COMPARISON OF THREE DIFFERENTIAL shovn have the same bias currents and all the r

Question

COMPARISON OF THREE DIFFERENTIAL shovn have the same bias currents and all the resistors are 10k2. Circle the sin (Version A) AMPLIFIERS shown below: Assume that the input transistors e gle best answer- "much fower, "about the ke ach of the following statements true. (2 pts. each; NO PENALTY for wrong answers) CIRCUITB VERSUS CIRCUIT A 8· A,ou of circuit B is "much lower" "about the same" "niach higher" than Ao of circuit A. 9. R of circuit B is 10. CMRR of circuit B is "much lower" "about the same" "much higher" than CMRR of circuit A. CIRCUIT B VERSUS CIRCUIT C I1. Aou of circuit B is "much lower" "about the same" "much higher" than A.ou of circuit C 12. R of circuit B is 13. CN1RR of circuit B is "niuch lower" "a "much lower" "about the same" "much higher" than R, of circuit A. "much lower" "about the sames muck higher" than Rg of circuit C. bout the same" "much higher" than CMRR of circuit C. 14 Ulse he open lop reguensy Bode res pojns eain k phasf ompowblowto answerthe following The Bode plots indicate i that the amplifier's transfer function has a) just two open loop poles b) The op amp shown will be UNSTABLE for unity negative feedback b) For 20 log /B-100 dB, the phase margin would be about 60° and thus STABLE

Explanation / Answer

8). Common mode gain for circuit B is much higher than Common mode gain for circuit A. As the common mode gain depend on the resistance offered by tail current source. In B tail current is implemented by simple resistance and in A it is implemented by BJT.

9).Ric for circuit B is much lower than Ric for circuit A.In B tail current is implemented by simple resistance(low resistance) and in A it is implemented by BJT(high resistance).

10).CMRR for circuit B is much lower than CMRR for circuit A. As the CMRR depend on the resistance offered by tail current source. In B tail current is implemented by simple resistance and in A it is implemented by BJT.

11).Differential gain for circuit B is much lower than Differential gain for circuit C. As the Differential mode gain depend on the resistance offered by load. In B load is implemented by simple resistance and in C it is implemented by BJT.

12).Rid for circuit B is about the same as Rid for circuit C.As the emmiter of both BJT is virtual grounded in case of differential.

13).CMRR for circuit B is much lower than CMRR for circuit C.

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