(a) What is the input resistance to the commongate stage shown if ID = 1 mA, Kp = 1.25 mA/V2, and VT P = 2 V? (b) Repeat for ID = 3 mA and VT P = 2.5 V. 27 k2Figure P14.49

Answered: 27 k2 Figure P14.49

Introductory Circuit Analysis (13th Edition)

13th Edition

ISBN:9780133923605

Author:Robert L. Boylestad

Publisher:Robert L. Boylestad

Chapter1: Introduction

Section: Chapter Questions

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(a) What is the input resistance to the commongate stage shown if I_D = 1 mA, K_p = 1.25 mA/V², and V_{T P} = 2 V? (b) Repeat for I_D = 3 mA and V_{T P} = 2.5 V.

Expert Solution

Step 1

Concept:

An electronic circuit which makes logical decisions based on the combination of digital signals present on its inputs and which has more than one input which is called a digital logic gate.

Step 2

Given:

$I D = 1 m A k p = 1.25 m A / V_{2} V T P = 2 V (i i) I D = 4 m A V T P = 2.4 V$

Step 3

The circuit diagram of a common-gate stage amplifier is as follows

Step 4

(a)

It is given that,

The drain current is, $I_{D} = 1 m A$

The trans conductance is $K_{p} = 1.25 m A / V^{2}$

The threshold voltage for PMOS is $V_{T P} = 2 V$

Step 5

$Calculating the transconductance (g_{m}) o f t h e a m p l i f i e r g_{m} = \sqrt{2 (K_{P}) (I_{D})} g_{m} = \sqrt{2 (1.25 m m A / V^{2}) (1 m A)} g_{m} = 1.58 m S$

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