The precision composite buffer circuit compose of the MC1458

Published:2011/5/8 9:06:00 Author:TaoXi | Keyword: precision composite buffer | From:SeekIC

The precision composite buffer is as shown. The pre-stage of the circuit is the voltage follower that is composed of the precision op amp LM11, the parallel part of rear-stage uses the general dual op amp MC1458 (or MC1558 dual operational amplifier). The input signal adds to the same-phase input port (pin 3) of the pre-stage through R1 (10kΩ), pin 8 links the 330pF compensation capacitor C1 to achieve the over compensation, the objective is to improve the bandwidth and slew rate of the Parallel output buffer stage, sometimes we connect the 100pF capacitor C2 between the pre-stage's output port (pin 6) and the inverting input port (pin 2) to improve the stability of the circuit. Between the pre-stage's output port and the inverting input port, there are two diodes D1 and D2 (model is 1N914), the role is to clamp when LM11 is overdriven, to reduce the blocking tendency and to minimize the recovery time. Add the 10kΩ resistor R2 between the circuit's total output port and the pre-stage LM11's inverting input port, this resistance leads the depth voltage series negative feedback to make the op amp working in linear state. The main parameters (typical) of the dual op amp 1458 (1558):



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