Question

Homework 4 Due: June 26, 2019, at 5 pm. Note: Show all steps required to get to your answers and make sure to box them. Writing down answers to questions asked without any explanation(s) will not do it. Clarity should be a priority Moreover, the assigned textbook for this class is Sedra and Smith, Microelectronic Circuits, Seventh Edition, Oxford University Press. Make sure you have the proper book Reminder: In class, we have expressed the overall voltage gain of a (BJT or MOSFET) amplifier as A,p(s) AMFL(sF#(s) = Problem 2: Consider the CS amplifier shown on Figure P2.1. It contains a transistor Q1, whose characteristics are 4/y2. Cgs 100 MA Vt 2 V, k 12.30 pF, and Cgd = 27.400 pF = V1 12V R2 2880170 R4 10000 C2 2.2uF Q1 C1 Vout R1 2N7000 10000 2.2pF R6 100000 C3 Vsig R3 1531860 33HF R5 3030 Figure P2.1 As you can see on Figure P2.2, simulation of the DC circuit in Multisim results in an operating point 6.010 mA) Орoint V Ds 3D4.169 V, I, V1 12V R22880170 R4 1000Q : 8.01 mA. l(p-p): 0 A I(rms): 8.01 mA PR1 XMMI mA (freg):- 01 ( 2N7000 Multimeter-XMM1 4.169 V R3: 1531860 R5 3030 Set.. Figure P2.2 What type of transistor is Q1 on Figure P2.1 (or Figure P2.2)? Consider mid-band frequency operation. 1. 2. Draw the overall small-signal equivalent circuit of the amplifier circuit operating at mid- band frequencies. а. Vout Derive its mid-band frequency voltage gain A Ам b. Vsig Consider low frequency operation 3. Draw the overall small-signal equivalent circuit of the amplifier circuit operating at low а. frequencies b. Using the Short Circuit Time Constant (SCTC) method, derive the low cutoff frequency = "L(in Hz). Note that this involves finding the frequency poles (in Hz) fL,f2, and f3 27T fL respectively caused by the coupling capacitors C1, C2, and C3. Consider high frequency operation. 4. Draw the overall small-signal equivalent circuit of the amplifier circuit operating at high frequencies b. Using the Open Circuit Time Constant (OCTC) method, derive the high cutoff frequency a. (in Hz). Note that this involves finding the frequency poles (in Hz) fH, and fH 2TT = respectively caused by the device capacitors Cgs and Cgd Now, given your knowledge of AM, fi the voltage gain A, as a function of s = a +jw. Design questions: or w, and f or wH, Write out the overall expression of 5. 6. Say that we desire fi,

Answer 1

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