Question

1. Consider the circuit as shown in Fig. 1. NPN transistors Q1...Q4 have an VA = 50V and $\beta$ = 40. The reference current $I_{ref}$ is always maintained at a constant value, typically at 1 mA. (i) Derive an expression for R as a function of $I_{ref}$, $I_O$ and the reverse saturation current $I_S$. (ii) If $I_O = 24 \,\mu A$, then what is the value of R? (iii) Based on your answer to part (ii) of this question, determine the small signal resistance $R_{out}$.

          1. Consider the circuit as shown in Fig. 1. NPN transistors Q1...Q4 have an VA = 50V and \(\beta\) = 40. The reference current $I_{ref}$ is always maintained at a constant value, typically at 1 mA.
(i) Derive an expression for R as a function of $I_{ref}$, $I_O$ and the reverse saturation current $I_S$.
(ii) If $I_O = 24 \,\mu A$, then what is the value of R?
(iii) Based on your answer to part (ii) of this question, determine the small signal resistance $R_{out}$.

1. Consider the circuit as shown in Fig. 1. NPN transistors Q1...Q4 have an VA = 50V and β = 40. The reference current Iref is always maintained at a constant value, typically at 1 mA.
(i) Derive an expression for R as a function of Iref, IO and the reverse saturation current IS.
(ii) If IO = 24 μ A, then what is the value of R?
(iii) Based on your answer to part (ii) of this question, determine the small signal resistance Rout.

Added by Eduardo C.

University Physics with Modern Physics

Hugh D. Young 14th Edition

Instant Answer

Solved by Expert Madhur L

07/24/2023

Step 1

Step 1: To derive an expression for R as a function of Iref, lo, and the reverse saturation current Is, we can start by analyzing the circuit. Show more…

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1.Consider the circuit as shown in Fig.1.NPN transistors Q1...Q4 have an VA=50V and =40.The reference current Iref is always maintained at a constant value, typically at 1 mA. Fig.1 (i) (i) (iii) Derive an expression for R as a function of Iref, lo and the reverse saturation current Is. If lo=24uA,then what is the value of R Based on your answer to part (ii) of this question, determine the small signal resistance Rout.