Explanation: A simple low pass RC circuit can work as an integrator when time constant is very large, which require large value of R and C. Due to practical limitations , the R and C cannot be made infinitely large. 4. How a perfect integration is achieved in op-amp?
A. Infinite gain
B. Low input impedance
C. Low output impedance
D. High CMRR
Answer:A
Explanation: A simple low pass RC circuit can work as an integrator when time constant is very large, which require large value of R and C. Due to practical limitations , the R and C cannot be made infinitely large. 4. How a perfect integration is achieved in op-amp?
A. Infinite gain B. Low input impedance C. Low output impedance D. High CMRR
Explanation: In an op-amp integrator the effective input capacitance becomes CF×(1-Av). Where Av is the gain of op-amp. The gain is infinite for ideal op-amp. So, effective time constant of the op-amp integrator becomes very large which results in perfect integration. 5. The op-amp operating in open loop result in output of the amplifier to saturate at a voltage