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# exam1sol - Utah State University page 1 of 5 ECE 341 0...

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Unformatted text preview: Utah State University page 1 of 5 ECE 341 0 - Microelectronics I Midterm 1 Student’s Name: 50 ( (05L \074 5 QUESTION 1 (10 pts) The weighted—summer, shown at right, has the following parameters: RF =10k£2 R1 =1k§2 R2 = 5kg R3 = 4kg A. Assuming the op amp is ideal and has inﬁnite gain, ﬁll in the blanks: v0 " ‘0 V1 + ” g V2 B. Now suppose the op amp has ﬁnite gain A=100 VN. Fill in the blanks: - we m + - L73 V2 + “1‘15? 123 V0 um m University mind's _ EEE 34W- “Inmlmrﬁu I Iliilzann‘l ﬂﬂEEﬂﬂHj {2a pm} An op amp has a DC gain of 105 HEN and a unity-gain freq uenw of lﬂMHz. A. “Math the breakfrequency, wk 1' 535 = ELF (Tia/9:: 5‘ 10 HE ammumup amp's gninin dB. and drauitandaphtnnﬂraamh-abw. Lah-alﬂdﬂ. ADE [dB-l .ﬂ-Jﬁ .and whandgivanunarinalﬂmfu'a-adl. IA}: = [JD :13 Utah Elm Unmm‘w m3 ufﬁ EGE 3-110 - “mmmﬁ I Ilidtarm‘l tut-31' 43-m— EIMLT- 9141‘ 'F‘ﬂ‘} .-' ~ ~ ~ . 1:,“ 33:5! .14.: 1:. Hpmﬁunpmnhmmlnmemﬁmmﬂnnsmnm --= Bintﬂilatﬂmult. "auratn '35” mntfurtha up ﬂnp'a fl1ila 93'“. W’ um ‘41: ' EDIT Utah State University page 4 of 5 ECE 341 0 - Microelectronics I Midterm 1 QUESTION 3 (20 pts) An op amp has rails at iIOV and a slew rate of 0.25 V/us, and is used in a circuit conﬁgured to have a gain MW. 3.14. "/V , A. What is the full-power bandwidth, CUM ? w = fﬁ" 7: 629 kiwi-9c 7‘ 3.78 kHz V‘ 0W B. A signal is input to the ampliﬁer with the spectrum shown on the axes below. On the same axes, draw the output signal spectrum, and plot the saturation and slew-rate distortion limits. Label Vomax (in dB) and (0M . Will this sig~ nal experience any distortion? If so, what kind? There w;// be, Satmiﬁ'w Jr‘sfﬂm‘i‘oﬁ V(dB) SR élisrhor‘Hov/L . 4O 3O 20 10 104 105 1o6 7 8 Frequency (Hz) Utah State University page 5 of 5 ECE 341 0 - Microelectronics I Midterm 1 QUESTION 4 (20 pts) Design the difference ampliﬁer, shown below, to have a closed—loop gain of 10 V/V. Give R1, R3 and R4 if the op amp has'inﬁnite open—loop gain. Then solve for R1, R3 and R4 if the op amp has ﬁnite open—loop gain A=100 V/V. Out of impedance matching considerations, your design is also required to satisfy R3 + R4 = R1. Inﬁnite Gain R1: H90 5L R3: 61-0%» Vin _ + R4: 610.6152 Finithain R1: 39A .2 ...
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