Optimization of Active Substrate Noise Cancelling Technique using Power Line di/dt Detector

Abstract

This paper demonstrates optimization of a feedforward active substrate noise canceling technique using a power supply di/dt detector. Our past study realized substrate noise canceling using a di/dt detector. For further substrate noise reduction, this study analyzes the parameters which constitute a di/dt canceller and develops the effective di/dt noise canceling scheme. As a result, we realized 62% substrate noise reduction. Compared with effect of guard ring, our multiple di/dt canceller suppressed about five times as much substrate noise as that of guard ring.