Method and apparatus for compensation of imbalance in zero-if do

Details Method and apparatus for compensation of imbalance in zero-if do Method and apparatus for compensation of imbalance in zero-if do

1990-11-19

1993-11-16

Eisenzopf, Reinhard J.

Telecommunications

Receiver or analog modulated signal frequency converter

Frequency modifying or conversion

4552391, 4552451, 455305, 455337, 375 98, 375102, H04B 126

Patent

active

052631966

ABSTRACT:
To compensate the audio distortion resulting from amplitude and phase imbalance in the quadrature oscillator (103) and mixers (105, 115) in zero-IF downconverters (203), a balancing action is required. An apparatus for distortion compensation compensates for the amplitude and phase imbalance to reduce audio distortion. This is accomplished by determining (309) two gain values, which are combined (217, 227, 229) with the in-phase and quadrature components of the zero-IF downconverter (203) to compensate for the imbalance.

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patent: 4631489 (1986-12-01), Laird et al.
patent: 4631738 (1986-12-01), Betts et al.
patent: 4677690 (1987-06-01), Reed
patent: 4691377 (1987-09-01), Yoshihara et al.
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patent: 4757502 (1988-07-01), Goldman
patent: 4933986 (1990-06-01), Leitch
patent: 5083304 (1992-01-01), Cahill

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