Correcting circuit for mixing circuit receiver using same and fr

Details Correcting circuit for mixing circuit receiver using same and fr Correcting circuit for mixing circuit receiver using same and fr

1994-10-07

1996-12-10

Eisenzopf, Reinhard J.

Telecommunications

Receiver or analog modulated signal frequency converter

Noise or interference elimination

455114, 455118, 455310, 332123, H04B 104, H04B 110

Patent

active

055840663

ABSTRACT:
A double superheterodyne receiver comprising a pair of first mixer circuits, a pair of second mixer circuits, a demodulator circuit, and a pair of detector circuits. The first mixer circuits are connected in an orthogonal relation to each other and acts to convert a received RF signal into a pair of first intermediate-frequency (IF) signals in the baseband. The second mixer circuits are connected in an orthogonal relation to each other and acts to convert the first IF signals into a pair of second IF signals of a given center frequency. The demodulator circuit arithmetically combines the second IF signals so as to create a third IF signal, and demodulates the original signal from the third IF signal. The output signals from the second mixer circuits are supplied to the detector circuits, which in turn detect the carrier component contained in the output signals. The output signals from the detector circuits are fed to the second mixer circuits. The DC balance between the second mixer circuits is so corrected that the leaking carrier components are reduced.

REFERENCES:
patent: 4121161 (1978-10-01), Ohsawa
patent: 4355414 (1982-10-01), Inoue
patent: 4811425 (1989-03-01), Feerst
patent: 5001776 (1991-03-01), Clark
patent: 5012208 (1991-04-01), Makinen et al.
patent: 5283532 (1994-02-01), Burkhart et al.
patent: 5396196 (1995-03-01), Blodgett

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