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Operational amplifier anti-blocking circuit

2017-01-06 18:28  
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Operational amplifier anti-blocking circuit
If we add the large signal or the larger interference to the reverse phase input port of the operational amplifier, the amplifier always can't work normally, and there will be the phenomenon of the signal can not enter the amplifier or the output intermittent, at this time, you must turn off the power supply then turn on again or remove the signal for a period of time, so the amplifier can return to normal. This phenomenon called the blockade or the lockout. This phenomenon is caused by: the transistor of the input stage is saturated, the reverse phase input port and output port lose the nature of the opposite phase, so the circuit changes into the positive feedback.