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Variable Gain with Digital Pot, noise performance?

Question asked by riscy0000 on Feb 12, 2013
Latest reply on Feb 26, 2013 by musach



I wish to read an article related to the noise impacts when applying digital pot into an instrument amp (RG), where RG is varied that set the gains.


Has anyone discussed noise model or provide proof that noise performance is not (or is) a major issue as part of low noise AFE circuit. You may assumed the 1st stage has fixed gain of 10V/V follow by variable gains of 1V/V to 100V/V. The Digital pot is SPI based (one concern is SPI data/clock noise) but that can be isolated via logic gate or RC filter.