DEE, CEME, NUST EE 313 Electronic Circuit Design

Lab 2: High Frequency Response of Common Source and Common Emitter Amplifier

Conducted on: Submitted on:

Group Members

Aim Understanding low frequency response of common source amplifier

Theory1) Topic 9.2-9.5 of Microelectronic Circuits 6th edition by Sedra Smith

Components RG1=47M , RG2= 10M , RE=2.2k , RS=2k ,1K,3K,4K, RL=10k , R1=68k , R2= 27k

,RE=2.2k ,Rc=4.7k ,RL=10k , 2N7000 transistor,2N3904 transistor

Task Breakdown Marks a) Simulation 3b) Implementation 7

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DEE, CEME, NUST EE 313 Electronic Circuit Design

ExplanationCommon Emitter AmplifierPre lab

1) For the circuit in Figure 1 write expressions for Av, and fh

Figure 1: Common Emitter Amplifier

2) Draw small signal model for high frequency signal3) Calculate mid band gain and upper 3db frequency considering

following specifications of circuit R1=68k , R2= 27k ,RE=2.2k Rc=4.7k,RL=10k , Determine Cπ, Cμ and rb of the transistor 2N3904 from the PSPICE Model Cπ, Cμ and rb are listed as CBE, CBC and RX.

4) Simulate the circuit and find mid band gain and upper 3db frequency5) If 3db frequency of signal is higher than the max frequency signal of function generator

Use discrete components for the purpose of just showing the high frequency effect of capacitances

Lab Procedure6) Implement the circuit and find midband gain and upper 3dB frequency.

f(Hz) V0 Av Gain in dB

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DEE, CEME, NUST EE 313 Electronic Circuit Design

7) Draw graph for freq vs gain

Common Source AmplifierPre lab

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DEE, CEME, NUST EE 313 Electronic Circuit Design

1) For the circuit in Figure 2 write expressions for mid band Av, and fh

Figure 2: Common Source Amplifier

2) Calculate mid band gain and upper 3db frequency considering following specifications of circuit RG1=47M , RG2= 10M , RE=2.2k ,RS=2k , RL=10k , Determine Cgd and Cgd of the transistor 2N700 from the PSPICE Model

3) If 3db frequency of signal is higher than the max frequency signal of function generatorUse discrete components for the purpose of just showing the high frequency effect of capacitances

4) Simulate the circuit and find mid band gain upper 3db frequency and gain bandwidth product(for RS=1k , 2k and 3k )

Lab Procedure5) Implement above circuit in hardware and verify Av (midband gain) ,upper 3db frequency and gain bandwidth product (for RS=1k, 2k and 3k )

f(Hz) V0 Av Gain in dB

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DEE, CEME, NUST EE 313 Electronic Circuit Design

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