Answered: Figure 4.156

Introductory Circuit Analysis (13th Edition)

13th Edition

ISBN:9780133923605

Author:Robert L. Boylestad

Publisher:Robert L. Boylestad

Chapter1: Introduction

Section: Chapter Questions

Problem 1P: Visit your local library (at school or home) and describe the extent to which it provides literature...

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Question

The JFETs have I_DSS 1 = 200 μA,
V_P 1 = −2 V, I_DSS 2 = 500 μA, and V_P 2 = −4 V.
(a) Find the Q-point for the two JFETs if V = 9 V.
(b) What is the minimum value of V that will
ensure that both J₁ and J₂ are in pinch-off?

Expert Solution

Step 1

(a)

For transistor 1, the gate and drain are connected together, hence it works in the triode region.

Write the expression for the drain current.

Step 2

From the circuit, write the relation between the drain-source voltage of the two transistors.

Step 3

Write the expression for the drain current of transistor 2 in the saturation region.

Step 4

As seen from the circuit, the drain currents are the same for both the transistors.

Step 5

Calculate the value of V_DS2.

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