Find the input resistance for the given circuit
A. RIF = Ri*[1+(A*R4+R5)/(2* R4+R5)]
B. RIF = Ri*[1+(A*R4)/(2* R4+R5)]
C. RIF = Ri*[1+(A*R4+R5)/(R4+R5)]
D. None of the mentioned
Answer:A
Find the input resistance for the given circuit
A. RIF = Ri*[1+(A*R4+R5)/(2* R4+R5)] B. RIF = Ri*[1+(A*R4)/(2* R4+R5)] C. RIF = Ri*[1+(A*R4+R5)/(R4+R5)] D. None of the mentioned
Explanation: The input resistance of the op-amp with feedback is given as RIF= Ri*(1+AB).