Low noise amplifier (LNA) gain switch circuitry

Details Low noise amplifier (LNA) gain switch circuitry Low noise amplifier (LNA) gain switch circuitry

2006-10-10

2006-10-10

Vo, Nguyen T. (Department: 2618)

Telecommunications

Receiver or analog modulated signal frequency converter

Local control of receiver operation

C455S293000, C455S251100, C375S345000, C330S254000

Reexamination Certificate

active

07120411

ABSTRACT:
A circuit is formed to steer current in and out of an inductive load in a manner that enables an amplifier to provide a plurality of gain steps without modifying an LC time constant for the circuit and, therefore, without modifying the tuning or frequency of oscillation for the circuit. A first group of MOSFETs are coupled in parallel and define the circuit current flow. A second group of MOSFETs are coupled in parallel to each other and in series to an impedance device. A third group of MOSFETs coupled to steer current in and out of the impedance device to affect the output signal coupled to one end of the impedance device. The transistors in the second and third groups of MOSFETs are selectively activated to control the amount of current that goes through the impedance device.

REFERENCES:
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patent: 6731171 (2004-05-01), Yamashita
patent: 6753730 (2004-06-01), Yamamoto
patent: 6774300 (2004-08-01), McFarland

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