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Unformatted text preview: ECEN 2250 17/03/2008 Circuits/Electronics 1 Spring 2008 Lab Worksheet: Lab 8 NAME :"''( _ Lab Section.". 1\ Q1. Describe how the Schmitt trigger works. The explanation should include the final expressions that were found n the prelab and also the logic steps to obtain them. A final conclusive statement should also be included. Attach graphs obtained in (a) and (b) and the circuit obtained for (b) EXPLAIN , f ":::.: \./ /" , c + I , \ \ ( (' \ ( ( . , ' > __ ~_.J. __ , / ( t \ ,( . '1 J (' Agilent " : ' ECEN 2250 28/02/2008 Circuits/Electronics 1 Spring 2008 Lab Worksheet: Lab 6 ~OL'~ TiTS ',',.c;r'"sheet is casec or all eau.e \/erSIOIl authored hy P Mathys and rnodil.ed by Lucas Porte.. aile G31Tet Moddel NAME: v / / \ . / Lab Section: C) I, ', 01. For each of the resistor combinations in parts (a). (b), and (c) of E1 list the following: (i) Input resistance Rin seen by vs at vs = 1 V. (ii) range of vs and vo for which the inputouput relationship is linear, (iii) sensitivity/immunity to noise. In general only the ratio R2/R1 is given for an inverting amplifier circuit. Based on your measurements in E1 , can you give some guidelines for the range ofval~es from which R1 and R2 should be chosen? Justify your answer: ! l'",.A \. ' I (.\.\..~.<{\, ( \ ) , \ ' ,', \ \ _ ' , " I " , ' . \ _ , ~ " . _ , / . : ~ , : . " , _ \ _ ~ ~ \ \ ; \ ) \ i CI: L \ , ' " 1 (. i" i \ 1 62 . Drawand rab~1 a;;schematic of your noninverting am(~lifier with selectable gains in E2. Explain how you selected and computed the resistor values for R1, R2, and R3. What gains did you measure in PSpice for the different switch settings? What was the input resistance Rin for each of the different gains? ( \ C ' ( , ( .I:=:I "\ _ f' _ '~ , ( i J " ( ' , \ . . r , " 'I (_ C. 1 ; ~ l g", 03. Wnat color LED did you use for the temperature sensor? Starting from room temperature, by how much do you think you can warm up the LED between your fingers? What values did you measure for vo in E1 at (i) room temperature and (ii) when you warmed up the LED between your fingers? What temperature change does this correspond to and how does it compare to your initial guess? . : ,],' \ / r I ' 'j ,I, t c '. ... ( 04_ What values did you use for R2, R3, and R4 in E4? Show your calculations. What voltages did you measure at vo in E2 when the temperature sensing LED was at room temperature and when you warmed it up between your fingers? What temperature difference does that correspond to? (Y\ l '; 1... \ :' j _ . ) " , , t : ' . i \ 05. Provide a table with 10 different resistance values between 500 ohms and 10k ohms versus the current generated. What is the linear range? Sketch, label and briefly explain your constant current circuit design....
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 Fall '08
 MCLEOD

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