Internal constant voltage control circuit for memory device

Details Internal constant voltage control circuit for memory device Internal constant voltage control circuit for memory device

1997-08-21

1999-03-09

Nelms, David

Static information storage and retrieval

Powering

Data preservation

365226, G11C 700

Patent

active

058810153

ABSTRACT:
An internal constant voltage control circuit for a semiconductor memory device includes a current source for generating voltage in accordance with current when power is turned on, a bias circuit for outputting a first bias voltage when power is turned on, a first level shifter for receiving the output voltage of the current source and outputting a first voltage, a second level shifter for receiving the output voltage of the bias circuit and outputting a second voltage, and a buffer for differentially amplifying the output voltage of the first level shifter and the output voltage of the second level shifter, and generating an internal voltage. The circuit decreases operation current by reducing an internal voltage during a low temperature operation and securing a timing margin between signals, thereby stabilizing a low temperature operation.

REFERENCES:
patent: 4903237 (1990-02-01), Rao
patent: 5740109 (1998-04-01), Morton et al.

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