RF front-end circuitry with reduced DC offset

Details RF front-end circuitry with reduced DC offset RF front-end circuitry with reduced DC offset

2007-07-17

2009-08-18

Tarcza, Thomas H (Department: 3662)

Communications: directive radio wave systems and devices (e.g.,

With particular circuit

C342S021000, C331S105000

Reexamination Certificate

active

07576687

ABSTRACT:
An RF front-end circuit includes a directional coupler, a mixer, and a reflection circuit. The directional coupler is adapted to receive an antenna signal and an oscillator signal. The mixer is coupled to the directional coupler to receive the antenna signal and is further adapted to receive a mixer signal and to generate an output signal related to the antenna signal and the mixer signal. The reflection circuit is coupled to the directional coupler to receive the oscillator signal and is adapted to reflect at least a portion of the oscillator signal to the mixer via the directional coupler to counteract a parasitic portion of the oscillator signal received at the mixer.

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patent: 2004/0123667 (2004-07-01), McGrath
patent: 2008/0278370 (2008-11-01), Lachner et al.

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