# Chapter 12 - CHAPTER 12 Exercises E12.1 (a) vGS = 1 V and...

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1 CHAPTER 12 Exercises E12.1 (a) v GS = 1 V and DS = 5 V: Because we have < V to , the FET is in cutoff. (b) = 3 V and = 0.5 V: Because > and GD = = 2.5 > , the FET is in the triode region. (c) = 3 V and = 6 V: Because > and = = 3 V < , the FET is in the saturation region. (d) = 5 V and = 6 V: Because v GS > and = = 1 V which is less than , the FET is in the saturation region. E12.2 First we notice that for V, 1 or 0 = the transistor is in cutoff, and the drain current is zero. Next we compute the drain current in the saturation region for each value of : 2 6 2 1 2 1 mA/V 1 ) 2 / 80 )( 10 50 ( ) / ( = × = = L W KP K 2 ) ( D i = The boundary between the triode and saturation regions occurs at = (V) (mA) at boundary 2 1 1 3 4 2 4 9 3 In saturation, is constant, and in the triode region the characteristics are parabolas passing through the origin. The apex of the parabolas are on the boundary between the triode and saturation regions. The plots are shown in Figure 12.7 in the book. E12.3 First we notice that for V, 1 or 0 = the transistor is in cutoff, and the drain current is zero. Next we compute the drain current in the saturation region for each value of :

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2 2 6 2 1 2 1 mA/V 25 . 1 ) 2 / 200 )( 10 25 ( ) / ( = × = = L W KP K 2 ) ( to GS D V v i = The boundary between the triode and saturation regions occurs at DS = . (V) (mA) at boundary 2 1.25 1 3 5 2 4 11.25 3 In saturation, is constant, and in the triode region the characteristics are parabolas passing through the origin. The apex of the parabolas are on the boundary between the triode and saturation regions. The plots are shown in Figure 12.9 in the book. E12.4 We have 3 ) 2000 sin( ) ( ) ( + = + = t GG in π Thus we have 4 max = V, 3 = GSQ V, and 2 min = V. The characteristics and the load line are:
3 For v in = +1 we have GS = 4 and the instantaneous operating point is A . Similarly for = 1 we have = 2 V and the instantaneous operating point is at B . We find V DSQ 11 V, DS min 6 V, max 14 V. E12.5

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## This note was uploaded on 11/02/2010 for the course ECE 3710 taught by Professor Haris during the Spring '07 term at Georgia Institute of Technology.

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Chapter 12 - CHAPTER 12 Exercises E12.1 (a) vGS = 1 V and...

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