摘要
基于0.35μm CMOS工艺设计了一种轨到轨输入输出可变增益放大器,采用可变电阻网络实现0~32倍可调增益,基于亚阈值区的恒定跨导互补输入对实现轨到轨共模输入,增益自举共源共栅中间级保证高增益,Class-AB输出级实现轨到轨输出,并且采用斩波降低运算放大器失调噪声、1/f噪声。基于Spectre软件进行了仿真,并进行了版图设计,仿真结果表明,在单位增益下,1 Hz到100 kHz的等效输入噪声为67.7 nV@10 Hz,内部放大器Δg_(m)<3.13%,THD在V_(pp)输入电压下达到-127 dB。
In this study,we designed a rail-to-rail input-output progammable gain amplifier(PGA)based on the 0.35μm CMOS process.It employs a variable resistor network to achieve adjustable gains ranging from 0 to 32.The rail-to-rail common-mode input is achieved by using a constant transconductance complementary input pair in the subthreshold region.We can ensure high gain by implementing a gain-boosted cascode intermediate stage.A Class-AB output stage enables rail-to-rail output,and chopper stabilization is used to reduce the operational amplifier offset and 1/f noise.We performed simulations using Spectre along with the layout design.The simulation results indicate that,at a gain of 1,the equivalent input noise from 1 Hz to 100 kHz is 67.7 nV@10 Hz,internal amplifier g_(m)<3.13%,and THD is−127 dB under the input voltage,V_(pp).
作者
赵之昱
王妍
廖轰
雷生吉
杨曼琳
杨潇雨
ZHAO Zhiyu;WANG Yan;LIAO Hong;LEI Shengji;YANG Manlin;YANG Xiaoyu(National Key Laboratory of Integrated Circuits and Microsystem,Chongqing 400060,P.R.China;The 24th Research Institute of China Electronics Technology Group Corporation,Chongqing 400060,P.R.China)
出处
《微电子学》
北大核心
2025年第2期251-255,共5页
Microelectronics
基金
集成电路与微系统全国重点实验室基金项目(2022-JCJQ-LB-049-5)。
关键词
可变增益放大器
轨到轨
恒定跨导
低噪声
高线性度
programmable gain amplifier
rail to rail
constant gm
low noise
high linearity
