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.)

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

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.

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

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

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

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?

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

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

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).

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.)

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

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

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

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 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

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.

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

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 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

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

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.

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

N4 A ● 0 = A) 0 B) 1 C) A D) A

N5 A ● 1 = A) 0 B) 1 C) A D) A

N6 A ● A = A) 0 B) 1 C) A D) A

N7 A ● A = A) 0 B) 1 C) A D) A

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

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

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