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ANALOG ELECTRONIC CIRCUITS 1

ANALOG ELECTRONIC CIRCUITS 1. EKT 104 Basic BJT Amplifiers (Part 3). COMMON-COLLECTOR AMPLIFIER. SMALL-SIGNAL VOLTAGE GAIN INPUT AND OUTPUT IMPEDANCES SMALL-SIGNAL CURRENT GAIN. Common-collector Amplifier - Circuits. v O. Common collector circuit (Emitter-follower).

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ANALOG ELECTRONIC CIRCUITS 1

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  1. ANALOG ELECTRONIC CIRCUITS 1 EKT 104 Basic BJT Amplifiers (Part 3)

  2. COMMON-COLLECTOR AMPLIFIER SMALL-SIGNAL VOLTAGE GAIN INPUT AND OUTPUT IMPEDANCES SMALL-SIGNAL CURRENT GAIN

  3. Common-collector Amplifier- Circuits vO Common collector circuit (Emitter-follower) Small-signal equivalent circuit (using transconductance parameter)

  4. Common-collector Amplifier - Small-signal Analysis: Voltage Gain, Impedance

  5. Common Collector Amplifier-Output Impedance The output impedance analysis on the next slide is based on this circuit. Small-signal equivalent circuit (using transconductance parameter)

  6. Common collector amplifier-Output impedance Let;

  7. Example • Calculate • the small signal voltage gain, • the input and output resistance. • Assume the transistor & circuit parameter are;β=100, VCC=5V, VBE=0.7V, VA=80V and ro=100kΩ.

  8. Common-collector Amplifier- Small-signal Analysis: Current Gain Current gain where If R1R2  Rib and ro  RE then Ai  (1+)

  9. COMMON-BASE AMPLIFIER SMALL-SIGNAL VOLTAGE GAIN INPUT AND OUTPUT IMPEDANCES SMALL-SIGNAL CURRENT GAIN

  10. Common-base Amplifier- Circuits Common-base circuit Small-signal equivalent circuit

  11. Common-base Amplifier- Small-signal Analysis: Voltage Gain Voltage gain If RS approaches zero, then Av = gm(RC||RL)

  12. Common-base Amplifier- Small-signal Analysis: Current Gain Current gain If RE approaches infinity and RL approaches zero, then;

  13. Ii Rie Ib Common-base Amplifier- Small-signal Analysis: Impedance Input resistance Input resistance Rie = re =

  14. Ro Ix Vx Common-base Amplifier- Small-signal Analysis: Impedance Output resistance Output resitance Ro = RC

  15. Summary & Comparison

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