Reducing active mixer flicker noise

Details Reducing active mixer flicker noise Reducing active mixer flicker noise

2005-05-03

2005-05-03

Tran, Pablo N. (Department: 2685)

Telecommunications

Receiver or analog modulated signal frequency converter

Frequency modifying or conversion

C455S293000, C455S326000, C455S333000, C327S116000, C327S386000, C330S254000

Reexamination Certificate

active

06889037

ABSTRACT:
A mixer is disclosed that includes first and second transconductance modules that, in one embodiment, includes MOSFETs configured to receive a plurality of signals that are to be mixed and a selectively coupled auxiliary current source to inject an auxiliary current into the second transconductance module approximately at or near a zero-crossing point in order to reduce flicker noise and other noise introduced into an output signal during switching. Accordingly, as a first transconductance module approaches a zero-crossing, auxiliary current is injected to reduce the current produced therefrom thereby reducing flicker noise. In a differential mixer, the amount of current produced from a transistor pair to which the signal cycle is being switched is also reduced thereby reducing noise from the transistor pair that is turning on for the next portion of a signal cycle.

REFERENCES:
patent: 6184739 (2001-02-01), Doyle
patent: 6525609 (2003-02-01), Behzad
patent: 6684065 (2004-01-01), Bult et al.
patent: 6759904 (2004-07-01), Behzad
patent: 20020004376 (2002-01-01), Lee et al.
patent: 20040227559 (2004-11-01), Erba et al.

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