Coherent receiver phase and amplitude alignment circuit

Details Coherent receiver phase and amplitude alignment circuit Coherent receiver phase and amplitude alignment circuit

1984-11-13

1986-04-22

Ng, Jin F.

Telecommunications

Receiver or analog modulated signal frequency converter

Measuring or testing of receiver

455265, 455304, 343 177, 375 97, 324 83D, H04B 1700, H04B 116, G01S 740

Patent

active

045847100

ABSTRACT:
A device for aligning the phase and amplitude of a quadrature-detected coent two-channel receiver utilizing a mixer in each channel comprising a circuit for providing a sweep frequency signal to each receiver channel; a circuit for detecting the envelopes of the receiver channels at the outputs of the mixers and determining the voltage difference between the envelopes; and a circuit for controlling the amplitude level in one of the receiver channels in accordance with this voltage difference. Simultaneously, the output signals from the two mixers are added with the resulting sum signal being envelope-detected, and also subtracted from each other with the resulting difference signal being envelope-detected. The sum envelope and the difference envelope are subtracted from each other to generate a control signal for controlling the phase of one of the mixer local oscillator signals to ensure that the mixer local oscillator signals are in phase quadrature.

REFERENCES:
patent: 3263228 (1966-07-01), Abrahams et al.
patent: 3594638 (1971-07-01), Quint
patent: 3669511 (1970-09-01), Motley et al.
patent: 3701948 (1972-10-01), McAuliffe
patent: 3895294 (1975-07-01), Vinding
patent: 4204165 (1980-05-01), Ready
patent: 4285060 (1981-08-01), Cobb et al.
patent: 4479253 (1984-10-01), Daniel, Jr.

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