using dc inputs. You will verify circuit operation with a multimeter.
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1 Op Amp Fundamentals using dc inputs. You will verify circuit operation with a multimeter. FACET by Lab-Volt 77
2 Op Amp Fundamentals O circuit common. a. inverts the input voltage polarity. b. does not invert the input voltage polarity. Can the feedback resistor be adjusted to produce a circuit gain of 1? a. Yes, if R3 is set for minimum resistance. b. Yes, if R3 is set for about c. No. 78 FACET by Lab-Volt
3 Op Amp Fundamentals at nearly 0 V. In a noninverting op amp, the voltage at the inverting input is always held to 0 V. a. true b. false FACET by Lab-Volt 79
4 Op Amp Fundamentals I When V I 80 FACET by Lab-Volt
5 Op Amp Fundamentals Locate the NON-INVERTING AMPLIFIER circuit block, and connect the circuit shown. Make sure the circuit input is connected to circuit common. O Monitor the circuit output as you remove the circuit input-to-common connection. For this Based on your observation, the op amp is a. saturated. b. not saturated. FACET by Lab-Volt 81
6 Op Amp Fundamentals procedure. I Based on the circuit input and output voltages, what is the circuit gain? Av = Recall Value 1 Based on your voltmeter indications, are the input and output voltage polarities identical? a. yes b. no Use your voltmeter to measure the differential input voltage [V Your reading indicates that a. U1 is saturated. b. U1 is operating normally. c. circuit current is 0. d. the circuit now operates as an inverting 82 FACET by Lab-Volt
7 Op Amp Fundamentals You measured a circuit voltage gain of about Recall Value 1 values given, which formula is correct? a. b. c. d. Measure the voltage at each input terminal of the op amp. Based on your readings, a. b. V should be +2 Vdc. c. a circuit summing junction does not exist. d. I O O I a. yes b. no FACET by Lab-Volt 83
8 Op Amp Fundamentals control from end to end. Based on V, a. U1 is not saturated. b. the op amp compensates for the entire input voltage range. c. U1 is saturated for the total input voltage range. d. U1 is saturated for a partial range of input voltages. I Based on the voltage drops of R1, R2, and R4, a. b. the current through R2 essentially equals the current through R1. c. the voltage across R2 is 9 times greater than the voltage across R1. d. All of the above. Adjust V I to +1.0 Vdc. Be precise. Based on the voltage drops of R1, R2, and R4, a. b. the current through R2 essentially equals the current through R1. c. the voltage across R2 is 9 times greater than the voltage across R1. d. All of the above. 84 FACET by Lab-Volt
9 Op Amp Fundamentals Place CM switch 15 in the ON position to modify the value of R2. Adjust V I to a convenient Based on the input and output voltages of your circuit, the gain a. increased and R2 decreased. b. decreased and R2 decreased. Based on your circuit observations, a change of V I causes a change in V O because a. feedback voltage is required to maintain V at 0 V. b. the input voltage change initially upsets the balanced op amp input differential voltage. c. the op amp uses the change in V O d. All of the above. A noninverting op amp circuit can be adjusted to minimize offset voltage errors. In a noninverting op amp circuit, the input and output voltage polarities are identical. FACET by Lab-Volt 85
10 Op Amp Fundamentals 1. Locate the NON-INVERTING AMPLIFIER circuit block and connect the circuit shown. block to generate an input voltage for your op amp circuit. What is the approximate circuit gain? a b. 1.5 c. 15 d The TRIM adjust potentiometer in this circuit a. minimizes offset errors. b. adjusts circuit gain. c. prevents op amp saturation. d. controls the amount of feedback voltage. 3. a. does not change the circuit input voltage polarity. b. c. Both of the above. d. None of the above. 4. The noninverting terminal of this circuit serves as the a. input reference of the circuit. b. circuit input terminal. c. summing junction. d. All of the above. 5. a. b. c. d. Both inputs of U1 are at virtual ground. 86 FACET by Lab-Volt
An input resistor suppresses noise and stray pickup developed across the high input impedance of the op amp.
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