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Unformatted text preview: 36 Experiment 13. Principles and Characteristics of Operational Amplifiers (OP Amps) 0. Preliminary Study A. Investigate characteristics of ideal OP Amps and their different types. B. Investigate inverting, non-inverting, and summing amplifiers. 1. Objective of Experiment A. To understand the characteristics and operational principles of the OP Amps. B. To understand the amplification scheme of analog signals by constructing inverting, non-inverting, and summing amplifiers based on OP Amps. 2. Tasks A. To experiment basic operations of OP Amps. B. To construct and test inverting, non-inverting, and summing amplifiers. 3. Equipment and Supplies A. Oscilloscope B. Function Generator C. Digital voltmeter D. Power Supply E. OP Amp (741) F. Resistors (R=3 kΩ, 10 kΩ, and 20 kΩ) and condenser (0.1 μF) 4. Theory Refer to the following references A. Korean Lab Book (기계공학도를 위한 전기전자공학실험) B. Chapter 8, Giorgio Rizzoni, Principles and Applications of Electrical Engineering 5 th Ed 5. Experimental Procedure (This part is a little different from the original Korean experiment textbook.) 5.1. Inverting Amplifier Construct an amplification circuit as shown in Figure 2 and observe the inverting amplification of the input signals from the function generator by the oscilloscope. Here, “inverting” means the reversal of the phase by 180°. A. Choose a square wave as the input signal from the function generator. Connect one terminal of the BNC cable to the output socket of the function generator. Connect another terminal of the cable to the circuit such that positive (red) wire is connected to Vi and ground (black) wire is connected to the ground. 37 B. Connect Vo to the oscilloscope input while GND wire of the probe is connected to the ground of the circuit. C. Connect -12V and +12V from the power supply to the nodes 4 and 7 of the OP Amp, respectively. D. Turn on the power supply and function generator, adjust the vertical offset of the oscilloscope display (zero signal is located at the center of the display vertically). Observe the output signals (magnitude and phase) for square and sine wave inputs. Verify that the phase of the input signal is inverted in the amplified output signal. E. Replace resistor R 2 with a variable resistor. Measure the amplification factor for different resistance values of R 2 and compare with the theoretical calculation. F. Measure the OP amp (+)(-) input voltage by the digital volt meter. 5.2. Non-inverting Amplifier Construct the amplification circuit as shown in Figure 3 and observe the non-inverting amplification of the input signal of the function generator by the oscilloscope. Here, “non-inverting” means that the phase of the input signal is maintained in the amplified output signal....
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This note was uploaded on 11/21/2010 for the course MECHANICAL mae302 taught by Professor Jang during the Spring '10 term at Seoul National.
- Spring '10