Question: (a) Equation 6.69 gives the random input off-set voltage of the op amp in Fig. 6.16. Explain the polarity of each term in (6.69) by

(a) Equation 6.69 gives the random input off-set voltage of the op amp in Fig. 6.16. Explain the polarity of each term in (6.69) by assuming that the matching is perfect except for the term under consideration. Keep in mind that the overdrive is negative for p-channel transistors. Therefore, (6.69) predicts that the offset stemming from W₃>W₄is negative.

(b) Repeat (a) for an op amp that uses an n-channel differential pair and a p-channel current mirror load. Equation 6.69 still applies in this case.

Figure 6.16

+Vcc R12 To output stage R1 R11 Q4 Q3 Q2 Q1 -VEE

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a For simplicity replace M 5 in fig 616 with an ideal current source Although this change makes the common mode gain of the on amp zero this change does not affect the characteristics of the circuit f... View full answer

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