HF crib sheet

HF crib sheet - ECE137B High-Frequency Amplifier Crib Sheet...

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ECE137B: High-Frequency Amplifier Crib Sheet, Page 1 Basics: Transistor small-signal high-frequency models V be C & C & R & g m V be R o C B E Hybrid-pi model: C m = C bc C p = C be = C , depl + C , diff C , diff = g m t f f = g m 2 C + C () g m = a r e = I c V T R = b + 1 r e R o = V A I C C & C & R o C B E r e g m V eb V eb "T"-model Makes common-base analysis much easier. Both these models are only approximate, being "good" up to f t . Additionally R b ' b is often an important parasitic (not discussed much in 137B. Simplification of Emitter Degeneration R E approximate only; check notes for bounds on validity ˜ C = C r e r e + R E ˜ g m = g m r e r e + R E = r e + R E ˜ C = C ˜ R = R r e + R E r e = + 1 r e + R E Common-Emitter Stage C B C & C & g m V be V be R Leq R i I i C L V out V gen = V out V gen MB 1 + s zero 1 + a 1 s + a 2 s 2 a 1 = R i C + C 1 + g m R Leq + R Leq C + C L a 2 = R i R Leq C C L + C C + C C L zero =- C g m
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ECE137B: High-Frequency Amplifier Crib Sheet, Page 2 Emitter-Follower Stage B E C & C & g m V be V be R Leq R i I i C L R & V out V gen = V out V gen () MB 1 + s t zero 1 + a 1 s + a 2 s
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This note was uploaded on 08/06/2008 for the course ECE 145 taught by Professor Rodwell during the Fall '07 term at UCSB.

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HF crib sheet - ECE137B High-Frequency Amplifier Crib Sheet...

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