摘要
通过加入对电源电压不灵敏的基准源产生偏置电流,采用MOS管产生的电阻和MOS管电容串联的补偿结构,消除补偿电容带来的零点;并在输出端采用电阻反馈,降低了输出电阻,增强了带负载能力。在1.5 V电压下,偏置约为1μA。基于BSM3 0.5μm CMOS工艺,对电路进行了PSPICE仿真。负载为20 pF时,该电路获得了87 dB的开环增益,353 MHz的单位增益带宽,61°的相位裕度和132 dB的共模抑制比,功耗为1.24 mW。
A CMOS current feedback operational amplifier was designed based on a current reference source insensitive to power supply. Resistance feedback was used in the output stage to improve its load driving capability. The frequency response property of the amplifier was improved by using compensation circuit consisting of capacitors and zeroing resistors. Results from PSPICE simulation based on BSM3 0. 5μm CMOS technology show that, when driving a capacitive load of 20 pF, the circuit has an open-loop gain of 87 dB, a unity gain bandwidth of 353 MHz, a phase margin of 61°, and a CMRR of 132 dB, while consuming 1. 24 mW of power from a 1. 5 V supply.
出处
《微电子学》
CAS
CSCD
北大核心
2008年第2期284-288,共5页
Microelectronics
基金
国家自然科学基金资助项目(60572026)
四川省学术与技术带头人培养基金重点资助项目(Q024131103010018)
西南交通大学科技发展基金资助项目(2006A05)
关键词
电流反馈运算放大器
单位增益带宽
CMOS
电流基准源
Current feedback operational amplifier
Unity gain bandwidth
CMOS
Current reference source
