Question

How can we successfully avoid Miller effect?

(a) using a common-base amplifier

(b) using a common-emitter amplifier

(c) by increasing the Q factor

(d) by decreasing the Q factor

I had been asked this question during an interview for a job.

My question is based upon Bandwidth of FM Signal with Arbitrary m(t) topic in portion Angle Modulation of Analog Communications

Answer 1

Right answer is (a) using a common-base amplifier

To explain: Miller effect is responsible for the increase in equivalent input capacitance of an inverting voltage amplifier. The increase equivalent input capacitance is given by, CM = C(1 + AV). Miller effect can be avoided by using a common-base amplifier.