Mixer device with image frequency rejection

Details Mixer device with image frequency rejection Mixer device with image frequency rejection

1996-12-11

1999-05-04

Vo, Nguyen

Telecommunications

Receiver or analog modulated signal frequency converter

Noise or interference elimination

455304, 455306, 455324, 455285, H04B 130

Patent

active

059013494

ABSTRACT:
The device forms first and second signals by mixing the input radio signal with two respective quadrature waves of frequency f.sub.O. An algebraic sum of these two signals is phase-shifted by .+-.45.degree. or .+-.135.degree. at an intermediate frequency f.sub.I. An output signal is formed by an algebraic sum between the phase-shifted signal and the first or second signal, in such a way that, at the intermediate frequency f.sub.I, the output signal has a phase representative of that possessed by the input radio signal at a communication frequency f.sub.C of the form f.sub.O -f.sub.I or f.sub.O +f.sub.I, with rejection of the phase of the input radio signal at the image frequency 2f.sub.O -f.sub.C.

REFERENCES:
patent: 4696055 (1987-09-01), Marshall
patent: 4696113 (1987-09-01), Rother et al.
patent: 4910800 (1990-03-01), Chung
patent: 4955039 (1990-09-01), Rother et al.
patent: 5179731 (1993-01-01), Trankle et al.
patent: 5212825 (1993-05-01), Layton

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