SPICE compact modeling of bipolar/unipolar memristor switching governed by electrical thresholds

In this work we propose a physical memristor/resistive switching device SPICE compact model, that is able to accurately fit both unipolar/bipolar devices settling to its current-voltage relationship. The proposed model is capable of reproducing essential device characteristics such as multilevel storage, temperature dependence, cycle/event handling and even the evolution of variability/parameter degradation with time.The developed compact model has been validated against two physical devices, fitting unipolar and bipolar switching. With no requirement of Verilog-A code, LTSpice and Spectre simulations reproduce distinctive phenomena such as the preforming state, voltage/cycle dependent<br/

A circuit-level SPICE modeling strategy for the simulation of behavioral variability in ReRAM

© 2022 IEEE. Personal use of this material is permitted. Permission from IEEE must be obtained for all other uses, in any current or future media, including reprinting/republishing this material for advertising or promotional purposes,creating new collective works, for resale or redistribution to servers or lists, or reuse of any copyrighted component of this work in other works.The intrinsic behavioral variability in resistive switching devices (also known as 'memristors' or 'ReRAM devices') can be a reliability limiting factor or an opportunity for applications where randomness of resistance switching is essential, such as hardware security and stochastic computing. The realistic assessment of ReRAM-based circuits & systems towards practical exploitation requires variability-aware ReRAM modeling. In this context, here we present a versatile, circuit-level implementation strategy to incorporate cycle-to-cycle (C2C) variability to the ReRAM model parameters in SPICE simulations. We evaluated the proposed approach with threshold-based models of a voltage-controlled bipolar ReRAM device and managed to reproduce the main features observed in experimental curves for different pulsed voltage inputs. With key upgrades, compared to previous approaches found in the literature, our strategy enables the enhancement of any ReRAM device model towards the exploration of new ways to make the most of the C2C ReRAM variability, and to test the robustness of any designed circuits & systems against ReRAM variability.Supported by the Chilean research grants ANID-Basal FB0008 and FONDECYT Regular 1221747, and by the Spanish MCIN/AEI/10.13039/501100011033 grant PID2019-103869RB-C33.Peer ReviewedPostprint (author's final draft

Programmable mixed-signal circuits

A novel concept for programmable mixed-signal circuits is presented based on programmable transmission gates. For implementation, memristively switching devices are suggested as the most promising candidates for realization of fast and small-footprint signal routing switches with small resistance and capacity. As a proof-of-concept, LT Spice simulations of digital and analogue example circuits implemented by the new concept are demonstrated. It is discussed how important design parameters can be tuned in the circuity. Compared to competing technologies such as Field Programmable Analogue Arrays or Application-Specific Integrated Circuits, the presented concept allows for development of ultra-flexible, reconfigurable, and cheap embedded mixed-signal circuits for applications where only limited space is available or high bandwidth is required