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Notice that it has two op amps and is hence a dual

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Unformatted text preview: lease draw the high-­‐level diagram with the pins labeled, not the transistor-­‐level circuit. Pre-­‐Lab Score __/3 On some pin diagrams, there are pin outs labeled “NC”. What does “NC” stand for? (The TLC277 does NOT have a NC but ICs that you encounter in the future may. ( Pre-­‐Lab 1 p t ) ( NC – No connection. In the circuit diagram, which pin numbers and labels are the positive and negative power supply connections of the TLC277? ( Pre-­‐Lab 4 p t s ) ( Positive supply label: VDD Negative supply label: GND Pin : Pin: 8 4 NOTE: The operational amplifier is an active component and requires power. If you fail to connect the power connections for circuit components that require power, it will not work. O p e r a t i o n a l A m p l i f i e r B a s i c s The two main characteristics of an ideal op-­‐amp are the following: Infinite gain (ie, a change in even a fraction of a millivolt in the input will swing the output over its full range), and infinite input impedance (absolutely zero current will flow into the inputs). To apply circuit analysis with ideal op-­‐amps, use nodal analysis but with these “golden rules” shown below: (1) no current flows into the op-­‐amp and (2) the input voltages are n identical if the op-­‐amp is in a n e g a t i v e f e e d b a c k c o n f i g u r a t i o n . Please see the lecture notes posted on Piazza for more information on amplifiers. 3 Lab 3: Operational Amplifiers EE43/100 Summer 2013 C. J. Chang-­‐Hasnain Vp = Vn only for negative feedback configurations Here are some helpful Wikipedia articles about op-­‐amps and line. Remember you must consider two cases, when the I input goes from low to high and when the input goes from high to low. I d e n t i f y a n d i n d i c a t e t h e d i r e c t i o n of each curve with an arrow in your graph, especially in the areas where the curves do not have the same value. Score __/5 13 Lab 3: Operational Amplifiers L a b R e p o r t S u b m i s s i o n s EE43/100 Summer 2013 C. J. Chang-­‐Hasnain The pre-­‐lab is due at the beginning of the lab section. Make sure you have completed all questions and drawn all the diagrams for this lab. In addition, attach any loose papers specified by the lab and submit them with this document. (This pre-­‐lab is group work. Submit one pre-­‐lab report per group.) The lab report is due at the beginning of the lab #5. This lab is designed to be completed in groups of two and only one lab report per team is required. Submit the lab report AFTER your GSI has signed off on your working circuit. Make sure the names and student IDs of BOTH team members are on this document (preferably on the front). I m a g e C i t a t i o n s Textbook Images are courtesy of Fawwaz T. Ulaby and Michel M. Maharbiz and National Technology and Science Press. Fawwaz T. Ulaby and Michel M. Maharbiz, Circuits © 2009 National Technology and Science Press 14...
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