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Asked: 2023-07-23T08:44:04-04:00 In:

13.54 Consider the dc analysis of the 741 input stage shown in Fig. 13.23. (a) Derive an expression for I taking βP into account. What is the percentage change in I if βP drops from 50 to 20? Assuming VA| = 50 V, βp = 50, and IC6 = 20 µA, what value of R provides Ro6 = 20 MΩ? How does this affect the CMRR calculated in Exercise 13.24? (b) Now, consider an alternative design of this circuit in which the feedback loop is eliminated. That is, Q5 and Q6 are eliminated, and IREF is fed to the common-base connection of Q3 and Q4. What is I now in terms of IREF? If βP changes from 50 to 20, what is the resulting percentage change in I?

Venkyelectrical
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13.54 Consider the dc analysis of the 741 input stage shown in Fig. 13.23.

(a) Derive an expression for I taking βP into account. What is the percentage change in I if βP drops from 50 to 20? Assuming VA| = 50 V, βp = 50, and IC6 = 20 µA, what value of R provides Ro6 = 20 MΩ? How does this affect the CMRR calculated in Exercise 13.24?
(b) Now, consider an alternative design of this circuit in which the feedback loop is eliminated. That is, Q5 and Q6 are eliminated, and IREF is fed to the common-base connection of Q3 and Q4. What is I now in terms of IREF? If βP changes from 50 to 20, what is the resulting percentage change in I?

13.54 Consider the dc analysis of the 741 input stage shown in Fig. 13.23. (a) Derive an expression for I taking βP into account. What is the percentage change in I if βP drops from 50 to 20? Assuming VA| = 50 V, βp = 50, and IC6 = 20 µA, what value of R provides Ro6 = 20 MΩ? How does this affect the CMRR calculated in Exercise 13.24? (b) Now, consider an alternative design of this circuit in which the feedback loop is eliminated. That is, Q5 and Q6 are eliminated, and IREF is fed to the common-base connection of Q3 and Q4. What is I now in terms of IREF? If βP changes from 50 to 20, what is the resulting percentage change in I?

microelectronics by sedra & smith chapter 13 questions

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