Mixer circuits and methods with matched bias currents

Details Mixer circuits and methods with matched bias currents Mixer circuits and methods with matched bias currents

2007-10-30

2007-10-30

Chang, Joseph (Department: 2817)

Telecommunications

Receiver or analog modulated signal frequency converter

Frequency modifying or conversion

C327S359000, C331S037000

Reexamination Certificate

active

11262685

ABSTRACT:
Embodiments of the present invention include circuits and methods for improving the spectral purity of mixer circuits. In one embodiment the present invention includes a mixer circuit including a bias circuit, the bias circuit comprising a first transistor having a gate, a source, and a drain, wherein the drain is coupled to a first input of the mixer circuit, a first sensing circuit coupled to the source of the first transistor, and a first comparison circuit coupled to the first sensing circuit, wherein the first comparison circuit receives a feedback signal from the first sensing circuit and a reference voltage, and in accordance therewith, generates a bias control signal to control the bias at the gate of the first transistor.

REFERENCES:
patent: 2002/0047735 (2002-04-01), Grasset et al.
patent: 2003/0216131 (2003-11-01), Kovacevic et al.
patent: 2004/0192244 (2004-09-01), Tan et al.
patent: 2006/0055461 (2006-03-01), Lee et al.

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