A low-power switched-capacitor variable gain amplifier
A low-power switched-capacitor variable gain amplifier
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DOI：
10.1109/jssc.2004.829919
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发表时间：
2004-06
影响因子：
5.4
通讯作者：
Y. Fujimoto;Hitoshi Tani;Masahiko Maruyama;H. Akada;H. Ogawa;M. Miyamoto
中科院分区：
文献类型：
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作者：
Y. Fujimoto;Hitoshi Tani;Masahiko Maruyama;H. Akada;H. Ogawa;M. Miyamoto
提出了一种新的采用两级运算放大器的开关电容放大器(SCA)的功率降低技术。该技术提高了SCA的带宽和转换速率，仅增加了两个开关，从而降低了SCA的功耗。这种功率降低技术应用于可变增益放大器(VGA)，该放大器实现在手机摄像头模块的模拟前端。与传统的VGA相比，VGA的功耗降低了30%。该VGA采用0.25/SPL Mu/m工艺，采用3.3V晶体管和MIM电容，功耗为0.49/SPL倍/0.49 mm/sup 2/，在18 MHz下功耗为18.7 mW，电源电压为3.1V。
A novel power reduction technique is proposed for a switched-capacitor amplifier (SCA) with two-stage operational amplifier. This technique improves both the bandwidth and the slew rate of the SCA with only two additional switches, and therefore, the power consumption of the SCA is reduced. This power reduction technique is applied to a variable gain amplifier (VGA) which is implemented in an analog front-end of camera modules for cellular phones. This reduces 30% of the VGA power consumption compared to the conventional one. Fabricated in 0.25-/spl mu/m CMOS process with 3.3-V transistors and MIM capacitors, the VGA occupies 0.49/spl times/0.49 mm/sup 2/ and dissipates 18.7 mW at 18 MHz with a supply voltage of 3.1 V.