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학술지 Switched-Capacitor Variable Gain Amplifier with Operational Amplifier Preset Technique
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저자
조영균, 전영득, 권종기
발행일
200904
출처
ETRI Journal, v.31 no.2, pp.234-236
ISSN
1225-6463
출판사
한국전자통신연구원 (ETRI)
DOI
https://dx.doi.org/10.4218/etrij.09.0208.0288
협약과제
08MB1800, 유비쿼터스 단말용 부품 모듈, 김종대
초록
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.
키워드
Acquisition time, Op-amp, Preset technique, VGA
KSP 제안 키워드
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