PART I (Calculating bandwidth) a) [P,C] Draw small-signal equivalent circuit of the amplifier in the form suitable for l

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Part I Calculating Bandwidth A P C Draw Small Signal Equivalent Circuit Of The Amplifier In The Form Suitable For L 1 (42.4 KiB) Viewed 41 times

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Part I Calculating Bandwidth A P C Draw Small Signal Equivalent Circuit Of The Amplifier In The Form Suitable For L 2 (23.38 KiB) Viewed 41 times

PART I (Calculating bandwidth) a) [P,C] Draw small-signal equivalent circuit of the amplifier in the form suitable for low frequency. [5 marks] b) [P,C] Calculate the lower 3dB frequency, få, of the amplifier using the appropriate time constant method. [15 Marks] c) [P,C] Draw small-signal equivalent circuit of the amplifier in the form suitable for high-frequency analysis. [5 Marks] d) [DN]*Calculate the higher 3dB frequency, fí, of the amplifier using the appropriate time constant method. [15 Marks]
The three-stage amplifier consists of one n-channel MOSFET transistor M1 in depletion mode with W/L = 1 and two BJT transistors Q1 and Q2. The transistors have the model parameters as provided in the table below Transistor Parameters M1 K₁ = 10mA/V²| VIN=-2V Q2 B=150 Q3 B=80 VA = 80V VA = 60V λ=0.02V-¹ VBE = 0.7V VBE = 0.7V Cgs = 3.5pf, Cgd = 0.1pf f₁= 2GHz, C₁= 0.2pf fT2GHz, Cu= 0.2pf
R₂ 10K C₁ 10μF RG 1M V₂ RD2 0.62K www M₁ R$1 0.2K R₁ 78K 10μF R₂ 22K C₂ 10μF www RE₂ 1.6K Rc₂ 4.7K R3 91K Q2 C5 10μF R4 120K -C4 10μF www Q3 RE3 3.3K Fig. 2: A three-stage transistor amplifier +15V C610μF R₁ 0.25K