# Ch08s - Chapter 8 Problem Solutions 8.1 a b i VD D = 80 V...

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Chapter 8 Problem Solutions 8.1 a. b. i. 80 V D D V = Maximum power at 40 V 2 25 0.625 A 40 80 40 64 0.625 D D DS T D D S D D V V P I V R R = = = = = = = Ω ii. 50 V D D V = Maximum power at 25 V 2 25 1 A 25 50 25 25 1 D D D S T D DS D D V V P I V R R = = = = = = = Ω 8.2 a.

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(max) 2 2 (max) 2(20) So 1.67 A 24 ( / 2) 24 12 7.2 1.67 1.67 20.8 mA 80 24 0.7 1.12 k 20.8 C C Q C Q Q C Q CC CC CC L L CQ CQ B B B V P I P I V V V R R I I I R R β = = = = = = = Ω = = = = Ω b. ( )( ) 0 0 1.67 7.2 462 0.026 (max) 12 (max) 12 V 26 mV 462 CQ L v m L T P P v I R A g R V V V V V A = = = = = = = 8.3 a. For maximum power delivered to the load, set 2 C C C EQ V V = ( ) sus Set 25 V C C CE V V = = ( ) ( )( ) ,max D,max 25 Then 0.1 250 mA 25 12.5 125 mA 0.1 max 0.125 12.5 2 1.56 W P 125 1.25 mA 100 25 0.7 19.4 k 1.25 CC Cm L Cm C CQ CC Q CQ BQ B B V I R I I I V P I I R R = = = < = = = = = < = = = = Ω b. ( ) ( ) ( ) ( ) ( ) 2 2 1 1 max 0.125 100 max 0.781 W rms 2 2 L CQ L L P I R P = = = 8.4 Point (b): Maximum power delivered to load. Point (a): Will obtain maximum signal current output. Point (c): Will obtain maximum signal voltage output.