HW2soln_corrected

HW2soln_corrected - PHYS3360/AEP3630 Electronic Circuits...

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Unformatted text preview: PHYS3360/AEP3630 Electronic Circuits, Spring 2011, HW2 Solutions Operational Amplifier Solutions 1. Recall that ¡¢¢ £ ¤ ¥¦§§ ¨¤ ©ª«« where ¤ ¥¦§§ and ¤ ©ª«« are gains for differential and common mode voltages across the op-amp inputs. Best ¡¢¢ means its max value specified by the manufacturer. Checking the spec sheets gives 90dB (typical) for both 741C and 3140 and 100dB (typical) for LF356. Casting these values in units of V/V is insightful – it tells you what 1V of ¬ ©« is equivalent to with regards to ¬ ¥¦§§ (expressed in V). E.g. 100dB for LF356 means 5 orders of magnitude change in voltage or 10 V/V. 90dB (741C and 3140) means 10 6 /10 90/20 = 32 V/V. 2. The output voltage is given by ¬ ª­® £ ¤ ¥¦§§ ¬ ¥¦§§ ¯ ¤ ©ª«« ¬ ©ª«« ( ¤ ¥¦§§ is same as ¤ ). Converting dB to linear scale we find, ¤ ¥¦§§ £ °± ²³³¨´³ £ °± µ and ¤ ©ª«« £ ¶ ·¸¹¹ º»¼¼ £ ½¾°¿ . Using the values given we find that the op-amp will be in saturation with ....
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This note was uploaded on 06/10/2011 for the course AEP 3630 taught by Professor Bozarov during the Spring '08 term at Cornell.

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HW2soln_corrected - PHYS3360/AEP3630 Electronic Circuits...

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