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适用于功率运算放大器的输入级放大电路设计
资料介绍
基于70V高压双极型工艺,设计了一种适用于单片高压功率运算放大器的输入级电路。该电路采用p沟道结型场效应晶体管(JFET)组成的差分对套筒式共源共栅(differential telescopic cascode)结构,具有低偏置电流、低失调电压、低失调电流、高共模抑制比的特点。以共集-共射(CC-CE)的放大电路结构作为该输入级电路的负载,减小对输入级影响的同时能够提高电压增益。Spectre仿真结果表明,输入偏置电流仅为20pA,失调电压为0.11mV,失调电流为0.57fA,连接负载后的增益可以达到89dB,单位增益带宽达到8.13MHz。
An input stage amplifier is designed for a power operational amplifier based on 70 V high voltage bipolar technology.The amplifier circuit implements a differential telescopic cascode pair using p-type JFETs.It has figure of merits involving low bias current,low offset voltage and current,and high CMRR.The common-collector common-emitter(CC-CE)configuration is used as the load for the input stage circuit in order to reduce the impact resulting from the load and improve the voltage gain as well.Simulation results based on Spectre simulator indicate that the input stage amplifier circuit has achieved 20 pA input bias current,0.11 mV offset voltage and 0.57 fA offset current,while the voltage gain is 89 dB and the unit gain-bandwidth is 8.13 MHz,with the CC-CE load.
部分文件列表
| 文件名 | 大小 |
| 适用于功率运算放大器的输入级放大电路设计.pdf | 3M |
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