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EKT104 ANALOG ELECTRONIC CIRCUITS [LITAR ELEKTRONIK ANALOG] BASIC BJT AMPLIFIER (PART III) DR NIK ADILAH HANIN BINTI ZAHRI adilahhanin@unimap.edu.my.

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Presentation on theme: "EKT104 ANALOG ELECTRONIC CIRCUITS [LITAR ELEKTRONIK ANALOG] BASIC BJT AMPLIFIER (PART III) DR NIK ADILAH HANIN BINTI ZAHRI adilahhanin@unimap.edu.my."— Presentation transcript:

1 EKT104 ANALOG ELECTRONIC CIRCUITS [LITAR ELEKTRONIK ANALOG] BASIC BJT AMPLIFIER (PART III)
DR NIK ADILAH HANIN BINTI ZAHRI

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

3 COMMON-COLLECTOR AMPLIFIER
vO Common collector circuit (Emitter-follower) Small-signal equivalent circuit (using transconductance parameter)

4 COMMON-COLLECTOR AMPLIFIER - SMALL-SIGNAL ANALYSIS: VOLTAGE GAIN-

5 COMMON-COLLECTOR AMPLIFIER - SMALL-SIGNAL ANALYSIS: VOLTAGE GAIN-
Example 1: Given Rs=0.5kΩ, R1=50kΩ,R2=50kΩ,RE=2kΩ, VCC=5V, β=100, VBE(on)=0.7V and VA=80V. Calculate the small signal voltage gain of the common-collector circuit.

6 COMMON-COLLECTOR AMPLIFIER - SMALL-SIGNAL ANALYSIS: VOLTAGE GAIN-
Example 1: Given Rs=0.5kΩ, R1=50kΩ,R2=50kΩ,RE=2kΩ, VCC=5V, β=100, VBE(on)=0.7V and VA=80V. Calculate the small signal voltage gain of the common-collector circuit. (Ans:ICQ=0.8mA,VCEQ=3.4V ,AV=+0.964)

7 COMMON COLLECTOR AMPLIFIER -Output Impedance(Output Resistance,Ro)-
Test Current Test Voltage Small-signal equivalent circuit (using transconductance parameter), assuming source resistance, Rs to be zero The output impedance analysis on the next slide is based on this circuit.

8 COMMON COLLECTOR AMPLIFIER -Output Impedance(Output Resistance,Ro)-
Vπ=-VX Let; Test Voltage Test Current

9 COMMON COLLECTOR AMPLIFIER -Output Impedance(Output Resistance,Ro)-
Example 2: Given the following circuit (same as Example 1), calculate the input and output resistance. Assume the transistor & circuit parameter are;β=100, VCC=5V, VBE=0.7V, VA=80V and ro=100kΩ.

10 COMMON COLLECTOR AMPLIFIER -Output Impedance(Output Resistance,Ro)-
Example 2: Given the following circuit (same as Example 1), calculate the input (Rib & Ri)and output resistance (RO). Assume the transistor & circuit parameter are;β=100, VCC=5V, VBE=0.7V, VA=80V and ro=100kΩ. (Ans:Rib =201.3kΩ ,Ri=22.2kΩ, RO=31.6 Ω)

11 COMMON-COLLECTOR AMPLIFIER - Small-signal Analysis: Current Gain-
where If R1R2  Rib and ro  RE then Ai  (1+)

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

13 COMMON-BASE AMPLIFIER - Circuits-
Common-base circuit Small-signal equivalent circuit

14 COMMON-BASE AMPLIFIER - Small-signal Analysis: Voltage Gain-
If RS approaches zero, then Av = gm(RC||RL)

15 COMMON-BASE AMPLIFIER - Small-signal Analysis: Current Gain-
If RE approaches infinity and RL approaches zero, then;

16 COMMON-BASE AMPLIFIER - Small-signal Analysis: Input Impedance-
Input resistance Ii Ib Rie Input resistance Rie = re =

17 COMMON-BASE AMPLIFIER - Small-signal Analysis: Output Impedance-
Output resistance Ro Ix Vx Output resistance Ro = RC

18 SUMMARY & COMPARISON Configuration Common Emitter Common Collector
Common Base Voltage Gain Av > 1 Av  1 Current Gain Ai > 1 Ai  1 Input Resistance Moderate (kΩ) High (50-100kΩ) Low (Ω) Output Resistance Moderate to High


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