Variable gain amplifier

Details Variable gain amplifier Variable gain amplifier

2008-03-25

2008-03-25

Lee, Benny (Department: 2817)

Amplifiers

With semiconductor amplifying device

Including differential amplifier

C330S285000

Reexamination Certificate

active

11497461

ABSTRACT:
A complementary metal oxide semiconductor (CMOS) variable gain amplifier has a wider decibel-linear gain variation characteristic with respect to a control voltage when a signal is amplified. The variable gain amplifier includes: a bias input circuit for supplying a current corresponding to a bias voltage; an operation region combination and feedback circuit connected to the bias input circuit and combining at least two amplifiers by feedback in response to a control voltage, each amplifier having a decibel-linear characteristic in saturation and triode regions of a complementary metal oxide semiconductor (CMOS); and a bias output circuit connected to the bias input circuit, and outputting bias current controlled by the operation region combination and feedback circuit.

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‘A Low-Voltage Low-Power Wide-Range CMOS Variable Gain Amplifier’ Motamed et al., IEEE Transactions on Circuits and Systems II: Analog and Digital Signal Processing, vol. 45, No. 7, Jul. 1998, pp. 800-811.
‘A CMOS IF Transceiver with 90 dB Linear Control VGA for IMT-2000 Application’ Youn et al., 2003 Symposium on VLSI Circuit Digest of Technical Papers, pp. 131-134.
‘CMOS current-mode pseudo-exponential function circuit’ Vlassis, Electronic Letters, Apr. 12, 2001, vol. 37, No. 8, pp. 471-472.

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