Exercise 3: Series-Shunt Voltage Gain
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1 Exercise 3: Series-Shunt Voltage Gain When you have completed this exercise, you will be able to calculate and measure series-shunt voltage oscilloscope. Resistor R ef provides series feedback to the input stage. Which resistor provides shunt feedback? a. R sh b. R ef The circuit voltage gain (Av) is directly related to the feedback ratio and can be determined by the following equation. Av = R sh ef What is the circuit voltage gain (Av = R sh ef )? a. 20 b Festo Didactic P0
2 shown. All ac oscilloscope measurements and accompanying calculations are peak-to-peak (pk-pk) values, unless stated otherwise. Use ac coupling and x10 probes for these measurements. circuit. Connect the oscilloscope channel 1 probe to the base of Q1. Connect the oscilloscope channel 2 probe to the output (V o ). pk-pk sine wave at V o. Festo Didactic P0 153
3 Measure the input signal voltage (V i ) on oscilloscope channel 1 (at the base of Q1). V i = mv pk-pk (Recall Value 1) Calculate the voltage gain (Av). V i = mv pk-pk (Step 4, Recall Value 1) V o = 1.0 V pk-pk Av = V o i Av = (Recall Value 2) Calculate the voltage gain based on the feedback resistor values. R8 is the shunt feedback resistor (R sh ), and R6 is the series feedback resistor (R ef ). Av = R sh ef Av = (Recall Value 3) 154 Festo Didactic P0
4 The voltage gain you calculated from the feedback resistor values ( [Step 6, Recall Value 3]) and the voltage gain you calculated from the measured values ( [Step 5, Recall Value 2]) are a. not related. b. nearly the same. and verify that the output is set to 1 V pk-pk. 5.6 k to 1 k. Monitor the output on the oscilloscope while turning CM 10 on and off with the Toggle switch. With CM 10 on, the output a. increases by 10. b. remains nearly constant. Festo Didactic P0 155
5 from 12 k to 7.76 k. Adjust the signal generator for 1 V pk-pk at V o. Measure the input voltage (V i ) on oscilloscope channel 1 (at the base of Q1). V i = mv pk-pk (Recall Value 4) 156 Festo Didactic P0
6 Calculate the voltage gain with CM 8 activated. V i = mv pk-pk (Step 12, Recall Value 4) V o = 1 V pk-pk Av = V o i Av = (Recall Value 5) Calculate the voltage gain based on the feedback resistor values. R8 is the shunt feedback resistor, and R6 is the series feedback resistor. Av = R sh ef Av = (Recall Value 6) The voltage gain you calculated from the measured voltages ( [Step 13, Recall Value 5]) and the voltage gain you calculated from the resistance values ( [Step 14, Recall Value 6]) are a. nearly the same. b. not related. When the feedback resistor ratio changes, the voltage gain a. is not affected. b. changes according to the feedback ratio. Make sure all CMs are cleared (turned off) before proceeding to the next section. Festo Didactic P0 157
7 has series feedback, and the output stage has shunt feedback. The voltage gain equals the ratio of the shunt resistor and the series resistor (Av = R sh ef ). The output collector resistor does not affect the voltage gain. 1. shown. Measure the voltage gain with C2 removed from the circuit. Set V o to 1 V pk-pk, and measure V i (Av = V o i ). The voltage gain a. decreases to 100. b. increases to 50. c. does not change. d. decreases to approximately Removing capacitor C2 affected the gain because the a. series feedback resistance increased. b. shunt feedback resistance increased. c. series feedback decreased. d. shunt feedback decreased. 158 Festo Didactic P0
8 3. to 100. The voltage gain (Av = R sh ef ) a. does not change. b. changes to 12. c. changes to 120. d. None of the above 4. Changing the value of collector resistor R9 from 5.6 k to 1 k a. increases the feedback ratio. b. decreases the feedback ratio. c. has very little effect on the voltage gain. d. has a large effect on the voltage gain. 5. a. R sh ef. b. R ef sh. c. V i o. d. I o i. Make sure all CMs are cleared (turned off) before proceeding to the next section. Festo Didactic P0 159
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