BJT transistors.

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Presentation transcript:

BJT transistors

Basic single-stage BJT amplifier configurations We will study 3 types of BJT amplifiers CE - common emitter, used for AV, Ai, and general purpose CE with RE - common emitter with RE, same as CE but more stable CC common collector, used for Ai, low output resistance, used as an output stage CB common base (not covered)

Common emitter amplifier ac equivalent circuit

Common emitter amplifier ib iout Rin (Does not include source) Rin = Rpi + Vout - Rout Rout (Does not include load) Rout = RC Rin Ai = iout/iin iout = - bib iin = ib Ai = - b AV = Vout/Vin Vout = - bibRC Vin = ib(Rs + Rpi) AV = - bRC/ (Rs + Rpi)

Common emitter with RE amplifier ac equivalent circuit

Common emitter with RE amplifier ib iout Rin Rin = V/ib V = ib Rpi + (ib + bib)RE Rin = Rpi + (1 + b)RE (usually large) + Vout - + V - ib + bib Rout Rin AV = Vout/Vin Vout = - bibRC Vin = ib Rs + ib Rpi + (ib + bib)RE AV = - bRC/ (Rs + Rpi + (1 + b)RE) (less than CE, but less sensitive to b variations) Ai = iout/iin iout = - bib iin = ib Ai = - b Rout Rout = RC

Common collector (emitter follower) amplifier b c e + vout - (vout at emitter) ac equivalent circuit

Common collector amplifier ib + V - Rin Rin = V/ib V = ib Rpi + (ib + bib)RL Rin = Rpi + (1 + b)RL + vout - ib + bib Rin AV = vout/vs vout = (ib + bib)RL vs = ib Rs + ib Rpi + (ib + bib)RL AV = (1+ b)RL/ (Rs + Rpi + (1 + b)RL) (always < 1)

Common collector amplifier ib Ai = iout/iin iout = ib + bib iin = ib Ai = b + 1 + vout - ib + bib Rout Rout (don’t include RL, set Vs = 0) Rout = vout /- (ib + bib) vout = -ib Rpi + -ibRs Rout = (Rpi + Rs) / (1+ b) (usually low)

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