文章基本信息

标题：Switched-Capacitor Variable Gain Amplifier with Operational Amplifier Preset Technique
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作者：Cho, Young-Kyun ; Jeon, Young-Deuk ; Kwon, Jong-Kee 等
期刊名称：ETRI Journal
印刷版ISSN：1225-6463
电子版ISSN：2233-7326
出版年度：2009
卷号：31
期号：2
页码：234-236
语种：English
出版社：Electronics and Telecommunications Research Institute
摘要：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 CMOS process, the VGA, which consists of three-stages, occupies 0.33 and 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 LSB.
关键词：VGA;op-amp;preset technique;acquisition time