Chap7part5 - Ch. 7 Frequency Response Part 5 1 ECES 352...

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Unformatted text preview: Ch. 7 Frequency Response Part 5 1 ECES 352 Winter 2007 Comparison of Amplifier Configurations Midband Characteristics* • These are approximate expressions neglecting the effects of the biasing resistors R 1 and R 2 and the source resistance R S . J. Millman and A. Grabel, Microelectronics, 2 nd Ed., McGraw Hill, NY (1987), p. 420. Ch. 7 Frequency Response Part 5 2 ECES 352 Winter 2007 Characteristics of Amplifier Configurations Current gain is large ( u β) for CE and EF, but < 1 for CB. Voltage gain is large for CE and CB, but < 1 for EF. Input resistance is • Very small (few Ωs) for CB, • Medium (few KΩs) for CE, but • Very large (~ 10’s of KΩs) for EF. Output resistance is • Very small (few Ωs) for EF, • Very large (~ 100’s of KΩs) for CE and CB. Ch. 7 Frequency Response Part 5 3 ECES 352 Winter 2007 Numerical Comparison of Amplifier Configurations for the Same Transistor and DC Biasing • These are approximate expressions neglecting the effects of the biasing resistors R 1 and R 2 S Ch. 7 Frequency Response Part 5 4 ECES 352 Winter 2007 Comparison of CB to CE Amplifier (with same R s = 5 Ω) CE (with R S = 5 Ω) CB (with R S = 5Ω) Midband Gain Low Frequency Poles and Zeros High Frequency Poles and Zeroes ( 29 [ ] [ ] ( 29 ( 29 ( 29 ( 29 dB dB A V V A r r r r R R r R R R g V V V V V V A Vo Vo x e E s e E C L m s e e o Vo 2 . 40 / 4 . 102 5 . 94 . 218 = + =-- = +- +- = = π π π π [ ] ( 29 ( 29 ( 29 s rad x pF K C R R s rad x pF C R R r L C PH s E e PH ZH ZH / 10 1 . 7 3 . 1 05 . 1 1 1 / 10 5 . 2 17 4 . 2 1 1 , 8 2 10 1 2 1 = = = = Ω = = ∞ = ∞ = μ π ϖ ϖ ϖ ϖ ( 29 ( 29 ( 29 [ ] { } ( 29 ( 29 ( 29 ( 29 s rad F K C R R s rad x K F r g r r R R C s rad K F C R R r g r r R s rad F K C R C C L PL m x E s C PL B S E m x B PL B B ZP ZP ZP / 33 3 2 . 10 1 1 / 10 . 5 010 . 2 1 1 1 / 83 1 12 1 1 1 / 42 12 2 1 1 2 3 4 1 2 1 3 2 1 = = + = = = + + + = = = + + + = = = = = = μ ϖ μ ϖ μ ϖ μ ϖ ϖ ϖ π π π π ( 29 [ ] ( 29 [ ] ( 29 [ ] ( 29 ( 29 ( 29 ( 29 dB dB A V V A R r r R R r r r r r R R g V V V V V V V V A Vo Vo B x s B x x C L m s i i o s o Vo 6 . 45 ) 191 log( 20 / 191 93 . 94 . 218 =- =- =- = + + + +- = = = π π π π π π ( 29 ( 29 [ ] ( 29 ( 29 ( 29 ( 29 s rad x F K C R R r r R s rad F K C R R s rad F K C r r R R s rad F K C R E B s x E PL C C L PL C x B S PL E E ZP ZP ZP / 10 7 . 1 12 005 . 1 1 1 / 33 3 2 . 10 1 1 / 714 2 7 . 1 1 / 252 12 33 . 1 1 4 3 2 2 1 1 3 2 1 = = + + + = = = + = = = + + = = = = = = μ β ϖ μ ϖ μ ϖ μ ϖ ϖ ϖ π π ( 29 [ ] ( 29 ( 29 ( 29 ( 29 ( 29 s rad x pF K C R R r r R R g R R s rad x pF K C R R r r s rad x pF V mA C g S B x L C m L C PH S B x PH m ZH ZH / 10 . 5 3 . 1 4 . 15 1 1 1 1 1 / 10 . 9 17 065 ....
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This note was uploaded on 04/28/2010 for the course ECECS 352 taught by Professor Cahay during the Spring '10 term at University of Cincinnati.

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Chap7part5 - Ch. 7 Frequency Response Part 5 1 ECES 352...

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