EE 230 HW 6 Spring 2010

EE 230 HW 6 Spring 2010 - EE 230 Homework Assignment 6...

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EE 230 Homework Assignment 6 Spring 2010 Problem 1 Consider the basic noninverting feedback amplifier circuit where the nominal dc gain is given by the expression 2 0 1 R K=1+ R . a) Assuming the gain of the op amp is given by () 0A 1 A A •BW As= s+BW Show that the magnitude of the open-loop gain and the closed-loop gain are as depicted in the figure shown. That is, they both are first-order lowpass, have dc gains of A 0 and K 0 respectively, and that as frequencies enter the stopband, that they are nearly coincident. b) Show that there is very little difference in the closed loop response if the simpler open loop gain expression GB s where GB=A 0 BW A Page 1 of 5
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Problem 2 Determine the 3dB bandwidth of the following circuits if the op amp is the National LMP 2231 biased with a single 5V dc power supply. R 3 =20K V IN V OUT R F =20K R 1 =20K R 2 =40K . Problem 3 Determine the 3dB bandwidth of the cascade of 4 identical noninverting amplifiers and compare with that of a single noninverting amplifier if both structures are to achieve the same gain.
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EE 230 HW 6 Spring 2010 - EE 230 Homework Assignment 6...

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