Low power highly linear RF downconverter

Details Low power highly linear RF downconverter Low power highly linear RF downconverter

2006-03-17

2009-06-09

Nguyen, Lee (Department: 2618)

Telecommunications

Receiver or analog modulated signal frequency converter

Frequency modifying or conversion

C455S306000, C455S307000

Reexamination Certificate

active

07546110

ABSTRACT:
A technique for downconverting a RF signal comprises an antenna adapted to receive an RF signal; a transconductance amplifier connected to the antenna and adapted to amplify the RF signal; a passive mixer connected to the transconductance amplifier and adapted for current domain mixing of electrical current transferred from the transconductance amplifier; and a load impedance connected to the passive mixer. The load impedance may comprise a parallel combination of a frequency dependent negative resistance component, a capacitor, and a resistor. The load impedance may comprise a pair of complex poles, a pair of imaginary zeros, and a real pole. Voltages at an input and an output of the passive mixer are related such that the input voltage of the passive mixer is an upconverted version of the output voltage of the passive mixer, wherein the input voltage of the passive mixer is at an output of the transconductance amplifier.

REFERENCES:
patent: 2003/0087624 (2003-05-01), Leenaerts
patent: 2005/0107064 (2005-05-01), Ismail
patent: 2006/0068749 (2006-03-01), Ismail et al.
Zhou et al., “A CMOS Passive Mixer With Low Flicker Noise For Low-Power Direct Conversion Receiver,” IEEE Journal of Solid-State Circuits, vol. 40, No. 5, May 2005, pp. 1084-1093.

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