Reza Ramezani

Newcastle University | NCL · School of Electrical and Electronic Engineering

Brain-machine Interfaces (BMI) hold great potential for treating neurological disorders such as epilepsy. Technological progress is allowing for a shift from open-loop, pacemaker-class, intervention towards fully closed-loop neural control systems. Low power programmable processing systems are therefore required which can operate within the thermal...

Brain-machine Interfaces (BMI) hold great potential for treating neurological disorders such as epilepsy. Technological progress is allowing for a shift from open-loop, pacemaker-class, intervention towards fully closed-loop neural control systems. Low power programmable processing systems are therefore required which can operate within the thermal...

This paper proposes design considerations that need to be followed in order to eliminate potential sources of artefact that could distort a recorded neural signal. The artefact that appears in a recorded signal has a combination of potential sources each of which contributes towards its formation. As such, these sources of artefact have been addres...

Neuromodulation technologies are progressing from pacemaking and sensory operations to full closed-loop control. In particular, optogenetics—the genetic modification of light sensitivity into neural tissue allows for simultaneous optical stimulation and electronic recording. This paper presents a neural interface application-specified integrated ci...

This paper proposes a self-diagnostic subsystem for a new generation of brain implants with active electronics. The primary objective of such probes is to deliver optical pulses to optogenetic tissue and record the subsequent activity, but lifetime is currently unknown. Our proposed circuits aim to increase the safety of implanting active electroni...

Optogenetics is a gene-therapy technique which utilizes high radiance light to stimulate the genetically modified nerve cells. An optical delivery method in brain tissue for optogenetics can be performed using incorporated micro-LEDs. Optrode lifespan can be affected by the electrodes degradation caused by the generated charges over the tissue afte...

Implantable neuro-prosthetics considerable clinical benefit to a range of neurological conditions. Optogenetics is a particular recent interest which utilizes high radiance light for photo-activation of genetic cells. This can provide improved biocompatibility and neural targeting over electrical stimuli. To date the primary optical delivery method...

SUMMARYA new model to predict the dynamic behavior of a self-timed autonomous digital system powered by a capacitor is derived. The model demonstrates the hyperbolic shape of the discharging process on the capacitor. It allows a symbolic analysis of the discharging process for complex digital loads comprised of series (stack) and parallel configura...

Operation elasticity due to the proportional relationship between energy and switching activity of asynchronous circuits has made them hugely attractive for energy harvesting systems. Using asynchronous logic makes it possible to minimize the power regulation efforts and instead, supply the circuit directly from the energy storage while a proper lo...

In future systems with relatively unreliable and unpredictable energy sources such as harvesters, the system power supply may become non-deterministic. For energy effective operations, Vdd is an important parameter in any meaningful system control mechanism. Reliable and accurate on-chip voltage sensors are therefore indispensible for the power and...

A conventional computational system architecture is formed by a processor which executes tasks and a management unit which controls the task execution routine according to a required strategy. Different strategies (or task scheduling schemes) are developed to maximize system performance. The system performance can be maximized according to the spec...

Energy harvesting generators deliver nondeterministic power density over a range of explicit environmental conditions. To mitigate the variability of power provided by the harvesters, this paper presents a novel energy-proportional design approach, in which the computational circuit is driven by input power so that its switching activity is a funct...

This patent provides a circuit that employs the power supply directly as input to drive the asynchronous circuit. In contrast to conventional ADC designs, where a constant power supply (Vdd) is required, the present ADC in this invention uses the charge in a small capacitor as a power supply (Vdd) to drive the asynchronous counter and, simultaneous...