Is a
Patent attributes
Patent Jurisdiction
Patent Number
Date of Patent
February 20, 2007
0Patent Application Number
103861470
Date Filed
March 11, 2003
0Patent Primary Examiner
Patent 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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