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# L2 - L2 Op-amps Labs 2 and 3 concern operational amplifiers...

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Unformatted text preview: L2 Op-amps Labs 2 and 3 concern operational amplifiers, or “op-amps.” Op-amps were originally developed to implement mathematical operations in analog computers, hence their name. Today, op-amps are commonly used to build amplifiers, active filters, and bu ff ers. You will work with many of these circuits in lab. In class we discussed op-amps as ideal elements. However, there are di ff erences between the ideal and practical characteristics. Op-Amp Property Ideal in practice Gain A ∞ very large, ∼ 10 6 and constrained by supply voltage R i ∞ very large, ∼ 10 6 Ω R o very small, ∼ 15 Ω Frequency response flat gain depends on frequency The objective of this experiment is to gain experience in the design and construction of oper- ational amplifier circuits. You will also examine some non-ideal op-amp behavior. By the end of Lab 2, you will have designed and built two amplifiers for your radio circuit. Once you have verified that they work, you will connect them to your envelope detector from Lab 1 and listen to synthetic AM signals. 1 Prelab In the prelab exercises, you will review the analysis of op-amp circuits and design amplifiers for your radio circuit. 1. Assuming ideal op-amps, derive an expression for the output voltage v o in each of the two circuits in Figure L2.1. Simplify your expression as much as possible. 327 L2 Op-amps (a) R 4 +- R 1 R 2 R 3 v o v 1 v 2 (b) R 4 +- R 1 R 2 R 3 v o v 1 R 5 Figure L2.1: Circuits for prelab analysis. R 1 R 2 v o v i +- Figure L2.2: Circuit for analysis and design problem. 2. Again assuming an ideal op-amp, derive an expression for the output voltage v o in the circuit in Figure L2.2. a) For a gain v o v i of 2, how must R 1 and R 2 be related? b) For a gain v o v i of 11, how must R 1 and R 2 be related? c) How do you build two amplifiers, one with a gain of two and one with a gain of 11, given four resistors: one 2 k Ω , two 10 k Ω , and one 20 k Ω ? d) Using the pin-out diagram in Figure L2.3 as a reference, draw how you will wire the 328 L2 Op-amps V CC + +- V CC- 1 2 3 4 8 7 6 5 Pins 1,5 o ff set null correction — not used 2 inverting input (-) 3 non-inverting input (+) 4 V CC- supply set to -12 V (DC) 7 V CC + supply set to 12 V (DC) 6 output voltage v o 8 not connected Figure L2.3: Pin-out diagram for the 741 op-amp....
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L2 - L2 Op-amps Labs 2 and 3 concern operational amplifiers...

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