DD V pp lo VEE

Delmar's Standard Textbook Of Electricity
7th Edition
ISBN:9781337900348
Author:Stephen L. Herman
Publisher:Stephen L. Herman
Chapter30: Dc Motors
Section: Chapter Questions
Problem 6RQ: What is CEMF?
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Question

(a) What is the output current IO in the circuit
shown if −VEE = −10 V and
R = 20 ohm? Assume that the MOSFET is saturated.
(b) What is the minimum voltage VDD
needed to saturate the MOSFET if VTN = 2.5 V
and K'n = 0.25 A/V2. (c) What must be the power
dissipation ratings of resistor R and the FET.

DD
V pp
lo
VEE
Transcribed Image Text:DD V pp lo VEE
Expert Solution
Step 1

a) The circuit can be modified for better understanding  is given as 

Electrical Engineering homework question answer, step 1, image 1

  • The voltage at non inverting terminal is given as 0V hence by virtual ground concept the voltage as Inverting terminal is given as 0V  
  • The current I can be found as 

Electrical Engineering homework question answer, step 1, image 2

Step 2

b)

The drain current equation in case of saturation is given as

Electrical Engineering homework question answer, step 2, image 1

Thus minimum voltage of VDD should be 4.5 V for the MOSFET to be in saturation.

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