New L Ill Nf Rim Wen Eekw 51104 Limle Efaen Ea Mlej Ti J Lwwlmeww Question 1 60

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Consider the amplifier circuit shown in Figure 1, comprising of one MOSFET transistor Q1 with W/L = 16 and one BJT transistor Q2. The transistors have the small signal model parameters as provided in the information sheet.

dentify the amplifier configuration used in each stage of the amplifier. [1 mark] b) Show that the DC biasing drain currents in transistor Q1 and Q2 are ID1 = 0.635mA and IC2= 2.65mA respectively. [5 Marks] c) Calculate the transistor model parameters for each transistor, namely gm1, gm2, and rπ2. [3 Marks] d) Comment on the possible range of resistance values that may replace the 10K, drain resistance, of the MOSFET transistor in the amplifier. [4 Marks] e) Draw small signal equivalent circuit of the amplifier in the form suitable for low frequency analysis. You may assume the CS is large enough to be treated as short circuit even at low frequencies. [4 Marks] f) Calculate the lower 3dB frequency, fL, of the amplifier using the appropriate time constant method. [5 Marks] g) Calculate the mid-band voltage gain of the amplifier. [5 Marks] h) Draw small signal equivalent circuit of the amplifier in the form suitable for high frequency analysis. You may assume the CS is large.

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new l Ill-NF) Rim) WEN) EEKW) \$51104) limle‘eﬂfaen’eaé mlEJ’ti-J lwwlﬁmeww QUESTION 1 [60 Marks] Consider the ampliﬁer eii-enn shown ih Figure 1, comprising ofone MOSFET transistor Q1with W1 = 16 and one BIT transistor Q2. The transistors have the small signal modelparameters as provided in the information sheet. 10V Figure 1 Identify llie anipliﬁei eonﬁgniation used in eaela stage ofthe ampliﬁer. [1 mark]Show that the DC biasing chain currents in transistor Q1 and Q2 are Inl : 0 635mand 1m: 2 esnna respectively. [5 Marks]Calculate the transistor model pammeteis for each tmnsistm. namely gml. gm; and r“;[3 Marks]Commem on the possible range of resistance values that may replace the IOKQ, drainresistance. oflhe MOSFET Lmusismr in the ampliﬁer. [4 Marks] Draw small sigml equivalent circuit of the nmyliﬁer in the form suitable for lowfrequency analysis. You may assume the C5 is large enough to be healed as shortcircuit even at low frequencies. [4 Marks]Calculate the lower sill: frequency. ft. of the ampliﬁer using the appi-opiiale limeconstant method. [5 Marks] 3) Calculate the mid-band voltage gain of the ampliﬁer. 1.3mm x Mose kmlnl PmMﬁi PDF Xﬂﬁ‘ﬁﬂxtwﬁlﬁ EEDEEH 2e . am PDFV Elise PM (El

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