Cosmin Iorga, founder and president of NoiseCoupling.com, holds a PhD in electrical engineering from Stanford University, Calif. He is the author of the book Noise Coupling in Integrated Circuits: A Practical Approach to Analysis, Modeling, and Suppression. Email address: cosmin.iorga@noisecoupling.com Web site: http://www.noisecoupling.com
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October 1, 2009[Ideas For Design] Use Hybrid PMOS-NMOS Active Loads To Cut Substrate Noise In Differential Amplifiers
BY MAKING A RELATIVELY simple change in a differential amplifier stage, designers can significantly reduce the sensitivity to digital switching noise. In mixed-signal ICs, digital switching noise couples through the common substrate into analog circuits, degrading their performance. In CMOS circuits, most substrate noise couples into NMOS transistors through backgate modulation. That is, the substrate acts as a second gate with a transconductance gain...
