Integrate and Fire (I&F) as an ADC

Adviser : Prof. John G. Harris and Prof. Jose C. Principe

Project Description (What)

We propose to use a biologically inspired circuit called as Integrate and Fire as an Analog-to-digital (ADC) replacement. I&F circuit is asynchronous, meaning it has no clocks, as compared to the conventional ADCs. The asynchronous property leads to a significantly lower output data rate and lower power consumption as against conventional ADCs. I&F trades off bandwidth and power for a more complex recovery mechanism. We have successfully used the I&F as a data encoder in neural recording applications and now trying to use it as a sampler for massive sensor networks.

Collaborators (With Whom)

• Alexander Singh Alvarado - Working on various signal processing techniques for reconstructing the original signals from the asynchronous samples.
• Jie Xu (Jessie) - Worked on the front-end electronics, low-noise amplifiers and V-I (Gm) for neural signals.

When, Why and Where

• From May 2007 - May 2012
• As part of my PhD research
• at the Computational Neuro-Engineering Research (CNEL), ECE Dept., University of Florida

Tags : Asynchronous analog to digital converters, Asyncronous ADCs, Asynchronous samplers, asynchronous encoders, Integrate and Fire neuron as an encoder, Integrate and Fire neuron (I&F neuron) (I and F neuron) . FWIRE project, Integrate and Fire ADC.

Presentation and Publications

• Manu Rastogi. Design Optimizations of Spiking Hardware Neurons.Ph.D Thesis, University of Florida, 2012[link]
• Manu Rastogi , Vaibhav Garg, John G. Harris. Low power integrate and fire circuit for data conversion. In: 2009 IEEE International Symposium on Circuits and Systems. IEEE; 2009:2669-2672. [link]
• Sheng Feng Yen, Jie Xu, Manu Rastogi , et al. An integrated recording system using an asynchronous pulse representation. In: 2009 4th International IEEE/EMBS Conference on Neural Engineering. IEEE; 2009:399-402. [link] .
• Sheng Feng Yen, Jie Xu, Manu Rastogi, et al. A biphasic integrate-and-fire system. In: 2009 IEEE International Symposium on Circuits and Systems. IEEE; 2009:657-660. [link]
• John G. Harris , Manu Rastogi , Alexander Singh-Alvarado , et al. Real time signal reconstruction from spikes on a digital signal processor. In: 2008 IEEE International Symposium on Circuits and Systems. IEEE; 2008:1060-1063. [link]
• Manu Rastogi, Alexander Singh Alvarado , John G. Harris , JC Principe . Integrate and Fire Circuit as an ADC replacement. In: 2011 IEEE International Symposium on Circuits and Systems. [link] Best Paper Award given by the Neural Systems and Applications Technical Committee (NSATC)
• Alexander Singh Alvarado, Manu Rastogi, John G. Harris, JC Principe. The Integrate-and-Fire Sampler: A Special Type of Asynchronous Σ - Δ Modulator. In: 2011 IEEE International Symposium on Circuits and Systems [link]
• Real time signal reconstruction from spikes on a digital signal processor, IEEE International Symposium on Circuits and Systems, Seattle, 2008. [pdf]
• I&F Circuit for speech encoding. Presented to the panel on NSF-Partnership for Innovation Program headed by University of Florida, Dean College of Engineering, 2008.
• Low Power Integrate and Fire Circuit for Data Conversion, IEEE International Symposium on Circuits and Systems, Taiwan, 2009.
• Low Power circuits and models for asynchronous pulse representation of Continuous signals. Circuit Modeling Group, Intel Design and Technology Solutions Organization, Portland, Oregon, 2011.
• The Integrate-and-Fire Sampler: a Special Type of Asynchronous Sigma-Delta Modulator, IEEE International Symposium on Circuits and Systems, Brazil, 2011.
• The Integrate-and-Fire Circuit as an ADC replacement, IEEE International Symposium on Circuits and Systems, Brazil, 2011. [pdf]
• Design Optimizations for Spiking Hardware Neurons, ASIC Design, Corporate R&D, Qualcomm Research, San Diego, 2011 [pdf]