Apparatus and method for phase noise and post tuning drift cance

Details Apparatus and method for phase noise and post tuning drift cance Apparatus and method for phase noise and post tuning drift cance

1987-11-09

1990-04-17

Griffin, Robert L.

Telecommunications

Receiver or analog modulated signal frequency converter

Frequency modifying or conversion

455317, 455316, 455310, 455209, H04B 126, H04B 110

Patent

active

049187481

ABSTRACT:
The tuner section of a communications receiver 10 includes a gallium arsenide voltage controlled oscillator 48 for upconverting the received signal in mixer 18. Phase noise and post tuning drift associated with oscillator 48 is impressed onto the signal supplied by a second oscillator network 46. Thus, the outputs of mixers 18 and 78 both contain noise and post tuning drift associated with the gallium arsenide oscillator 48. Mixer 28 is used to substract the noise and drift component on line 30 from that on line 32 to thereby provide an output 14 which is substantially free of the noise and drift associated with the efficient, but noisy gallium arsenide VCO 48.

REFERENCES:
patent: 4340974 (1982-07-01), Cooke et al.
patent: 4553264 (1985-11-01), Hasegawa et al.
patent: 4696056 (1987-09-01), Morita

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