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lesson 8 2010 small signal transistor amplifiers with activities

# Lesson 8 2010 small signal transistor amplifiers with activities

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Small-Signal Transistor Amplifiers

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Small-Signal Transistor Amplifiers Objective: after learning this section, you will be able to: Use the proper notations for ac transistor currents and voltages; Explain small-signal operation; Derive the dc and ac equivalents of a transistor amplifier circuit; Represent the general and the simplified transistor T-model; Compute the ac emitter resistance re’.
AC Quantities Peak and rms quantities: V ce , I c ,... Instantaneous quantities: v ce , i c ,...

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Small-Signal Amplifier Coupling capacitor Bypass capacitor C 2 R s V s C 1 R 2 R 1 R E V C C R C R L C 3
Small-Signal Operation

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Output Swings Limited by Saturation
DC Equivalent Circuit Short ac voltage sources Open ac current sources Open capacitors Use for dc analysis (dc Q point) R C R 2 R 1 R E V C C C 2 R s V s C 1 R 2 R 1 R E V C C R C R L C 3

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Activity 1 For the transistor amplifier on the right Show the dc equivalent circuit Use the dc equivalent circuit to compute the Q point (I C and V CE ) 10 V 8 k 1 k 1 mV 10 k 1 mA
Activity 1 - solution 10 V 8 k 1 k 1 mV 10 k 1 mA

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