Self-biasing low-phase noise LC oscillator

Details Self-biasing low-phase noise LC oscillator Self-biasing low-phase noise LC oscillator

2007-07-13

2009-08-25

Pascal, Robert (Department: 2817)

Oscillators

With particular source of power or bias voltage

C331S1170FE, C331S167000, C331S183000

Reexamination Certificate

active

07579920

ABSTRACT:
A self-biasing negative transconductance LC oscillator that uses self-biasing circuitry to regulate a current source that feeds negative transconductance circuitry and direct current (DC) bias circuitry to apply a DC bias between control inputs and outputs of the negative transconductance circuitry is disclosed. A current source setpoint is based on the voltage swing of the oscillator, which can then be controlled by the DC power supply that powers the oscillator. In one embodiment of the present invention, the negative transconductance circuitry includes a pair of p-type metal oxide semiconductor (PMOS) cross-coupled field effect transistors (FETs), which have a limit applied to their gate to source voltages. Limiting the gate to source voltages of the FETs limits the percentage of the oscillation cycle that the FETs spend in the triode region and thus reduces the noise contribution of the FETs and allows for less power consumption for a given noise requirement.

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