lab1 - ECE-342 Fall 2011, Lab 1 Differential and...

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Unformatted text preview: ECE-342 Fall 2011, Lab 1 Differential and Instrumentation Amplifiers (Due as indicated on Time Management Form) Overview The circuit shown on the right illustrates a simple single op amp dif- ference amplifier. The goal is to provide an output signal which is proportional to the difference between the two input voltages (and in- sensitive to the actual magnitude of the two input voltages). In this lab, youll design, analyze, and test this circuit using a commercial op amp, and youll create a high input-impedance version using an in- strumentation amplifier structure. Section 2.4.2 of the text discusses differential and instrumentation amplifiers. Use an LF-351 or equivalent op amp for your designs, with 12 Vpower supplies. Try to minimize the common-mode gain. Tasks 1. Complete the design of the above difference amplifier to meet the following specifications: Let k denote your lab group number. Your design goal is Differential Gain = (20 + k ) dB Input Resistance = 10- k 2 k The input resistance specification is the resistance seen at each input terminal when all other inputs are grounded. Your design procedures should be clearly described both in your lab notebooks, and in your final report. 2. Read Section 2.4 of the text. Redesign the amplifier of part 1 using the instrumentation amplifier architecture. Your instrumentation amplifier should include a differential amplifier configured to have a differential gain of one. Your design should have very high input impedance, high common-mode rejection ratio, and differential gain as stated in part 1. Include your design procedures and circuit analysis in you notebooks, and in your final report. 3. Simulate your designs. Use an AC analysis to plot the gain versus frequency characteristics for both the differential and the common-mode gains (for both of the above designs)....
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This note was uploaded on 09/20/2011 for the course ECE 342 taught by Professor Hummels during the Spring '07 term at University of Maine Orono .

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lab1 - ECE-342 Fall 2011, Lab 1 Differential and...

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