Active filtering mixer

Details Active filtering mixer Active filtering mixer

1990-12-03

1992-11-03

Kuntz, Curtis

Telecommunications

Receiver or analog modulated signal frequency converter

Noise or interference elimination

455114, 455310, H04B 110

Patent

active

051612542

ABSTRACT:
An active filtering mixer has a feedback arrangement, by means of which unwanted components in the output of the mixer are fed back, out of phase, to an input of the mixer for substantially canceling such components dynamically within the mixer, itself. In so doing, active filtering mixers in accordance with the invention largely avoid the undesirable effects these components can have on signal processing in downstream devices, and within the mixer. The feedback arrangement also stabilizes the mixer's DC operating point, and thereby can maintain the maximum dynamic range of the mixer. Preferably, the desired components of the output are also fed back, but to a substantially smaller degree than the unwanted components, thereby linearizing the in-band output of the mixer, and generallly improving the mixer's performance over the entire spectrum of its output.

REFERENCES:
patent: 3939430 (1976-02-01), Dickens et al.
patent: 4177430 (1979-12-01), Paul
patent: 4320523 (1982-03-01), Horikawa et al.
patent: 4408352 (1983-10-01), Dudding
patent: 5020148 (1991-05-01), Bonato

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