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L15Part3 Comparison of BJT Cascode & CE_1

L15Part3 Comparison of BJT Cascode & CE_1 - EE 311...

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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
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2 The Cascode Amplifier Parameters: β = 60 I C = 10 mA f T = 1000 / π MHz ω T = 2 Grad/sec r x = 50 C μ = 5 pF g m = 40I C = 400 mS r π = β /g m = 60 / .4 = 150 C π = g m / ϖ T = 400m/ 2G = 200 pF
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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
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4 Which is the midband gain of a CB stage with R S = 0. V c1 / V b1 | CE = [(- β R L1 ) / (r x1 + r π1 )] 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 π2 ) / ( β +1) for r x1 = r x2 & r π 1 = r π 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 π π π π π β * * * 2 2 2 2 2 2 2 2 2 π π π π π β β β r r R R V V r r R r r V V r r r r V V x s L s o x s x s b x x b c + + - + + + = - 2245 + + + - = 2 1 1 2 1 1 1 1 1
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