L15Part3 Comparison of BJT Cascode & CE_1

L15Part3 Comparison of BJT Cascode & CE_1 - Zubair...

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Unformatted text preview: Zubair Rehman EE 311 Lecture 15 & EEO 311 Lecture 14 Part 3 6.8 Compairison of BJT Cascode & BJT Common-Emitter Mid-band Gain & High Frequency Response Ref: Basic SS Amp. Equations BJTFET Slide 6 2 The Cascode Amplifier Parameters: = 6 0 I C = 10 mA f T = 1000 / MHz T = 2 Grad/sec r x = 50 C = 5 pF g m = 40I C = 400 mS r = /g m = 60 / .4 = 150 C = g m / T = 400m/ 2G = 200 pF 3 Small - Signal Equivalent Circuit Midband Gain s b b c e o s o V V V V V V V V 1 1 1 2 * * = Correction Made c1 to b1 4 Which is the midband gain of a CB stage with R S = 0. V c1 / V b1 | CE = [(- R L1 ) / (r x1 + r 1 )] Midband gain of a CE Stage R L1 = R IN2 where R IN2 is the input resistance of a CB stage. R IN2 = (r x2 + r 2 ) / ( +1) for r x1 = r x2 & r 1 = r 2 We see that the midband gain of a cascode is the same as that of a single CE stage with a load resister R L = 1 k x L x L m x L m e o e o r r R r r R r g r r r V R V g V V V V V V + + = + + = + = = 2 2 2...
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This document was uploaded on 09/28/2011.

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L15Part3 Comparison of BJT Cascode & CE_1 - Zubair...

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