Method and apparatus for cancelling phase noise

Details Method and apparatus for cancelling phase noise Method and apparatus for cancelling phase noise

1996-07-11

1997-08-26

Mis, David

Oscillators

Automatic frequency stabilization using a phase or frequency...

Afc with logic elements

331 9, 331 18, 331 74, 331175, H03B 2800, H03L 700

Patent

active

056614390

ABSTRACT:
A frequency oscillator and a frequency multiplier multiplying the signals from the oscillator contain inherent phase noise. A phase noise canceller removes phase noise, due to both the oscillator and the multiplier, by inserting a delay in one path and comparing phases of the delayed signal and the undelayed signal. This comparison may be either fed back to the tuning port of the oscillator or fed forward to a phase shifter which shakes off the phase noise. The delay may include a delay line, a cavity or any other suitable device which produces a phase shift. The phase noise canceller may also be designed to remove the total phase noise of the system, including additive phase noise from sources other than the oscillator and multiplier. The canceller may be calibrated and may be designed to reduce periodic response thereof.

REFERENCES:
patent: 4890071 (1989-12-01), Curtis
patent: 4918405 (1990-04-01), Herleikson
patent: 4994767 (1991-02-01), Hawkes
patent: 5521557 (1996-05-01), Yamashita et al.

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