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What is Substrate Noise in CMOS Analog ICs about?
This document discusses strategies for reducing substrate noise in mixed-signal CMOS ICs. The substrate acts as a low-ohmic connection for digital switching noise. This can interfere with analog circuits. The document recommends connecting analog ground to the substrate while referring analog signals to an external clean ground. It provides examples of how to apply this strategy to current mirrors, bandgaps, and op-amps. Experimental results show this approach reduces substrate noise interference.
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- EN