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The input impedance of an ideal ammeter should be zero infinity

Disclaimer: This review is based on clicker questions that directly relate to the lectures. The exam will also contain materials from the labs and pre-labs and it will not be multiple-choice .

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The input impedance of an ideal ammeter should be zero infinity

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  1. Disclaimer: This review is based on clicker questions that directly relate to the lectures. The exam will also contain materials from the labs and pre-labs and it will not be multiple-choice. If a topics isn’t covered in today’s class it doesn’t mean that that topics will not be on the exam. (We can’t cover 14 lectures and 7 labs in 50 minutes.)

  2. The input impedance of an ideal ammeter should be zero infinity A well defined non-zero value (e.g. 1 or 1k) D) It should provide a constant current E) should have a shiny red color

  3. The input impedance of an ideal voltmeter should be zero. infinity. a well defined non-zero value (e.g. 1 or 1k). D) It should provide a constant voltage. E) It should have a bright yellow color.

  4. What is the output impedance of an ideal voltage source? • zero • infinity • a well defined resistance, but not zero or infinity (e.g. 1 or 1k) • purely complex (i.e. non-zero reactive) • potato

  5. What is the output impedanceZout of this circuit? R1 + R2 R1 – R2 R1R2/(R1+R2) R1/(R1+R2) R2/(R1+R2) R1 A V R2 B

  6. What is the output impedanceZout of this circuit? 1/(1/R1+1/R2+1/R3) R1+ R2 + R3 R1R2/(R1+R2) R1/(R1+R2) R2/(R1+R2) R1 R3 A V R2 B

  7. The input impedance of many scopes is 1 MW. What voltage does a scope with 1 MW impedance measure across the lower 1 MW resistor? • 0 V • 2.5 V • 3.3 V • 5 V • 7.5 V 1MW 10V 1 MW

  8. What is the cut-off frequency fc (aka. the 3dB-frequency f3dB) of this circuit? 159 Hz 1 kHz 6.3 kHz 1 MHz None of the above 1k Vout Vin 1μF

  9. What is the gain G of this circuit at the cut-off frequency fc? 0 0.5 0.7 1 None of the above 1k Vout Vin 1μF

  10. Draw a bode-plot of this circuit from 1Hz to 1MHz. Draw the vertical axis as “power gain“ (|G|2 in units of dB) and make sure to label the axes correctly (including tick marks). 1k Vout Vin 1μF

  11. For the circuit below, it is observed that Vin >> Vout. The shape of Vin is shown at right. Which of the choices best represents Vout? (Note: Vertical axes are not to scale.)

  12. Voutis: • –3 V • –6 V • –9 V • –15 V • None of the above Vin = 3 V

  13. What is the voltage at the inverting input? A) Rf B) R V1 Vout R V2 C) Rf D) E) None of the above

  14. The open loop gain of this op-amp is 105 and the open loop bandwidth is 10 Hz. What is the bandwidth of a voltage follower made with this op-amp? • 10 kHz • 100 kHz • 1 MHz • 10 MHz • Can not be determined Vout Vin

  15. What is the (approximate) 3dB bandwidth of the circuit shown below if the transition frequency of this transistor is fT= 200 MHz. (Assume that Vin is appropriately biased, i.e. VBE ≥ 0.6V.) +20V 2k 10 kHz 100 kHz 1 MHz 10 MHz Can not be determined Vout Vin 100 0V

  16. For Vin as shown, rank outputs 1, 2, and 3 according to peak-to-peak amplitude from largest to smallest • 1 > 2 > 3 • 1 > 2 = 3 • 2 = 3 > 1 • 2 > 3 > 1 • 3 > 2 = 1

  17. If you have a signal with ~1V amplitude but you know that your signal cannot deliver more than 1 nAof current, what device would you use to amplify it? A bipolar transistor amplifier A J-FET amplifier A MOSFET amplifier A diode amplifier An inverting op-amp amplifier.

  18. What is Vout with the gate grounded (i.e. Vin= 0V)? +10 V ID 1k Vout VGS = 0V Vin 4mA 0 V VGS = -0.2V 3mA 0 V 4 V 5 V 6 V 10 V VGS = -0.6V 2mA VGS = -1.5V 1mA VDS 5V

  19. What is the maximum gain of this amplifier? +10 V ID 1k Vout VGS = 0V Vin 4mA 0 V VGS = -0.2V 3mA 1 2 5 10 20 VGS = -0.6V 2mA VGS = -1.5V 1mA VDS 5V

  20. circuit 1 circuit 2 • For a triangular input voltage (from -10V...+10V), the output of circuit 2 is: • identical to that of circuit 1 • different; Vout2,pk-pk > Vout1,pk-pk • different; Vout2,pk-pk < Vout1,pk-pk • different; Vout2,pk-pk = Vout1,pk-pk

  21. Vin =  –1 V. No load is attached to the circuit. • Vout is: • -2 V • +2V • -5 V • +5 V • None of the above

  22. A bipolar junction transistor (BJT) is • a current controlled current amplifier. • a voltage controlled current amplifier. • a current controlled voltage amplifier. • a voltage controlled voltage amplifier. • none of the above.

  23. L Vout Vin You want to make a bode-plot of a piece of wire of length L. At 1 MHz you find that the phase between Vout and Vin is about 90°. So how long does it take for an electric signal to travel from one end of the wire to the other? No time at all. ~ 100 ns ~ 250 ns ~ 500 ns ~ 1 μs

  24. N4 A ● 0 = 0 1 A A

  25. N5 A ● 1 = 0 1 A A

  26. N6 A ● A = 0 1 A A

  27. N7 A ● A = 0 1 A A

  28. N8 A ● (A+B) = 0 1 A B A ● B

  29. For the specified Vin, the following three output signals Vout were observed. • The graphs above, from left to right, could have been collected using circuits: • 3,4,1 • 3,4,2 • 1,4,3 • 3,2,1 • none of the above

  30. z1 and z2 are two complex numbers with: , and • ( • ( • none of the above

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