Mixer arrangement for suppression of oscillator interference in

Details Mixer arrangement for suppression of oscillator interference in Mixer arrangement for suppression of oscillator interference in

1984-04-30

1989-03-21

Laroche, Eugene R.

Demodulators

Amplitude modulation demodulator

Having specific distortion, noise or other interference...

329124, 329168, H03D 318, H03D 106

Patent

active

048147150

ABSTRACT:
Mixer arrangement (M) comprising first and second quadrature mixer stages (M.sub.1 and M.sub.2) to which quadrature mixing signals are applied from an oscillator circuit (F.sub.0), these two mixer stages (M.sub.1 and M.sub.2) being coupled to a superposition circuit (S.sub.0). To suppress interferences occurring in the output signal of the superposition circuit due to oscillator crosstalk or leakage and/or a d.c. offset of the mixer stages (M.sub.1 and M.sub.2) which are supplied with mixing signals by the oscillator cirucit F.sub.0, the quadrature components of these interferences being in phase with the quadrature mixing signals are measured by means of first and second synchronous detectors (SD.sub.1 resp. SD.sub.2) to which detection carriers are applied in an in-phase or an anti-phase relationship with respect to the quadrature mixing signals. After sign inversion these quadrature components are fed back to the inputs of the two mixer stages (M.sub.1 and M.sub.2), resulting in an interference negative feedback.

REFERENCES:
patent: 3949309 (1976-04-01), Pecar
patent: 4243955 (1981-01-01), Daniel et al.
patent: 4313211 (1982-01-01), Leland
patent: 4501004 (1985-02-01), Yoshida et al.

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