Phase difference and amplitude correction circuit

Details Phase difference and amplitude correction circuit Phase difference and amplitude correction circuit

1994-09-30

1997-06-03

Mis, David

Oscillators

Polyphase output

331 36C, 331 46, 331 74, 331177V, 327236, 327255, H03B 2700, H03B 512, H03L 7085, H03L 7099

Patent

active

056358768

ABSTRACT:
The correction circuit comprises a first quadrature phase comparator intended to receive as input two signals which are desired to be in quadrature and to have equal amplitudes. Phase adjustment means are firstly intended to correct the phase of at least one of the signal to re-establish a phase difference of 90.degree. therebetween. The correction circuit further comprises means to effectuate the sum and the difference of the signals which it receives as input and to supply the sum and the difference to a second quadrature phase comparator intended to supply as output a second error signal representative of the difference of the effective phase shift of these calculated signals and 90.degree.. The second error signal is finally supplied to amplitude adjustment means intended to correct the amplitude of at least one of said signals.

REFERENCES:
patent: 4795922 (1989-01-01), Rice et al.
patent: 5124656 (1992-06-01), Yassa et al.
patent: 5150128 (1992-09-01), Kongelbeck
patent: 5179731 (1993-01-01), Trankle et al.
Patent Abstracts of Japan, vol. 4, No. 32 (E-2)(514) Mar. 19, 1980 & JP-A-55 004 134 (Matsushita Denki Sangyo KK) Jan. 12, 1990.
Patent Abstracts of Japan, vol. 17, No. 542 (E-1441) Sep. 29, 1993 & JP-A-05 152 855 (Fujitsu Ten Limited) Jun. 18, 1993.

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