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Test_1_Solutions

Test_1_Solutions - EE2230 Test 1 Name Z/EA dflfl/l...

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Unformatted text preview: EE2230 Test 1: 9/24/04 Name {- Z/EA dflfl/l 7/Zl’f/ 1 Directions This test contains 6 problems. You must work any 5 of them. Clearly indicate the problem you do not wish to work by making a large “X” across the page containing the problem. Alternatively, you may choose to work a 6th problem and mark the page in large print with the word “BONUS”. There will be no partial credit or discussion for the bonus problem, and no guarantees are made as to its ultimate worth. If no problem is crossed out or marked bonus, the first five problems will be graded without exception, even if one of the first 5 is blank. You have 50 minutes to complete this test. Do not spend excessive time on any one problem. Each problem will be weighted equally at 20 points excluding the bonus. Partial credit will be given for partial knowledge. Provide answers in indicated spaces where applicable. Problem 1 Problem 2 ‘ Problem 3 Problem 4 Problem 5 Problem 6 Total Please sign below indicating you understand and accept the directions. Unsigned tests will not be graded. Signature EE2230 Test 1: 9/24/04 Name 2 1. Complete the design of the full wave power supply below by choosing a capacitor value and transformer ratio. Assume a 60 Hz power source and a maximum load current of 100 mA. Assume Vf = .7V and rd = 0. (20 pts) Figure 1: Full Wave Power Supply V“... ' MK!) 2 5 «-> Am 2_ {V (Adlft VJ 3 [0y .9 ’V/‘A/f : /%-’/7.'/ Voux -: £6 / g:£(' iii“ ( z 32IAF EE2230 Test 1: 9/24/04 Name 3 2. The circuit below contains two diodes, 3. PN junction diode with Vf = .7V, and a Schottky diode with Vf = .3V. Solve for both diode operating points. Assume neither diode has any resistance. (20 pts) 1kQ 1kQ EE2230 Test 1: 9/24/04 Name 4 3. Create a transfer function for the circuit below using a piecewise linear model consisting of an improved diode resistance and forward voltage. Label all relevant points. Assume an input range of 10V to -10 V. (20 pts) '01 have ID V,,. <*:7 5h "#7 [k 14 V/n "’ ’4‘“ VA 1.! ”I Vi :14“)! ,r/ I ,5 I /' Chg/pro 11 an; m. r 24%; =2? (11:25: N 7' I (9‘34, |). jXfi’JI-J) ,ug VI" 03; u [I EE2230 Test 1: 9/24/04 Name . 5 4. Consider the zener diode in figure 4. Assume Vf = .7V and rd 2 O. (a) What source voltage places the zener diode on the border between cutoff and forward biased operation? (5 pts) (b) What source voltage places the zener diode on the border between cutoff and reverse breakdown? (5 pts) (c) What is the maximum positive current in the 10 k9 resistor as labeled? (5 pts) (d) 'What is the maximum negative current in the 10 k9 resistor as labeled? (5 pts) 1kQ EE2230 Test 1: 9/24/04 Name 0': 5. Choose the correct transformer ratio and capacitor to create a 5V supply with a maximum ripple voltage of 2.5%. Assume Vf = .7V and rd = O. (20 pts) 12“ms 0 VI 1“" Vout _m N1 :N2 Figure 5: Half-Wave DC Supply 1%,}: 55025) —" ,/.z:V ,ya. ediif’j'e '57?" c = (SEA/C K7 2 5.7% ’47,: 2 gift] {.7 EE2230 Test 1.- 9/24/04 Name 7 6. Consider the square law device in figure 6. Answer the following questions about the devioe. (a) What is the device operating point? (15 pts) (b) What is the approximate value of VTR? (5 pts) '0 (mA) 1O 1kQ ...
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