having an output;
- a second delay element having an input connected to the output of the first delay element and having an output connected to a first one of the inputs of the inverter/conbination element;
- a third delay element having an input connected to the output of the first delay element and having an output connected to a second of the inputs of the inverter/conbination element;
- and
- an output port connected to any internal connection between the other elements of this oscillator.
3 more elements
Dependencies are inferred from the claim text.