Voltage controlled oscillator
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United States of America Patent
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Jun 15, 2010
Grant Date -
Jun 5, 2008
app pub date -
Nov 29, 2007
filing date -
Nov 30, 2006
priority date (Note) -
Expired
status (Latency Note)
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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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