Low noise mixer circuit with improved gain

Details Low noise mixer circuit with improved gain Low noise mixer circuit with improved gain

2005-09-20

2005-09-20

Gelin, Jean (Department: 2681)

Telecommunications

Receiver or analog modulated signal frequency converter

Frequency modifying or conversion

C455S326000, C455S066100, C455S296000, C455S323000, C455S330000, C455S341000, C455S343100, C455S355000, C330S051000, C330S253000, C330S254000

Reexamination Certificate

active

06947720

ABSTRACT:
A mixer circuit of the present invention includes a gain stage configured to receive a first signal and a modulated bias current, and in accordance therewith, produce an output signal, the gain stage generating a first current and receiving the modulated bias current from a bias circuit on a common node. The bias circuit includes an input configured to receive a second signal, and in accordance therewith, generate the modulated bias current. The mixer circuit also includes a current shunt circuit for generating a second current. The first current, the second current, and the modulated bias current are coupled to the common node. In one embodiment, the first signal is approximately a square wave, and the frequency of the first signal is one-third the frequency of the second signal.

REFERENCES:
patent: 4480337 (1984-10-01), Graziadei et al.
patent: 6057714 (2000-05-01), Andrys et al.
patent: 6175274 (2001-01-01), Groe
patent: 6738601 (2004-05-01), Rofougaran et al.

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