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Capacitor based resistive processing unit with symmetric weight update

專利號
US11176451B2
公開日期
2021-11-16
申請人
INTERNATIONAL BUSINESS MACHINES CORPORATION（US NY Armonk）
發(fā)明人
Yulong Li; Paul M. Solomon; Effendi Leobandung
IPC分類
G06N3/063; G06N3/08; G11C11/24; G11C11/54
技術領域
capacitor,charge,first,gates,second,voltage,weight,analog,pre,stochastic
地域： NY NY Armonk

摘要

Systems and methods for a capacitor based resistive processing unit with symmetrical weight updating include a first capacitor that stores a charge corresponding to a weight value. A readout circuit reads the charge stored in the first capacitor to apply a weight to an input value corresponding to an input signal using the weight value to produce an output. An update circuit updates the weight value stored in the first capacitor, including a second capacitor in communication with the first capacitor to transfer an amount of charge to the first capacitor according to an error of the output by changing a voltage difference across the first capacitor by a voltage change corresponding to the amount of charge, the voltage difference corresponding to the charge stored in the first capacitor.

說明書

A charge of the first capacitor 202 is proportional to the voltage difference between the first node 361 and the second node 362. Therefore, the second capacitor 302 can be charged to a level for producing a voltage difference between the first node 361 and the second node 362 that corresponds to the desired charge change. In particular, the charge of the second capacitor 302 can be set as C2*(V0+ΔV). Therefore, the first and second pre-charge voltages 344 and 346 can be used to charge the second capacitor 302 to C2*(V0+ΔV) by setting a difference between the first and second pre-charge voltages 344 and 346 to be equivalent to the voltage difference V0 between the first node 361 and the second node 362 plus the change in voltage ΔV, or (V0+ΔV).

As a result, when the first and second pre-charge gates 322 and 324 open and the first and second transfer gates 326 and 328 close, an equilibrium between the first capacitor 202 and the second capacitor 302 is achieved whereby charge is transferred between the first and second capacitors 202 and 302 and the voltage change on first capacitor C1 equals to C2*ΔV/C1.

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