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一种用于高速A/D转换器的全差分、低功耗CMOS运算跨导放大器(OTA)
引用本文:朱臻,王涛,易婷,何捷,洪志良.一种用于高速A/D转换器的全差分、低功耗CMOS运算跨导放大器(OTA)[J].复旦学报(自然科学版),2001,40(1):79-85.
作者姓名:朱臻  王涛  易婷  何捷  洪志良
作者单位:复旦大学 电子工程系,
摘    要:介绍一种全差分、低功耗CMOS运算跨导放大器(OTA)。这种放大器用于10位分辨率、30MHz采样频率的流水线式A/D转换器的采样-保持和级间减法-增益电路中。该放大器由一个折叠-级联OTA和一个共源输出增益级构成,并采用了改进的密勒补偿,以期达到最大的带宽和足够的相位裕度。经过精心设计,该放大器在0.35μmCOMS工艺中带宽为590MHz,开环增益为90dB,功耗为15mW,满足高速A/D转换器要求的所有性能指标。

关 键 词:运算跨导放大器  OTA  流水线  折叠-级联放大器  压摆率
文章编号:0427-7104(2001)01-0079-07

A Full Differential, Low Power Consumption CMOS Operational Transconductance Amplifier(OTA)
ZHU Zhen,WANG Tao,YI Ting,HE Jie,HONG Zhi-liang.A Full Differential, Low Power Consumption CMOS Operational Transconductance Amplifier(OTA)[J].Journal of Fudan University(Natural Science),2001,40(1):79-85.
Authors:ZHU Zhen  WANG Tao  YI Ting  HE Jie  HONG Zhi-liang
Abstract:The design of a full differential CMOS transconductance amplifier is presented . This amplifier is used in the sampling-holding and inter-stage s ubtract-gain circuits of a 10-bit, 30 MHz pipelined A/D converter. The amplifi er presented consists of a folded-cascode input stage followed by a common-sou rce output gain stage. The amplifier is compensated with an advanced Miller comp ensation in order to achieve maximum bandwidth and sufficient phase margin. The elaborate design of the amplifier, results in the performances of 590 MHz bandwi dth, open loop gain 90 dB and power consumption 15 mW for 0.35 μm CMOS. All the performances of the amplifier satisfy the demands of high-speed A/D converter.
Keywords:Operational Transconductance Amplifier(OTA)  pipelined  folded-cascode amplifier  slew-rate
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