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### ECE 351 Exam 1 Spring 2003

Course: ECE 351, Fall 2009
School: Rose-Hulman
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Word Count: 286

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351 ECE Exam 1 Spring 2003 Name____________________ Section_______ CM____ Scores: 1) 2) 3) 4) Total____________ I pledge on my honor that I did not copy any of this exam, and that this work is entirely my own. Furthermore, I did not use PSpice during this exam. ____________________________________ Page 1 of 10 Problem 1 (25 Points): The circuit below is a current source: R a I Q 3 Q 1 Q 2 R b -V e e Find...

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351 ECE Exam 1 Spring 2003 Name____________________ Section_______ CM____ Scores: 1) 2) 3) 4) Total____________ I pledge on my honor that I did not copy any of this exam, and that this work is entirely my own. Furthermore, I did not use PSpice during this exam. ____________________________________ Page 1 of 10 Problem 1 (25 Points): The circuit below is a current source: R a I Q 3 Q 1 Q 2 R b -V e e Find a set of two equations that can be used to design the source for a specific current, I. Page 2 of 10 Page 3 of 10 Problem 2 ( 25 Points): Vcc R 4 Q 6 Q 7 R y Vout Q 4 + V in - C 1 R x Q 2 Q 1 R 2 -V e e a) Draw the small signal model.(10 points) b) Find the midband gain, Vout/Vin. (15 points) Page 4 of 10 Page 5 of 10 Problem 3a (15 Points): Find the small-signal differential-mode input resistance for the below. amplifier (In other words, find the input resistance seen by vdm.) (15 points) V cc V cc Rc1 Rc2 Vo1 Vo2 + Vs1 - + - Vs2 I REE -V e e Page 6 of 10 Page 7 of 10 Problem 3b (10 Points): The circuit shown below is a differential amplifier that uses a Darlington-connected differential pair to increase the differential input impedance: Vcc Vcc + R C 1 Vo1 + R C 2 Vo2 + + Vs2 Vs1 - 0 + R EE -V e e 0 By what factor is the differential input impedance increased in this circuit over...

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Rose-Hulman - ECE - 351
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Rose-Hulman - ECE - 351
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vti_encoding:SR|utf8-nl vti_timelastmodified:TR|28 May 2003 02:39:54 -0000 vti_extenderversion:SR|5.0.2.4330 vti_author:SR|HERNITER-1\herniter vti_modifiedby:SR|HERNITER-1\herniter vti_timecreated:TR|28 May 2003 02:39:54 -0000 vti_cacheddtm:TX|28 May
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