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’.
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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 C2 Rs Vs C1 R2 R1 RE VCC RC RL C3
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Small-Signal Operation
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Output Swings Limited by Saturation
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DC Equivalent Circuit Short ac voltage sources Open ac current sources Open capacitors Use for dc analysis (dc Q point) RC R2 R1 RE VCC C2 Rs Vs C1 RL C3
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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
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Activity 1 - solution
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Unformatted text preview: 10 V 8 k Ω 1 k Ω 1 mV 10 k Ω 1 mA 1 AC Equivalent Circuit Short dc voltage sources Open dc current sources Short capacitors Use for ac analysis (gain A, R in , R out ) RC Vout Vs Rs Rin A=Vout/Vin R2 R1 Vin RL Rout C2 C1 RE VCC C3 1 T-Model General model ac resistances ac α and β Simplified model I I b c ac = β I I e c ac = α C rc' Ic E rb' B re' Ib Ie C Ic E B re' Ib Ie 1 AC Emitter Resistance Formula: Link between dc and ac analysis ac β vs. dc β re mV I E ' = 25 1 Activity 2 For the transistor amplifier whose dc characteristics were studied in activity 1 Show the ac equivalent circuit Show the ac equivalent circuit in which the transistor is replaced by the T model Compute r e ’ 10 V 8 k Ω 1 k Ω 1 mV 10 k Ω 1 mA 1 Activity 2 - solution 10 V 8 k Ω 1 k Ω 1 mV 10 k Ω 1 mA...
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This note was uploaded on 04/04/2010 for the course BME 302L taught by Professor Maarek during the Spring '08 term at USC.

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Lesson 8 2010 small signal transistor amplifiers with activities

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