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ECE231 - 2008 - Term Test 2 Solutions

# ECE231 - 2008 - Term Test 2 Solutions - ECE23IS —...

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Unformatted text preview: ECE23IS — Introductory Electronics Midterm Examination 2 Lecturers — K. Phang, R. Genov Date — Friday, March 28, 2008 Duration: 50 minutes 1. Answers should be written in non—erasable pen. Warning: answers written in pencil may be considered ineligible for remarking. 2. The marks for each question are indicated within bracketsﬂ. Place your ﬁnal answers in the boxes where given. 3. Show your work: answers without justiﬁcation will not receive full marks! 4. Use back sides of sheets if necessary. Extra sheets are also provided at the end. 5. Aids: any calculators (including programmable ones) and the equation sheet at the end. sOtt/trmrrg. amgwewmmnnsmmmwmmw Last Name: First Name: Student #: Circle your regular tutorial room: HA401 /HA410 / BA2145 / 2155 / 2165 / 2175 / 2185 / 2195 page 1 of7 Last Name: Question 1: [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, vouﬁr), on the graph below for the given input voltage, VINH). Mark all of the important points on your graphs. 4 / « "1N VIN- VOUT (V? page 2 of 8 Last Name: Question 2: [5] For the circuit shown below find the cun‘ents through all diodes (1], 12, [3) assum- ing all diodes are ideal (i.e., VD=OV when conducting). +40V page 3 of 8 Last Name: Question 3: [5] Assume that for both transistors Q1 and Q2 tLPCOX=50uA/V2, thz—OVV, X20, Assume also that the gate of transistor Q1 has width W1:1Ottm and length L1=O.5um, and that the gate of transistor Q2 has width WZZSHID and length L2=O.5um. Find the value of currents I D I, and 102- Way a! miaﬁ‘i’e‘isrii'awﬁ v 409‘ «LQL WSﬁtglfs“ VJDS'SV 5V [0 f OIS D2 “L l \/ 69. 3 l.15k.Q 3kg" 1 W/ i Q ( ID, : :2: AA} (arch/r Vs; Mgr—L.th \/U\ J [D " W} *" V0.29 \ (W/ ’ ' "L Vol 7 “WV/(fly toy ’lU’ J0 vVDD) page 4 of 8 Last Name: Question 4: [1;] For the amplifier shown below replace transistor with its T equivalent circuit (ignore r0). Assume viis an AC signal source with zero DC bias. Derive the expressions for the voltage gains vj/vl- and val/vi. 15V l3: 6169 VII 3—4 Q1 vi VS T 3kg) (2; }‘_W {Val /’/l\\ we W l Ugh :V; _ 13*" “W " v; “A “M”: 7., 4,7 a 314. v“ \p m “ 7r {la page 5 of 8 ...
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