LIVE Course for free

Rated by 1 million+ students
Get app now
0 votes
20 views
in Electronics by (54.3k points)
closed by
The output resistance of FET when operating in pinch off at a current 10 mA and λ = 0.05 V-1 is given as
1. 450 Ω 
2. 2 kΩ 
3. 200 Ω 
4. 2 Ω 

1 Answer

0 votes
by (30.0k points)
selected by
 
Best answer
Correct Answer - Option 2 : 2 kΩ 

Concept:

The output Resistance of FET is defined as

\({r_o} = \frac{1}{{\lambda {I_D}}}\)

Where λ = channel length modulator parameter

ID = drain current

Calculation:

Given

λ = 0.05 V-1

ID = 10 mA Important Point:

\({r_o} = \frac{1}{{\lambda {I_D}}} = \frac{1}{{0.05 \times 10 \times {{10}^{ - 3}}}} = 2K{\rm{\Omega }}\)

NOTE: 

If MOSFET does not have a channel length modulator then ⇒ λ = 0

\({r_{ds}} = \frac{1}{{\lambda {I_{DS}}}} = \infty \) (of P resistance)

Welcome to Sarthaks eConnect: A unique platform where students can interact with teachers/experts/students to get solutions to their queries. Students (upto class 10+2) preparing for All Government Exams, CBSE Board Exam, ICSE Board Exam, State Board Exam, JEE (Mains+Advance) and NEET can ask questions from any subject and get quick answers by subject teachers/ experts/mentors/students.

Categories

...