amplifiers

# amplifiers - Single stage amplifier crib sheet page 1...

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Single stage amplifier crib sheet, page 1 Basics: Amplifiers at Low Frequencies Vbe gmVbe r be r ce B E C gmVgs r ds Vgs G S D Left is the equivalent circuit of a bipolar transistor; g m =I E /V T =1/r e , V T =kT/q, r b’e =§r e =§/g m . On the right is the FET model. Below is a transistor with ac equivalent load resistances R c , R E , and R B . RC RE RB Rin, base Rin, emitter Rin, collector For the bipolar R in , base = β + 1 (29 R E + r e (29 R in , emitter = r e + R B + 1 r ce + R C r ce 2245 r e + R B + 1 , R in , collector = r ce 1 + g m R E r b ' e r b ' e + R E + R B 2245 r ce 1 + g m R E {} RD RS RG Rin,gate Rin, source Rin, drain For the fet: THE EQUATIONS ARE THE SAME IF § is INFINITE! R in , gate = open R in , source = 1 g m R D + r ds r ds 2245 1 g m R in , drain = r ds 1 +

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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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amplifiers - Single stage amplifier crib sheet page 1...

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