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Unformatted text preview: ESE 372/Spring 2009
HW3 (problems are taken from recommended book) Due: March 5‘".
Part 1 (corrections to HW2) D2.12. Using an ideal op amp, what are the values of the resistors R1 and R2 to be used to
design ampliﬁer with the closedloop gains listed below. In your design, use IOkQ as a value of
one resistor. Value of the other resistor should be equal or larger than lOkQ. D233. Assuming the op amp to be ideal, it is required to design the circuit below to implement
current ampliﬁer with gain i_load/i_in=20 A/A. (a) ﬁnd the required value for R; (b) if RL=1kQ and the op amp operates in an ideal manner so long as V_out is in the range ilZ V.
What range of i_in is possible? mm RI. la; 1" W30“: 3> Molina/3‘ c {5% < Qle1 A.‘ 2.62. For the circuit below express v_out as a function of v_1 and Vw2. What is the input resistance seen by V_1 alone? By v_2 alone? By a source connected between the two input
terminals? By a source connected between the two terminals simultaneously? 1'? I?
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loop gain of +100V/V. What 3dB bandwidth resul LOGK
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\OO .1. ._..— 206w%% D2.125. Consider circuit below. Derive the transfer function. Plot the magnitude response. Show
that the high—frequency gain is ~R2/Rl and 3dB frequency is coo=l/(C*Rl). Design the circuit to obtain a highfrequency input resistance of iOkHz, a high—frequency gain of 40dB, and 3dB
frequency of ikHz. 15v. 3.13. A square wave of 6—V peak—to—peak amplitude and zero average is applied to a circuit
below with R=100Q What is the peak output voltage that results? What is the average output
voltage that results? What is the peak diode current? What is the average diode current? What is
the maximum reverse bias voltage across the diode? 3.19. A diode for which the forward voltage drop is 0.7V at ImA and for which n= 1 is operated
at 0.5V. What is the value of the current? Fovzxwﬁﬂb «33M XL \A:\ Ti e: Egg/WWW) Wiw 2 ZS‘WV" 3.78. A full—wave bridge rectiﬁer circuit with a IkQ load operates from a 120V (rms) 60Hz
household supply through lOto—l step—down transformer having a single secondary winding. It
uses four diodes, each of which can be modeled to have a 0.7V drop for any current. What is the
peak value of the rectiﬁed voltage across the load? For what fraction of the cycle does each
diode conduct? What is the average current through the load? Q.w_gr.m.W.—. wwwwwwwww WW... wwwwwwwwww “a w / I); y( n:
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voltage 1:": \ R x/ \‘ "/ \/ \fﬁMc’,‘ 3.85. Augment the rectiﬁer from problem 3.78 with a capacitor chosen to provide a peaktopeak
ripple voltage of 10% of the peak output. What average output results? Sketch the load voltage as a function of time with and without capacitor. Indicate on the plot the periods when capacitor
is being charged and discharged. ...
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 Spring '08
 Kamoua,R
 Rectifier, Switchedmode power supply, Electrical resistance

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