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Substrate noise reduction using active guard band filters in mixed-signal integrated circuits

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4 Author(s)
K. Makie-Fukuda ; Central Res. Lab., Hitachi Ltd., Tokyo, Japan ; S. Maeda ; T. Tsukada ; T. Matsuura

A substrate noise reduction technique using an "active guard band filter", is developed for analog and digital mixed-signal integrated circuits. A noise cancellation signal generated by operational amplifiers is actively input into a guard band to cancel substrate noise. In a 0.8 /spl mu/m CMOS test chip, substrate noise was experimentally suppressed to less than 1% of the original non-canceled noise for frequencies below 1 MHz by using this technique.

Published in:

VLSI Circuits, 1995. Digest of Technical Papers., 1995 Symposium on

Date of Conference:

8-10 June 1995