Quadrature oscillator with simplified amplitude, phase and...

Details Quadrature oscillator with simplified amplitude, phase and... Quadrature oscillator with simplified amplitude, phase and...

2006-02-10

2010-06-22

Pascal, Robert (Department: 2817)

Oscillators

Automatic frequency stabilization using a phase or frequency...

Particular frequency control means

C331S135000, C331S153000

Reexamination Certificate

active

07741920

ABSTRACT:
An oscillator circuit providing quadrature outputs and enabling instantaneous control over phase, frequency and amplitude of the output waveforms is disclosed. In one embodiment, the oscillator circuit comprises an oscillation loop, at least one capacitor switching circuit coupled to the oscillation loop, and a synchronization signal having an output coupled to the at least one capacitor switching circuit. The synchronization signal may be derived internally from the oscillation loop or externally from an external oscillator.

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Verhoeven et al., “Low-noise Oscillators”,Analog Circuit Design, Kluwer Academic Publishers 1996, The Netherlands, pp. 65-85.
Westra et al., “Resonance-mode selection and Crosstalk Elimination Using Resonator-Synchronised Relaxation Oscillators”, ESSCIRC 1998, The Hague, The Netherlands, pp. 88-91.

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