| 摘要 |
A methodology of creating integrated circuits with improved noise isolation is presented. The circuitry of an integrated circuits is separated into noise generating circuit blocks and noise sensitive circuit blocks. N-type and P-type diffusion guard rings are placed around each of the circuit blocks. Substantially overlying the N-type and P-type diffusion guard rings are power supply meshes which are intimately in contract with the guard rings below through spaced apart vias. The power supply meshes not only supply power for the circuit blocks, but also reverse-bias the diffusion guard rings for improved noise isolation.
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