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US 2012/0235759 A1Published application
Voltage controlled oscillator circuits and methods using variable capacitance degeneration for increased tuning range
AssigneeInternational Business Machines Corporation
InventorsUllrich R. Pfeiffer, Brian Welch
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Abstract
Voltage controlled oscillator circuits are provided in which variable capacitance degeneration is employed to provide increased tuning ranges and output amplitudes for VCO circuits for millimeter wave applications.
Claims4
A method for operating a VCO (voltage controlled oscillator), comprising:
- applying a first control voltage to a first control port of the VCO to set an oscillation frequency of the VCO;
- and
- applying a second control voltage to a second control port of the VCO to control variable capacitive degeneration of a VCO core and tune a negative impedance provided by the VCO core,
- wherein the first control voltage is applied to the first control port commonly connected between a first pair of varactors, and the second control voltage is applied to the second control port commonly connected between a second pair of varactors to control the second pair of varactors to provide the variable capacitive degeneration.
1 more element
Dependencies are inferred from the claim text.