Merged high pass filtering and down-converting mixer circuit

Details Merged high pass filtering and down-converting mixer circuit Merged high pass filtering and down-converting mixer circuit

2011-03-15

2011-03-15

Jackson, Blane J (Department: 2618)

Telecommunications

Receiver or analog modulated signal frequency converter

Frequency modifying or conversion

Reexamination Certificate

active

07907927

ABSTRACT:
According to one exemplary embodiment, a mixer circuit comprises first and second switching branches driven by a local oscillator and an input radio frequency (RF) signal. The mixer circuit further comprises at least one capacitor coupled between the first and second switching branches for high-pass filtering of a down-converted output signal of the mixer circuit. In one embodiment, each switching branch comprises a respective mixer transistor, for example, a field effect transistor (FET). In one embodiment, the mixer circuit includes an inductor to reduce or eliminate the effects of parasitic capacitors at a resonance frequency selected to approximately match a desired RF signal frequency. In one embodiment, an inductor at resonance with parasitic capacitors produces a band pass filter for an input RF signal.

REFERENCES:
patent: 5678224 (1997-10-01), Murtojarvi
patent: 6157822 (2000-12-01), Bastani et al.
patent: 6404263 (2002-06-01), Wang
patent: 6472925 (2002-10-01), Komurasaki et al.
patent: 7088169 (2006-08-01), Erba et al.
patent: 7088982 (2006-08-01), Chien
patent: 7289783 (2007-10-01), Rostami et al.
patent: 7509111 (2009-03-01), Langenberg et al.

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