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The CMOS double-pair as a translinear element

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Submitted by winstead on Wed, 12/25/2013 - 06:11

The LE/FT lab has some experience with analog translinear circuit design, having spent several years investigating analog decoders and subthreshold circuits for implementing Bayesian inference with applications in forward error correction. One of the major difficulties with subthreshold analog computation is that the circuits require well-balanced differential signal processing. This balance is upset by device mismatch, an inevitable consequence of manufacturing homepage. Although our research has largely moved away from current-mode subthreshold processing, we recently proposed a novel mismatch-tolerant circuit approach based on the CMOS double-pair topology. Gopal Sundar used this approach to develop an improved winner-take all (WTA) circuit, as described in his recent MWSCAS article. This blog post presents the basic theory of the CMOS double-pair, its application in translinear computation, and its comparative sensitivity to mismatch.

Evaluating and Comparing BER Performance

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Submitted by winstead on Thu, 11/28/2013 - 08:48
One of my pet peeves with error correction research is that people frequently omit important details about bit error rate (BER) measurements. The BER performance is used to evaluate the quality of an algorithm, and to compare it against other competing algorithms. But sometimes two algorithms are very close in performance, and it is tempting to say, "my algorithm is best," even if it is only better by a small fraction. This can be problematic because BER is a statistical estimate, and the precise value is always a little uncertain.

Experiences at EMBC 2013

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Submitted by toribio on Sat, 11/23/2013 - 04:29

David Toribio, a recent LEFT lab alumnus, describes his experiences at the 2013 IEEE Engineering in Medicine and Biology Conference in Osaka, Japan. David presented research results from his MS thesis. He is now enrolled as a PhD student at the University of Miami. Read David's article here, and view his presentation slides here.

I really enjoyed my trip to EMBC '13 and would really recommend anyone to attend EMBC conferences, in the future. I am hoping that I can attend many more EMBC conferences in the future, even if I am not presenting or publishing work. The conference was a great source of inspiration for me, to keep pursuing my Biomedical Engineering (BME) degree, and to try to keep doing my best in the field. I was really amazed about how many different topics were covered in EMBC. You can really get to learn about the major findings in all the topics related to BME, in this conference. And even better, you can get to learn about these topics from the most experienced scholars in the field. Since my favorite BME sub-field is neuro-engineering, I signed up for the International Neuro-Technology workshop, which was held during the opening day before the conference started. Last year, when trying to decide about which school to apply, for pursuing a PhD, I read about the projects of many of the most successful researchers in neuro-engineering. So, it was very exciting for me to see that many of these researchers that I had read about, were giving talks in this neuro-engineering workshop. Moreover, I really liked this workshop, because I was also able to learn about the latest findings of one of the most experienced researchers in opto-genetics, which is one of the main technologies used in my PhD thesis.

PresentationPresenting my research at EMBC.

 

Making a better TMR

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Submitted by winstead on Sat, 12/22/2012 - 09:12

All electronic and computing systems are sensitive to various types of errors. For several decades, a simple procedure known as Triple Modular Redundancy (TMR) has been a leading technique for producing highly error-resilient systems (see the Wikipedia entry on TMR). TMR is based on a simple idea: make three independently-running copies of any computing module or system. Each copy gets the same inputs. Then, at the output, take a majority vote to determine the answer.

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