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JP2003347866A Operational transconductance amplifier and agc amplifier using the operational transconductance amplifier 有权
标题翻译：运行中的运算放大器和AGC放大器使用运算放大器
公开(公告)号：JP2003347866A
公开(公告)日：2003-12-05
申请号：JP2002153810
申请日：2002-05-28
申请人： Fujitsu Ltd , 富士通株式会社
发明人： KUMETA TOMOYUKI , KIZAKI TAKAHIRO
IPC分类号： H03F3/45 , H03G1/00 , H03G3/10
CPC分类号： H03F3/45744 , H03F3/45197 , H03F2203/45458 , H03F2203/45471 , H03F2203/45482 , H03F2203/45494 , H03F2203/45496 , H03F2203/45648 , H03G1/0023
摘要： PROBLEM TO BE SOLVED: To remove a direct current offset voltage which occurs due to the transistor characteristics of a differential pair, and to eliminate output errors.
SOLUTION: Resistors R3 and R4 are bridge-connected between a source terminal of MOSFETs M1 and M2, which make up a differential pair of an OTA (operational transconductance amplifier) 1. Capacitors C1 and C2, for removing a direct current signal component, are connected in parallel between the resistors R3 and R4. These C-R circuits make up a high path filter for shutting down the direct current component. According to this arrangement, if there is a difference in the transistor characteristics between MOSFETs M1 and M2 of the differential pair, a direct current offset voltage will not appear at the output of differential output terminals OP and OM of the OTA1, and output errors can be eliminated. When the OTA1 is used in an AGC amplifier, the dynamic output range of the AGC amplifier can be expanded, due to the removal of the direct current offset voltage.
COPYRIGHT: (C)2004,JPO
摘要翻译：要解决的问题：消除由于差分对的晶体管特性引起的直流偏移电压，并消除输出误差。
解决方案：电阻器R3和R4桥接在MOSFET M1和M2的源极端子之间，MOSFET的源极端子组成OTA（可操作跨导放大器）的差分对1.电容器C1和C2用于去除直流电流信号在电阻R3和R4之间并联连接。这些C-R电路组成一个高路径滤波器，用于关闭直流分量。根据这种配置，如果差分对的MOSFET M1和M2之间的晶体管特性存在差异，则直流偏移电压将不会出现在OTA1的差分输出端子OP和OM的输出端，并且输出误差可以被淘汰。当在AGC放大器中使用OTA1时，由于去除了直流偏移电压，AGC放大器的动态输出范围可以扩展。版权所有（C）2004，JPO

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