STDP pulse design method based on multi-value memristor and implementation method of diversified STDPs

Abstract

The invention discloses a STDP pulse design method based on a multi-value memristor and an implementation method of diversified STDPs. According to the pulse design method, a synaptic pre-pulse and asynaptic post-pulse are designed into triangular waves with the same waveform, the selecting of the amplitude values of the triangular waves and the time interval of the front and rear triangular waves is determined by the amplitude value of the tested pulse and the pulse width threshold response range, and the pulse design of the STDP synaptic plasticity is simplified. According to the implementation method of the diversified STDP synaptic plasticity, different resistance states are selected as initial resistance states, and the design pulses are superposed on and applied to the memristor, sothat the STDP synaptic plasticity of the biological index attenuation type and the STDP synaptic plasticity different from the biological index attenuation type are realized, thereby realizing diversification of STDP synaptic plasticity. The method is expected to be applied to any kind of multi-value memristor and further expands the application of the memristor in the calculation of artificial synapse and nerve morphology.

Description

technical field [0001] The invention belongs to the technical field of microelectronic devices, and more particularly, relates to a multi-valued memristor-based STDP pulse design method and a diversified STDP realization method. Background technique [0002] Memristors have attracted widespread attention in the field of new synaptic bionic electronic devices due to their unique nonlinear electrical properties similar to neural synapses, as well as their simple structure and high integration. When the memristor is used to realize the time-dependent synaptic plasticity (Spike-timing-dependent plasticity, STDP) function of electrical pulse activity, the pulse signal applied to the upper electrode and the lower electrode is regarded as a pre-synaptic stimulus and a post-protrusion, respectively. stimulation, and then achieve STDP by designing the pulse signal. There are also two types of design methods for pulse signals, one uses the voltage superposition of two pulse signals, ...

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Problems solved by technology

[0008] It can be seen that there are many deficiencies in the research on memristors as synaptic devices in the prior art: (1) The pulses used to realize STDP synaptic plasticity are different, and the presynaptic design pulses are different from the postsynaptic design pulses. The pulse waveforms are different, and there is no unified standard; (2) to achieve a single, traditional biological exponential decay type STDP synaptic plasticity, which cannot meet the needs of other types of STDP plasticity forms different from the biological exponential decay form; (3) to achieve STDP Spike design for synaptic plasticity methods lacks means of concretization

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