Differental current source for generating DRAM refresh signal

Details Differental current source for generating DRAM refresh signal Differental current source for generating DRAM refresh signal

2007-02-20

2007-02-20

Le, Thong Q. (Department: 2827)

Static information storage and retrieval

Read/write circuit

Data refresh

C365S211000

Reexamination Certificate

active

10386147

ABSTRACT:
A circuit for generating a refresh signal for a memory cell of a semiconductor memory includes a capacitor and a differential current source for providing a charging current to the capacitor. The differential current source includes a temperature-dependent and a temperature-independent current source connected such that the charging current is proportional to a difference between a temperature-dependent current and a temperature-independent current. A comparator a voltage at a capacitor terminal and a reference voltage. The comparator generates a refresh signal when capacitor voltage exceeds the reference voltage.

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