Method and apparatus for automatically balancing a radio-frequen

Details Method and apparatus for automatically balancing a radio-frequen Method and apparatus for automatically balancing a radio-frequen

1997-01-09

1999-01-19

Le, Thanh Cong

Telecommunications

Receiver or analog modulated signal frequency converter

Frequency modifying or conversion

455324, 455304, 455305, 455296, H04B 126, H04B 110

Patent

active

058624660

ABSTRACT:
An automatic balancing circuit for a radio frequency mixer which reduces LO-IF signal leakage, as well as minimizing second order harmonic distortion products is described. The circuit couples to in-phase and out-of-phase signal lines originating from the mixer, and comprises a differential gain network, a differential phase shift network and a combiner. The networks operate under the control of a microprocessor, which adjusts the networks so that the LO leakage signals, when combined, are almost completely eliminated.

REFERENCES:
patent: 4584712 (1986-04-01), Isobe et al.
patent: 4776039 (1988-10-01), Akaiwa
patent: 4864638 (1989-09-01), Zwarts
patent: 5046133 (1991-09-01), Watanabe
patent: 5302914 (1994-04-01), Aratz et al.
patent: 5404589 (1995-04-01), Bijker et al.
patent: 5481389 (1996-01-01), Pidgeon et al.
patent: 5548838 (1996-08-01), Talwar et al.
patent: 5715529 (1998-02-01), Kianush et al.
patent: 5724653 (1998-03-01), Baker et al.

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