BROWSE
Detail
Journal Article
Switched-Capacitor Variable Gain Amplifier with Operational Amplifier Preset Technique
- Authors
- Young Kyun Cho, Young Deuk Jeon, Jong Kee Kwon
- Issue Date
- 2009-04
- Citation
- ETRI Journal, v.31, no.2, pp.234-236
- ISSN
- 1225-6463
- Publisher
- 한국전자통신연구원 (ETRI)
- Language
- English
- Type
- Journal Article
- Abstract
- We present a novel operational amplifier preset technique for a switched-capacitor circuit to reduce the acquisition time by improving the slewing. The acquisition time of a variable gain amplifier (VGA) using the proposed technique is reduced by 30% compared with a conventional one; therefore, the power consumption of the VGA is decreased. For additional power reduction, a programmable capacitor array scheme is used in the VGA. In the 0.13 μm CMOS process, the VGA, which consists of three-stages, occupies 0.33 mm2and dissipates 19.2 mW at 60 MHz with a supply voltage of 1.2 V. The gain range is 36.03 dB, which is controlled by a 10-bit control word with a gain error of 짹0.68 LSB. © 2009 ETRI.
- KSP Keywords
- CMOS Process, Capacitor array, Operational Amplifiers(Op-Amps), Power Consumption, Supply voltage, Switched Capacitor(SC), Variable Gain Amplifier(VGA), acquisition time, gain range, power reduction, programmable capacitor