9.58 It can be shown that if the drain resistors of a MOS differential amplifier have a mismatch RD and if simultaneously the transconductances of Q1 and Q2 have a mismatch gm, the common-mode gain is given by A cm  2RRDSS ggmm + RRDD  Note that this equation indicates that RD can be deliberately varied to compensate for the initial variability in gm and RD, that is, to minimize Acm. In a MOS differential amplifier for which RD =5 k and R SS =25 k, the common-mode gain is measured and found to be 0.002 V/V. Find the percentage change required in one of the two drain resistors so as to reduce A cm to zero (or close to zero).

9.58 - 9.58 It can be shown that if the drain resistors of a MOS differential amplifier have a mismatch RD and if simultaneously the transconductances of Q1 and Q2 have a mismatch gm, the common-mode gain is given by A cm  2RRDSS ggmm + RRDD  Note that this equation indicates that RD can be deliberately varied to compensate for the initial variability in gm and RD, that is, to minimize Acm. In a MOS differential amplifier for which RD =5 k and R SS =25 k, the common-mode gain is measured and found to be 0.002 V/V. Find the percentage change required in one of the two drain resistors so as to reduce A cm to zero (or close to zero).

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images - 9.58 It can be shown that if the drain resistors of a MOS differential amplifier have a mismatch RD and if simultaneously the transconductances of Q1 and Q2 have a mismatch gm, the common-mode gain is given by A cm  2RRDSS ggmm + RRDD  Note that this equation indicates that RD can be deliberately varied to compensate for the initial variability in gm and RD, that is, to minimize Acm. In a MOS differential amplifier for which RD =5 k and R SS =25 k, the common-mode gain is measured and found to be 0.002 V/V. Find the percentage change required in one of the two drain resistors so as to reduce A cm to zero (or close to zero).

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