JP7442625B2 - 相変化メモリ・シナプスのプログラム中にドリフト係数外れ値を抑制すること - Google Patents
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Description
Claims (12)
- 相変化メモリ(PCM)デバイスのドリフト外れ値を抑制するためのコンピュータ実装方法であって、
制御装置によって前記PCMデバイスのコンダクタンスをプログラムすることを含み、前記プログラムすることは、
第1の時点において、前記PCMデバイスの前記コンダクタンスを第1のコンダクタンス値となるように構成することであって、前記第1の時点はプログラミング時点である、前記構成することと、
第1の事前補償時点において、前記PCMデバイスの前記コンダクタンスが、目標コンダクタンス値との差が所定閾値以内である第2のコンダクタンス値に変化していると判定することと、
第2の事前補償時点において前記コンダクタンスを再び測定することを含めて、第2の時点において、前記PCMデバイスを前記第1のコンダクタンス値となるようにプログラムし直すことと
を含む、コンピュータ実装方法。 - 前記第1の事前補償時点は前記プログラミング時点後の所定時間期間にある、請求項1に記載の方法。
- 前記第1の事前補償時点における前記目標コンダクタンス値は、前記プログラミング時点後の第2の所定期間を有する目標時間窓に基づいて決定され、前記PCMデバイスの前記コンダクタンスは前記目標時間窓内で特定の範囲内にあることが望まれる、請求項2に記載の方法。
- プログラムすることは、(i)前記第1の事前補償時点における前記第2のコンダクタンス値と(ii)前記目標コンダクタンス値との間の差が前記所定閾値未満になるまで継続される、請求項2に記載の方法。
- 前記プログラムすることは、
前記第1の事前補償時点において、前記第1の事前補償時点における前記第2のコンダクタンス値と前記目標コンダクタンス値との間の差が前記所定閾値未満であると判定することと、
第1のチェックポイントにおいて、前記PCMデバイスの前記コンダクタンスが第2の目標コンダクタンス値との差が前記所定閾値以内である第3のコンダクタンス値に変化していると判定することと、
前記コンダクタンスを再び測定することを含めて、第3の時点において、前記PCMデバイスを前記第1のコンダクタンス値となるようにプログラムすることと、を更に含む、請求項1に記載の方法。 - 前記第1のチェックポイントは前記プログラミング時点後の第2の所定時間期間にあたる、請求項5に記載の方法。
- 前記第1のチェックポイントにおける前記第2の目標コンダクタンス値は、前記プログラミング時点以降の第2の所定期間にあたる目標時間窓に基づいて決定され、前記PCMデバイスの前記コンダクタンスは前記目標時間窓内で特定の範囲内に維持される、請求項5に記載の方法。
- 前記PCMデバイスは人工ニューラル・ネットワーク・システムにおけるシナプスとして使用され、前記コンダクタンスは前記シナプスに割り当てられる重みである、請求項1に記載の方法。
- 前記PCMデバイスは複数のPCMデバイスを備え、前記複数のPCMデバイスの各々は対応する目標コンダクタンス値と関連付けられている、請求項1に記載の方法。
- 前記PCMデバイスの前記コンダクタンスはコンダクタンス・ドリフトに起因して前記第2のコンダクタンス値に変化する、請求項1に記載の方法。
- 制御装置と、1つまたは複数のクロスバー・アレイを備えるコプロセッサと、を備えるシステムであって、前記制御装置は前記コプロセッサを使用して人工ニューラル・ネットワークの層をクロスバー・アレイとマッピングすることによって前記人工ニューラル・ネットワークを実装するように構成されており、前記人工ニューラル・ネットワークを実装することは請求項1ないし10のいずれかに記載の方法を含む、システム。
- 相変化メモリ(PCM)デバイスのドリフト外れ値を抑制するよう、コンピュータの処理回路に、請求項1ないし10のいずれかに記載の方法を実行させる、コンピュータ・プログラム。
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US16/554,018 US11183238B2 (en) | 2019-08-28 | 2019-08-28 | Suppressing outlier drift coefficients while programming phase change memory synapses |
PCT/IB2020/056747 WO2021038334A1 (en) | 2019-08-28 | 2020-07-17 | Suppressing outlier drift coefficients while programming phase change memory synapses |
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