Title:
OSCILLATOR CIRCUIT HAVING REDUCED PHASE NOISE
Document Type and Number:
WIPO Patent Application WO2002017476
Kind Code:
A9
Abstract:
The present invention, generally speaking, allows for a substantial reduction in oscillator phase noise by modifying the transfer function of a portion of the oscillator, e.g., by adding a zero to the transfer function. Modifying the transfer function reduces the open-loop gain of the oscillator but achieves a desired phase compensation, allowing the oscillator to be operated at the resonance of the resonator instead of aoff resonance. In an exemplary embodiment, the transfer function is modified by choosing a capacitance value such that, instead of operating as a bypass at the frequency of interest, adds a zero to the transfer function of the oscillator and causes a change in frequency characteristics, achieving an increase in the effective Q of the oscillator. This increase in effective Q translates directly into reduced phase noise. Phase noise improvement in the range of 3dB has been demostrated.
Inventors:
LEE JEROLD (US)
Application Number:
PCT/US2001/026508
Publication Date:
February 20, 2003
Filing Date:
August 27, 2001
Export Citation:
Assignee:
TROPIAN INC (US)
LEE JEROLD (US)
LEE JEROLD (US)
International Classes:
H03B5/12; (IPC1-7): H03B51/12
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