Internal power supply circuit

Details Internal power supply circuit Internal power supply circuit

2007-04-17

2007-04-17

Jackson, Stephen W. (Department: 2836)

Electrical transmission or interconnection systems

Plural supply circuits or sources

Selective or optional sources

C365S226000

Reexamination Certificate

active

10782826

ABSTRACT:
An internal power supply circuit for a semiconductor integrated circuit includes two constant voltage generators having identical circuit topologies but generating two different constant voltages from an external power supply voltage. The lower constant voltage is selected when the external power supply voltage is below a predetermined level, the higher constant voltage is selected when the external power supply voltage is above the predetermined level, and an internal power supply voltage is generated from the selected constant voltage. The internal power supply voltage is stable over a wide flat region, but can also be raised to a higher level for stress testing of the semiconductor integrated circuit, and the higher level is also stable.

REFERENCES:
patent: 5305270 (1994-04-01), Kim
patent: 5886569 (1999-03-01), Mitsuishi
patent: 6058059 (2000-05-01), Huang et al.
patent: 6870766 (2005-03-01), Cho et al.
patent: 05-314769 (1993-11-01), None
patent: 07-103875 (1995-02-01), None

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