Low phase noise reference oscillator
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United States of America Patent
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Aug 23, 1994
Grant Date -
N/A
app pub date -
Jul 14, 1993
filing date -
Jul 14, 1993
priority date (Note) -
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Abstract
A phase-locking oscillator circuit having improved phase noise characteristics is disclosed herein. The oscillator circuit includes a tuned oscillator for providing a carrier signal at a tunable carrier frequency. The carrier signal is applied to an input port of a phase modulator operative to impress an RF signal upon output terminal. An error detection and feedback network generates an error signal by comparing a predefined characteristic of the RF output signal to a reference signal. The network includes a loop filter arrangement which operates upon the error signal so as to provide a tuned oscillator tuning signal to a tuning port of the tuned oscillator and a modulator control signal to a control port of the phase modulator. In an exemplary implementation the error detection and feedback network includes a phase detector for generating the error signal in response to the phase difference between the RF output signal and the reference signal.
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