Mixer with balanced local oscillator signal

Details Mixer with balanced local oscillator signal Mixer with balanced local oscillator signal

2008-01-24

2009-11-10

Le, Dinh T. (Department: 2816)

Miscellaneous active electrical nonlinear devices, circuits, and

Specific input to output function

Combining of plural signals

C327S355000, C455S326000

Reexamination Certificate

active

07616045

ABSTRACT:
A mixer includes a first field effect transistor (FET) having a gate that receives a first signal of a balanced local oscillator (LO) signal, a first source/drain coupled to a ground voltage, and a second source/drain; and a second FET having a gate that receives a second signal of the balanced LO signal, a first source/drain that floats, and a second source/drain connected to the second source/drain of the first FET to form a mixing node, the second signal being out of phase with the first signal. A diplexer is connected between the mixing node and each of a radio frequency (RF) port and an intermediate frequency (IF) port. A first LO leakage caused by the first FET is substantially canceled by a second LO leakage caused by the second FET at the mixing node.

REFERENCES:
patent: 4675911 (1987-06-01), Sokolov et al.
patent: 5039891 (1991-08-01), Wen et al.
patent: 5678225 (1997-10-01), Kobayashi
patent: 5799248 (1998-08-01), Vice
patent: 6064872 (2000-05-01), Vice
patent: 6892062 (2005-05-01), Lee et al.

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