Transcription of Differential and Common Mode Gain lecture - ITTC
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Differential and Common Mode Gain lecture - ITTC
2/18/2011 Differential and Common Mode Gain lecture 1/8 Jim Stiles The Univ. of Kansas Dept. of EECS Differential and Common -Mode Gain Recall that in a previous handout, we analyzed this circuit: R2 R1 + - vout ideal v1 v2 R3 R4 2/18/2011 Differential and Common Mode Gain lecture 2/8 Jim Stiles The Univ. of Kansas Dept. of EECS Common mode and Differential mode We found that the output is related to the inputs as: 4222113411outRRRvvvRRRR =+ + This circuit is a weighted difference amplifier, and typically, it is expressed in terms of its Differential gain Ad and Common -mode gain Acm. To understand what these gains mean, we must first define the difference signal ()dvt and Common -mode signal ()cmvt of two inputs 1()vt and 2()vt.
2/18/2011 Differential and Common Mode Gain lecture 3/8 Jim Stiles The Univ. of Kansas Dept. of EECS Definitions The difference, as we might expect, is defined as: v d () ()tvt vt 21− whereas the common-mode signal is simply the average of the two inputs: () 21 cm 2
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