ece231s_2008_exam - ECE231S — Introductory...

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Unformatted text preview: ECE231S — Introductory Electronics (2008) Final Examination Lecturers — R. Genov, K. Phang Date - Wednesday, April 23, 2008 Duration: 2 hours 30 minutes I. Aids: One hand—written, double—sided, letter-sized, aid—sheet and any type calculator is allowed. 2. You may write in pencil. 3. The marks for each question are indicated within bracketsfl. Place your final answers in the boxes given. 4. Show your work: answers withoutjustification will not receive full marks! 5. Use back sides of sheets if necessary. Extra sheets are also provided at the back. Question Marks ———————L—————J l /5 2 /5 3(a) /l 3(b) / 4 Last Name: 3(C) /5 ~ 4 /5 5 /5 First Name: Total Student #: /30 Question 1: [’5] Assume the opamp has an infinite DC open loop gain and a unity-gain bandwidth of lOGHz. Sketch the amplitude and phase responses of this circuit. Clearly label numerical values for all key points on the graphs. Assume RlleQ , R2=19MQ , R3=lMQ and R4=IMQ. A IWVII. dB 7% 10g09 pageZ of II Question 2: [5] For the circuit shown below assume the “ON” diode voltage is 0.7V. Draw a transfer characteristic of this circuit. Also, sketch the output voltage, VOL/7U), on the graph below for the given input voltage, v,N(t). Mark all of the important points on your graph. VOL/T 1 k0 VIN“) 1kg2 VOUflt) VIN) VOUT (V) page3 ofll Question 3: [10 marks total] W An amplifier Circuit is shown below. For the MOSFET, assume ttnC0X(—L") = 2mA/ V2, 71 IV,| = 2V,and?t = 0. 15V 15V 6M9 4M9 vm vsi l» C = 00 _ RIN 4M9 ZkQ a) [1 mark] Circle which type of single-stage amplifier is represented by this circuit: Common—source Common- gate Common-drain page4of ll Question 3 (cont) b) [4 marks] Find the DC drain current of Q1 and the DC voltage at the output. page 5 of H Question 3(cont.) c) [5 marks] Draw the small-signal circuit using the T-model of the MOSFET. Assuming that Q1 has transconductance gm=2mA/V, calculate the small—signal voltage gain, vout/ vi”, input resis— tance, and output resistance of this circuit (NOTE: Vm is not the same as vsig). page6of ll Question 30) (extra sheet) page70f11 Question 4: [5] For the circuit shown below, find the voltage at the base, collector, and emitter. Assume B = 50 , and lVBEl = 0.7V. 5V l.6k.Q 22 k0 page8of ll Question 5: [10] The transistor amplifier shown below is biased with an ideal current source. Draw the small—signal circuit using the T-model, and calculate the small-signal gain Vouz/ vsig. Assume [3 = 50, V35 2 0.7V, and ignore the Early Effect. 5 V 7.5 k0 voul C : 00 R = 50.0 sig i? vsfg page 9 of H Extra page 1. page 10 of 11 Extra page 2 pagellofll ...
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