*2.75 For an instrumentation amplifier of the type shown in Fig. 2.20(b), a designer proposes to make R2 = R3 = R 4 = 100 k, and 2R1 = 10 k. For ideal components, what difference-mode gain, common-mode gain, and CMRR result? Reevaluate the worst-case values for these for the situation in which all resistors are specified as ±1% units. Repeat the latter analysis for the case in which 2R1 is reduced to 1 k. What do you conclude about the effect of the gain of the first stage on CMRR? (Hint: Eq. (2.19) can be used to evaluate A cm of the second stage.)

75 - *2.75 For an instrumentation amplifier of the type shown in Fig. 2.20(b), a designer proposes to make R2 = R3 = R 4 = 100 k, and 2R1 = 10 k. For ideal components, what difference-mode gain, common-mode gain, and CMRR result? Reevaluate the worst-case values for these for the situation in which all resistors are specified as ±1% units. Repeat the latter analysis for the case in which 2R1 is reduced to 1 k. What do you conclude about the effect of the gain of the first stage on CMRR? (Hint: Eq. (2.19) can be used to evaluate A cm of the second stage.)

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images - *2.75 For an instrumentation amplifier of the type shown in Fig. 2.20(b), a designer proposes to make R2 = R3 = R 4 = 100 k, and 2R1 = 10 k. For ideal components, what difference-mode gain, common-mode gain, and CMRR result? Reevaluate the worst-case values for these for the situation in which all resistors are specified as ±1% units. Repeat the latter analysis for the case in which 2R1 is reduced to 1 k. What do you conclude about the effect of the gain of the first stage on CMRR? (Hint: Eq. (2.19) can be used to evaluate A cm of the second stage.)

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