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 A)zero B)infinity C)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 A)zero. B)infinity. C)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? A)zero B)infinity C)a well defined resistance, but not zero or infinity (e.g. 1  or 1k  ) D)purely complex (i.e. non-zero reactive) E)potato

5. What is the output impedance Z out of this circuit? A)R 1 + R 2 B)R 1 – R 2 C)R 1 R 2 /(R 1 +R 2 ) D)R 1 /(R 1 +R 2 ) E)R 2 /(R 1 +R 2 ) V R1R1 R2R2 A B

6. What is the output impedance Z out of this circuit? A)1/(1/R 1 +1/R 2 +1/R 3 ) B)R 1 + R 2 + R 3 C)R 1 R 2 /(R 1 +R 2 ) D)R 1 /(R 1 +R 2 ) E)R 2 /(R 1 +R 2 ) V R1R1 R2R2 A B R3R3

7. A)0 V B)2.5 V C)3.3 V D)5 V E)7.5 V 10V 1M  The input impedance of many scopes is 1 M . What voltage does a scope with 1 M  impedance measure across the lower 1 M  resistor?

8. V in V out 1k  1μF1μF What is the cut-off frequency f c (aka. the 3dB-frequency f 3dB ) of this circuit? A) 159 Hz B) 1 kHz C) 6.3 kHz D) 1 MHz E) None of the above

9. V in V out 1k  1μF1μF What is the gain G of this circuit at the cut-off frequency f c ? A) 0 B) 0.5 C) 0.7 D) 1 E) None of the above

10. V in V out 1k  1μF1μF 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).

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

12. V out is: A) –3 V B) –6 V C) –9 V D) –15 V E) None of the above V in = 3 V

13. What is the voltage at the inverting input? A) B) C) D) R RfRf V1V1 V out R RfRf V2V2 E) None of the above

14. V in V out The open loop gain of this op-amp is 10 5 and the open loop bandwidth is 10 Hz. What is the bandwidth of a voltage follower made with this op-amp? A)10 kHz B)100 kHz C)1 MHz D)10 MHz E)Can not be determined

15. What is the (approximate) 3dB bandwidth of the circuit shown below if the transition frequency of this transistor is f T = 200 MHz. (Assume that V in is appropriately biased, i.e. V BE ≥ 0.6V.) A)10 kHz B)100 kHz C)1 MHz D)10 MHz E)Can not be determined +20 V 0 V0 V V out V in 2 k2 k 100 

16. 16 For V in as shown, rank outputs 1, 2, and 3 according to peak-to- peak amplitude from largest to smallest A)1 > 2 > 3 B)1 > 2 = 3 C)2 = 3 > 1 D)2 > 3 > 1 E)3 > 2 = 1

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

18. A) 0 V B) 4 V C) 5 V D) 6 V E) 10 V What is V out with the gate grounded (i.e. V in = 0V)? IDID V DS V GS = 0V V GS = -0.2V V GS = -0.6V V GS = -1.5V 4mA 3mA 2mA 1mA 5V +10 V 1k  V out V in 0 V

19. A) 1 B) 2 C) 5 D) 10 E) 20 What is the maximum gain of this amplifier? IDID V DS V GS = 0V V GS = -0.2V V GS = -0.6V V GS = -1.5V 4mA 3mA 2mA 1mA 5V +10 V 1k  V out V in 0 V

20. 20 For a triangular input voltage (from -10V...+10V), the output of circuit 2 is: A)identical to that of circuit 1 B)different; V out2,pk-pk > V out1,pk-pk C)different; V out2,pk-pk < V out1,pk-pk D)different; V out2,pk-pk = V out1,pk-pk circuit 2circuit 1

21. V in = –1 V. No load is attached to the circuit. V out is: A) -2 V B) +2 V C) -5 V D) +5 V E) None of the above

22. A bipolar junction transistor (BJT) is A) a current controlled current amplifier. B) a voltage controlled current amplifier. C) a current controlled voltage amplifier. D) a voltage controlled voltage amplifier. E) none of the above.

23. V in V out You want to make a bode-plot of a piece of wire of length L. At 1 MHz you find that the phase between V out and V in is about 90°. So how long does it take for an electric signal to travel from one end of the wire to the other? A)No time at all. B)~ 100 ns C)~ 250 ns D)~ 500 ns E)~ 1 μ s L

24. N4 A ● 0 = A) 0 B) 1 C) A D) A

25. N5 A ● 1 = A) 0 B) 1 C) A D) A

26. N6 A ● A = A) 0 B) 1 C) A D) A

27. N7 A ● A = A) 0 B) 1 C) A D) A

28. N8 A ● (A+B) = A) 0 B) 1 C) A D) B E) A ● B

29. 29 For the specified V in, the following three output signals V out were observed. The graphs above, from left to right, could have been collected using circuits: A)3,4,1 B)3,4,2 C)1,4,3 D)3,2,1 E)none of the above

30. z 1 and z 2 are two complex numbers with:, and