期刊论文

中文

电子元件与材料

1001-2028

2022

41

4

412-417

10.14106/j.cnki.1001-2028.2022.1287

本校为第一机构

针对斩波调制导致的输出纹波和带宽受限的问题, 采用复合路径结构, 将运放分为高频低增益的主路径和低频高增益的辅助路径, 主路径决定带宽, 辅助路径决定失调, 斩波调制位于辅助路径, 解除了带宽限制;将Pingpong自动调零与斩波调制相结合, 减小了运放的失调和斩波调制导致的纹波;采用复合路径混合嵌套米勒补偿的方法来进行频率补偿, 保证了多级运放的稳定性。低失调运放的设计基于华虹宏力(GSMC)0.13 μm CMOS工艺, 经Spectre仿真得到, 运放的单位增益带宽为3.53 MHz, 输入等效失调电压小于15.8 μV, 纹波等效到输入小于175 μV, 满足低频微弱信号的放大需求。

To reduce output ripples and release bandwidth limitation caused by chopping modulation,multipath structures were used to divide up the op amp into a high-frequency low-gain path and a low-frequency high-gain path,which determined the bandwidth and offset respectively.The chopping modulation was in the low-frequency high-gain path,which removed the bandwidth limitation of the operational amplifier.The Ping-pong auto-zeroing and chopping modulation were combined to reduce the offset and output ripples.The hybrid nested Miller compensation was us...