The amplifer circuit formed by LM121 and used in device

Published:2011/6/8 21:08:00 Author:leo | Keyword: The amplifer circuit formed by LM121 and used in device, LM121 | From:SeekIC

Picture 1 is an amplifier used in device. It is made up of LM121 and others. LM121 changes the differential input voltage into differential output voltage to drive the backdrop operating amplifier A1. A1 can form current-voltage converting circuit which change differential input to output. R1, R2 and RP1 are used to set the working current of LM 121 and regulate the imbalance current(voltage) of the circuit. While RP2 is used to regulate gain. They do not influence each other. The limited input voltage of LM121 is ±10mV, which can form higher common mode rejection ratio (120dB) and low drifting device amplifier.



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