Method and circuit for controlling the refresh rate of...

Details Method and circuit for controlling the refresh rate of... Method and circuit for controlling the refresh rate of...

2011-07-19

2011-07-19

Tso, Edward (Department: 2858)

Electricity: battery or capacitor charging or discharging

Capacitor charging or discharging

Reexamination Certificate

active

07982438

ABSTRACT:
The present invention relates to controlling the refresh rate of the reference voltage on a sampling capacitor (Csamp). A comparator (COMP) compares the voltage on a first capacitor (C1) with the voltage on a second capacitor (C2). These capacitors have the capacitance of the sampling capacitor (Csamp). Upon each refresh the first capacitor (C1) samples a first voltage (Va) and the second capacitor samples a lower second voltage (Vb). The first capacitor (C1) is discharged at a first current Iavia a first leakage current source (D1). The second capacitor (C2) is discharged at a second current Ibvia a second leakage current source (D2). The comparator (COMP) triggers a refresh when the voltages equal. The first current Iais preferably an integer N times the second current Ib.

REFERENCES:
patent: 4768170 (1988-08-01), Hoff
patent: 5392251 (1995-02-01), Manning
patent: 6278242 (2001-08-01), Cok et al.
patent: 2005/0168292 (2005-08-01), Frans et al.
patent: 2005/0248755 (2005-11-01), Chou et al.
patent: 2006/0257804 (2006-11-01), Chian et al.
patent: 0909294 (1999-03-01), None
patent: 0 902 294 (1999-03-01), None

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