Question 1 Which pole is dominant for a MOS differential amp

Question 1

Which pole is dominant for a MOS differential amplifier with active load?

            A.fPo

            B.fZ

            C.fP1

            D.fP2

            E.fPi

Question 1

A MOS differential amplifier with resistor load has RSS = 156 k and CSS = 37 fF. What is the 3-dB frequency of the CMRR? (MHz, 1 decimal)

Question 2

A MOS differential amplifier with active load has gm3 = 785 A/V and Cm = 13 fF. What is the frequency of the mirror pole? (GHz, 2 decimals)

Solution

Q1)

fp1 and fp2 are the poles of the MOS differential amplifier, out of that fp1 is the dominant accoding to the fp1<<fp2 condition.