Gain control device and amplifier using the same

Details Gain control device and amplifier using the same Gain control device and amplifier using the same

2009-07-22

2010-10-26

Choe, Henry K (Department: 2817)

Amplifiers

With semiconductor amplifying device

Including gain control means

C330S254000

Reexamination Certificate

active

07821341

ABSTRACT:
Provided are a gain control device and an amplifier using the gain control device. The gain control device includes a first input resistance unit having a first variable resistor whose resistance is linearly variable and a first fixed resistor respectively receiving a first input signal and a second input signal having a sign different from the first input signal and outputting current through a first output terminal, and a second input resistance unit having a second fixed resistor and a second variable resistor whose resistance is linearly variable respectively receiving the first input signal and the second input signal and outputting current through a second output terminal.Since the gain control device can separately perform dB-linear gain control, it is easily combined with a circuit, such as a continuous-time sigma-delta modulator (SDM), a continuous-time filter, and a continuous-time analog-to-digital converter (ADC), and enables miniaturization and low power consumption.

REFERENCES:
patent: 5999052 (1999-12-01), Tang
patent: 6462615 (2002-10-01), Tanghe
patent: 7102441 (2006-09-01), Lee et al.
patent: 7339434 (2008-03-01), Shirvani-Mahdavi et al.
patent: 7352238 (2008-04-01), Elwan et al.
patent: 7619472 (2009-11-01), Tekin et al.
patent: 2007-067541 (2007-03-01), None
patent: 1020060091991 (2006-08-01), None

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