Voltage controlled oscillator

Details Voltage controlled oscillator Voltage controlled oscillator

2007-11-29

2010-06-15

Pascal, Robert (Department: 2817)

Oscillators

Ring oscillators

C331S183000, C327S261000, C327S266000

Reexamination Certificate

active

07737795

ABSTRACT:
A ring oscillator based voltage controlled oscillator (VCO) is disclosed. The VCO includes a set of delay cells connected to each other in a ring configuration. Each of the delay cells includes a source-coupled input transistor pair, a current-steering transistor pair and a pair of load resistors. The source-coupled input transistor pair receives a pair of differential voltage inputs. The load resistors, which are connected to the source-coupled input transistor pair, provide a pair of differential voltage outputs. The current-steering transistor pair, which is connected to the source-coupled input transistor pair, receives a pair of differential bias voltage inputs. The output frequency of the VCO is directly proportional to the differential bias voltages at the pair of differential bias voltage inputs.

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