Projects
BRENIAC Project
Goal: Model and simulate the neuromorphic behavior of a RRAM-based circuit realized for neuromorphic applications.
• A LTspice based memristor model is developed in collaboration with UAB (Universitat Autonoma de Barcelona).
• To test if the memristor model can be used in a neuromorphic circuit, certain basic measurement was done such as LTP and STDP.
• Using PySpice (combination of python and NGspice) is being used to realize the neuromorphic circuit.
![Neuromorphic_thumb.png](https://static.wixstatic.com/media/41f594_5ed97280d4bf4f14be123a28d624b9e7~mv2.png/v1/fill/w_491,h_331,al_c,q_85,usm_0.66_1.00_0.01,enc_auto/Neuromorphic_thumb.png)
Neuromorphic application of RRAM
RRAM is an emerging nonvolatile memory that depicts synaptic characteristics hence it can be used to replace the weights in a neural network.
• Ruthenium-based RRAM is being characterized for the application.
• A circuit is developed that can do basic pattern recognition.
• To test the extent of how well the device will function on a real-time application some simulations are also being done on a platform called NeuroSim.
![neuromorphic-computing-teaser.jpg](https://static.wixstatic.com/media/41f594_54d927fcde4a4c2c9da18ededa625ae0~mv2.jpg/v1/crop/x_0,y_30,w_1200,h_884/fill/w_490,h_361,al_c,q_80,usm_0.66_1.00_0.01,enc_auto/neuromorphic-computing-teaser.jpg)
RRAM characterization
• RRAM and CBRAM are one of the most promising non-volatile memories.
• The devices were fabricated in the cleanroom of CGU.
• The devices were characterized for their non-volatile nature using the B1500a semiconductor analyzer.
• Later for testing the neuromorphic characteristics (LTP, LTD, STDP, SRDP) of the devices, I programed B1500a.
• Various time-dependent and rate-dependent plasticity were discovered in the devices.
• Applications include in-memory computing, neuromorphic computing, TRNG, etc.
![Basic-RRAM-cell-structure-A-schematic-diagram-of-the-mechanism-of-the-resistive.png](https://static.wixstatic.com/media/41f594_594d96d67cfa4a1797a31bcd80dff5ad~mv2.png/v1/crop/x_43,y_0,w_557,h_410/fill/w_123,h_90,al_c,q_85,usm_0.66_1.00_0.01,blur_2,enc_auto/Basic-RRAM-cell-structure-A-schematic-diagram-of-the-mechanism-of-the-resistive.png)
Flexible Li-ion cell
Objective: To develop a pouch cell that can be used in wearable electronics.
• We synthesized Graphene using Tour’s method.
• We indigenously developed Glove box and spot-welding machine needed for the project.
• During this process I have learned using multiple equipments such as tubular furnace, muffel furnace, centrifuge, ultrasonic cleaner etc.
![Lithium Ion Cell 3.png](https://static.wixstatic.com/media/41f594_3002238b6bbb4d0baa20b9a937329069~mv2.png/v1/fill/w_116,h_83,al_c,q_85,usm_0.66_1.00_0.01,blur_2,enc_auto/Lithium%20Ion%20Cell%203.png)
Multi-junction Solar cell
• In generic solar cells, a single semiconductor is used for extracting energy from sunlight.
• Stacking multiple semiconductors increase the overall efficiency of the solar cell.
• We used AMPS-1D software to simulate multijunction solar cell.
![Multijunction-solar-cells.png](https://static.wixstatic.com/media/41f594_58056443f6934ca1bffc6270499151d6~mv2.png/v1/fill/w_123,h_71,al_c,q_85,usm_0.66_1.00_0.01,blur_2,enc_auto/Multijunction-solar-cells.png)