CMOS variable gain amplifier for controlling dB linear gain

Details CMOS variable gain amplifier for controlling dB linear gain CMOS variable gain amplifier for controlling dB linear gain

2008-04-15

2008-04-15

Mottola, Steven J. (Department: 2817)

Amplifiers

With semiconductor amplifying device

Including differential amplifier

Reexamination Certificate

active

07358811

ABSTRACT:
Provided is a complementary metal oxide semiconductor variable gain amplifier controlling a dB linear gain and a method of controlling the dB linear gain. The complimentary metal oxide semiconductor variable gain amplifier includes: first through fourth transistors differentially receiving first and second input voltages and amplifying the first and second input voltage using a predetermined gain; fifth and sixth transistors controlling a transconductance according to a control voltage to control the predetermined gain; and first and second resistors generating an output voltage having the predetermined gain according to an output current generated by the fifth and sixth transistors.

REFERENCES:
patent: 6157257 (2000-12-01), Murphy
patent: 1020040050589 (2004-06-01), None
Francesco Carrara, et al. “High-Dynamic-Range Decibel-Linear IF Variable-Gain Amplifier With Temperature Compensation for WCDMA Applications”, pp. 1-289-1292.

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