Decoupling scheme for mixed voltage integrated circuits

Details Decoupling scheme for mixed voltage integrated circuits Decoupling scheme for mixed voltage integrated circuits

1997-08-05

2000-01-04

Wells, Kenneth B.

Miscellaneous active electrical nonlinear devices, circuits, and

Signal converting, shaping, or generating

Amplitude control

327551, H03K 508

Patent

active

060114193

ABSTRACT:
A decoupling circuit for a mixed voltage integrated circuit chip reduces noise on a high voltage power supply while reducing noise coupling to a low voltage power supply and allowing a thin oxide capacitor dielectric (preferably formed by a process common to the gate insulators of field effect transistors on the chip) to be used for good area-efficiency of the filter capacitors. A series connection of capacitors to ground is used in combination with a resistive charging connection connected to a low voltage power supply to prevent a voltage exceeding a breakdown voltage of the thin oxide being applied to the capacitors. The resistive charging connection in combination with a capacitive voltage divider action of the series connected capacitances provides improved noise attenuation coupled to the low voltage supply.

REFERENCES:
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patent: 5023472 (1991-06-01), Hashimoto et al.
patent: 5307025 (1994-04-01), Colvin et al.
patent: 5329174 (1994-07-01), Chiang
patent: 5341338 (1994-08-01), Hashiguchi et al.
patent: 5479132 (1995-12-01), Verhaeghe et al.

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