US 12,462,861 B2
Devices, methods, and systems for calibrating a sensing capacitor used in a sensing circuit for reading memory cells
Alessandro Palludo, Milan (IT); and Stefano Sivero, Comun Nuovo (IT)
Assigned to Ferroelectric Memory GmbH, Dresden (DE)
Filed by Ferroelectric Memory GmbH, Dresden (DE)
Filed on Mar. 13, 2023, as Appl. No. 18/182,562.
Prior Publication US 2024/0312507 A1, Sep. 19, 2024
Int. Cl. G11C 11/22 (2006.01)
CPC G11C 11/2273 (2013.01) [G11C 11/221 (2013.01); G11C 11/2275 (2013.01)] 17 Claims
OG exemplary drawing
 
1. A calibration circuit for calibrating a sensing capacitance used by a sensing circuit when reading memory cells of a memory, the calibration circuit comprising:
a calibration cell associated with a predefined programming state of the calibration cell; wherein the calibration cell comprises a plurality of calibration cells and at least two calibration cells of the plurality of calibration cells are associated with the predefined programming state;
a read circuit configured to:
perform a parallel read operation on the at least two calibration cells of the plurality of calibration cells that generates a calibration voltage based on the predefined programming state;
convert the calibration voltage from the parallel read operation to a target sensing capacitance value based on the calibration voltage;
provide the target sensing capacitance value to the memory as the sensing capacitance for the sensing circuit when reading the memory cells of the memory.