Low noise mixer with reduced distortion

Details Low noise mixer with reduced distortion Low noise mixer with reduced distortion

2006-09-13

2008-11-04

Le, Dinh T. (Department: 2816)

Miscellaneous active electrical nonlinear devices, circuits, and

Specific input to output function

Combining of plural signals

C327S357000, C455S326000, C455S333000

Reexamination Certificate

active

07446590

ABSTRACT:
A low noise RF mixer is described. The mixer of the present invention has excellent linearity due to reduction of second-order distortion. The mixer includes an inputting stage, a switching stage and a load stage. The inputting stage includes a switching pair and a transconductance circuit. The load stage is formed by resistors. The switching stage includes a switch quad (two switch pairs). Each switch pair of the switching stage has a current source for implementation of current injection to a common source (emitter) junction of the switch pair. For each switch pair of the switching stage, an inductor is connected between the current source and the common source (emitter) junction. In addition, a capacitor is connected with the inductor.

REFERENCES:
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patent: 6026286 (2000-02-01), Long
patent: 6057714 (2000-05-01), Andrys et al.
patent: 6922108 (2005-07-01), Lin
Massimo Brandolini, Paolo Rossi, Davide Sanzogni, “A CMOS Direct Down-Converter with +78dBm Minimum IIP2 for 3G Cell-Phones” in IEEE ISSCC Digest of Technical Papers, Feb. 2005, pp. 320-321, 601.
Danilo Manstretta, Massimo Brandolini, Franceso Svelto, “Second-Order Intermodulation Mechanisms in CMOS Downconverters” in IEEE Journal of Solid-State Circuits, Mar. 2003, pp. 394-406, vol. 38, No. 3.

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