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fall04_quiz1_soln

# fall04_quiz1_soln - Name ~ ~" ECSE 2050 Analog...

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Unformatted text preview: Name ~ ~'" . ECSE 2050 Analog Electronics Fall 2004 Quiz I Print you name on every page, show all work to ensure partial credit. Problem 1 (25 points) Problem 2 (10 points) Problem 3 (15 points) Problem 4 (30 points) Problem 5 (20 points) Extra credit (5 points) Total Problem 1 (25pts) R1 ~ R3 Vin o vvv 3k 3k Name: R2 7k-1 6 Vout ~cJ / ~, For the op-amp shown, ignore leads 1 and 5 they are there for offset compensation. Ignore leads 4 and 7, they are the power supply leads. a) Assume the op-amp shown is ideal. Determine the gain, G = VoutNin. \ II '" I+? IJ U1- ~ 1 if"~" ;~Lf- ~/~ ~ ~---- 5 ~~ f ~ t..( (/ fA b) Find the gain again if the op-amp is ideal except that the internal gain isn't infinity, rather it is 200. )... 1/ ~ J- 1/ ' rv() ". ~ 20v (If. +-lIl) 1)/- :: ~ 0/'.)--'- f'-- ? ,'"'- k ~&t + ,-. 1 .....- ~",) ( 11/; I.,- tv"..) ) It)J vt ~ 1.('" t/dJ ~. ~ en Iv v---- ,.. Z,- Udflo.+ .",-- V ,e",",-- 2 0..... ~~ 8\(/ Iv Problem 1 (Continued) Name: C;tJ/~ c) Assume the op-amp is ideal except for an input offset voltage and bias currents. Determine the output voltage error just due to the offsetvoltage if V 05= 10mV. Determine the output error just due to the bias current if Ibia5=20~A.What is the worst case output error due to the combined effects of the offset voltage and the bias current? ~ (Vi j ) ~ t#,J. ~ q /(0 s-- t/,; ( I/el) :' :t gr;... 1/ ~- ~ ~I ~----- ... ~~--::- / J. ( ) 7 1'"--- ~- If"" ,...J,.,. r-- ( J: ) ...-- -- - e..,) ..J II.- . .., thr1~ Ih 7"- --'-.--.0V()..,.r7j ~-~ =t; J" (.1',~ ):: 9 , VJ ~ ~, )(-~: .. )- ~~f.r;1~.~-:1,))(t~J ~f"j ~- Z-::~~) .....- ~ I- 1// W~-<;;f r;u J I..{c)- 't '10-l'6C t::I-I gc],.,..V d) The op-amp has dominate pole internal cdmpensation, i.e. it has a single-time-constant low-pass response. For the circuit shown in this problem, it is experimentally found that the 3dB frequency is 1.2MHz. What would the 3dB frequency be if the 7kO resistor was replaced with a 3kO resistor? What is the unity gain bandwidth, ft, for this op-amp?...
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fall04_quiz1_soln - Name ~ ~" ECSE 2050 Analog...

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