How to solve the circuit when both positive and negative feedback are present?
Answers
Answer:
Explanation:
When both positive and negative feedback present ,then at first we calculate the amount of feedback signal comes to the both inverting and non inverting input of op-amp input.Let’s assume B1=negative feedback factor and B2=positive feedback factor.this calculation should be done from the circuit.Then compare those two feedback factor .which factor is more,circuit is under that type of feedback.
if negative feedback coming then apply virtual short concept and assume some same voltage (say V1) to the both inverting and non inverting input of op amp and Write down KCL equation for two nodes.
****BUT don’t apply KCL at output node…this is not meant that KCL is not valid for output node,KCL must be valid but calculation may be complex