Lecture 14_ Feb 21 2011

Lecture 14_ Feb 21 2011 - Chapter 17 Amplifier Frequency...

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Chapter 17 Amplifier Frequency Response Lecture 14 Covered Section: 17.3
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Short-Circuit Time Constant Method to Determine ϖ L Lower cutoff frequency for a network with n coupling and bypass capacitors is given by: where R iS is resistance at terminals of i th capacitor C i with all other capacitors replaced by short circuits. Product R iS C i is short-circuit time constant associated with C i . = 2245 n i i C iS R L 1 1 Midband gain and upper and lower cutoff frequencies that define bandwidth of amplifier are of more interest than complete transfer function. Chap 17.3
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Estimate of ϖ L for C-E Amplifier Chap 17.3 Using SCTC method, for C 1 , s rad F C S R k k r B R R R CE in B R I R S R / 222 2 2260 1 1 1 1 2260 ) 1510 5 . 7 ( 1 ) ( 2 ) ( 1 = × = = + = + = + = μ π
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Estimate of ϖ L for C-E Amplifier For C 2 , s rad F C S R o B R I R r R o th R r R R iE R S R / 4300 10 3 . 23 1 2 2 1 3 . 23 101 882 1510 1300 1 ) ( 4 1 4 4 2 = × = = + =
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Lecture 14_ Feb 21 2011 - Chapter 17 Amplifier Frequency...

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