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Sol_ELCT_371_Quiz2 - Quiz 2 ELCT 371 Electronics Time 35...

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Unformatted text preview: Quiz 2 ELCT 371: Electronics Time: 35 mins. Total points: 35 NOTE: No books, notes, solutions, drawings allowed. Calculators are permitted. If proper intermediate steps are not show, points will be deducted. NAME: 1. The amplifier shown in Fig. 1 is rated for output voltages of i 12V, and source/sink current of 20 mA. Also assume R1 = 2 K9, and R2 = 10 K9. (2 + 2 + 2 + 2). (i) Mention two major limitations to the output voltage of an op-amp. 5% l) 97 v0 Urnjfi Luv Mime» ,' 0/), own ewt- fiLl/C’ffiil‘ow S L244) Y‘ m MLLVl‘etiCOv, s, (ii) Determine the maximum input voltage possible to apply without output voltage distortion if RL = 2 K9 :0; U0 __e VD RV Rk-PKL, Bmvo:12u :0 < 20w»: aVOIMH-+ GM“ ” [" (22/2! ' 1+ ‘0 ; g 1 '2/ \JL;k i120 i 2U (iii)Determine the maximum input voltage possible to apply without output voltage distortion if RL = 200 Q. Fm” 12L: 900$, u “' 0.2mm, + Qo+),>|/L.n: A0 W “00¢th WMog/E = 9/0 X ixzv 66 c 3 éZéV \ -—_‘ V ' Uwfw ‘— fl :1— 8 €36=O.gogv' Au é (iv)What is the power gain of the amplifier? g: Mt; KL: to - $155 11¢ ' ET“) 87’0”“5944 XWU (>0 I M “(Q/USHU/QLY Vela LLB/u) G M V0140 Lava/l» ,OV‘ Adeg/Ua Glace) 2. Find the output voltage for each of the following amplifiers. Employ summing point constraints. Show fl steps. Points will be deducted if steps not shown (2 + 2 + 2 +2 +2). V0 : o— ZwAK \LLJL/ : v-ZV 00 = 5—. zwgkx'suw, —:. (\V V0: 4'" : 3V V0 —; 0— DKISILW =OV 3. (a) Draw the circuit for a unity gain amplifier (voltage follower). (b) Draw the circuit for a Schmitt Trigger (5) 5. A certain op-amp has open loop gain AO’OL = 105 and a open loop bandwidth prL = 50 Hz (a) Calculate ft for the amplifier? (b) Draw the Gain Bode Plot for the op-amp in the open loop case. Clearly point out the dc gain and the break frequency in the y and x axes, and relevant slopes. (c) If the op amp is to be used as a audio amplifier, with ability to provide constant gain up to 20 KHz under closed loop condition (remember in this case you have to use some combination of R1 and R2), what should be the gain of the amplifier in dB? Assume non-inverting connection. ((1) Draw the Bode gain plot of the amplifier under the closed loop condition mentioned in (b). Clearly point out the dc gain and the break frequency in the y and x axes and relevant slopes. _.. __ s n, (a) .{Q _, A0,” xqegm, __ 10 X 30 (2+2+2+2) Cb) 32¢ Kurt/lav“ : ‘SXHSé Hz, :1 S MHZ 9,6)er6 Ao,oL '3 20 RD. {09 : (00%, LC) Abra. 2 ”gt ‘9 “10’ 5'82“" zoxm ll SJ 5 dB gain (00 ’20 QUE/abet, / ...
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