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Registered GAIN CONTROL DEVICE AND AMPLIFIER USING THE SAME
- Inventors
- Kim Yi-Gyeong, Kwon Jong-Kee, Cho Min-Hyung
- Application No.
- 12507701 (2009.07.22)
- Publication No.
- 20100156534 (2010.06.24)
- Registration No.
- 7821341 (2010.10.26)
- Country
- UNITED STATES
- Project Code
- 08MB2800, Development of Analog Circuit Techniques for Mixed SoC based on 45nm CMOS Technology, Kwon Jong-Kee
- 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.