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• Journal article
  Banks DJ, Degenaar P, Toumazou C, 2007,
  , ELECTRON LETT, Vol: 43, Pages: 704-706, ISSN: 0013-5194

  A new design methodology is presented for outputting digital information from asynchronous analogue circuits, which allows signed frequency encoded signal transfer along a single channel. The circuit outputs data as a series of rate and pulse-width encoded spikes: pulse-width modulation is used to represent vector and pulse frequency modulation is used to represent magnitude symbiotically. This technique can be used to increase the bandwidth of multiplexed neural signals, such as for address event registration, or by using a time-to-first-spike system, to multiplex signals on a single channel. Additionally, feedback has been used to improve the switching speed of current starved inverters, reducing their power consumption by over an order of magnitude.

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• Journal article
  Cannillo F, Toumazou C, Lande TS, 2007,
  , ELECTRONICS LETTERS, Vol: 43, Pages: 662-664, ISSN: 0013-5194
  • Cite
  • Citations: 13
• Journal article
  Georgiou P, Toumazou C, 2007,
  , IEEE Transactions on Biomedical Circuits and Systems, Vol: 1, Pages: 39-49

  The paper will consider how silicon devices such as ion-sensitive field effect transistors can be used to model metabolic functions in biology. In a first example, a biologically inspired silicon beta cell is presented to serve as the main building block of an artificial pancreas. This is to be used for real-time glucose sensing and insulin release for diabetics. This system presents the first silicon implementation of a metabolic cell capable of exhibiting variable bursting behavior upon glucose stimulation. Based on the Hodgkin and Huxley formalism, this approach achieves dynamics similar to that of biological beta cells by using devices biased in the subthreshold regime. In addition to mimicking the physiological behavior of the beta cell, the circuit achieves good power efficiency, measured to be 4.5 uW

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• Journal article
  Triantis IF, Woods V, Eftekhar A, Georgiou P, Constandinou TG, Drakakis EM, Toumazou Cet al., 2007,

  Advances in Neural Interfacing

  , IEEE Circuits and Systems Society Newsletter, Vol: 1
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• Journal article
  Toumazou C, Shepherd L, 2007,
  , ELECTRONICS LETTERS, Vol: 43, Pages: 65-67, ISSN: 0013-5194
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  • Citations: 5
• Journal article
  Premanode B, Toumazou C, 2007,
  , SENSORS AND ACTUATORS B-CHEMICAL, Vol: 120, Pages: 732-735, ISSN: 0925-4005
  • Cite
  • Citations: 71
• Journal article
  Nikolic K, Grossman N, Yan H, Drakakis E, Toumazou C, Degenaar Pet al., 2007,

  A non-invasive retinal prosthesis - testing the concept.

  , Conference Proceedings Annual International Conference of the IEEE Engineering in Medicine and Biology Society IEEE Engineering in Medicine and Biology Society Conference, Pages: 6365-6368, ISSN: 1557-170X

  We have developed a testing platform for a novel type of retinal prosthesis. Our system uses an array of light sources as non-contact stimulators. The platform consists of an imaging system based on a CMOS camera, PC based image processing, and a stimulation address system carried out on a Field Programmable Gated Array which addresses a matrix array of LEDs. Special optics are used to focus the light from the LED array onto light sensitized cells.

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  • Citations: 8
• Conference paper
  Constandinou TG, Georgiou J, Doumanidis CC, Tournazou Cet al., 2007,
  , 3rd International IEEE/EMBS Conference on Neural Engineering, Publisher: IEEE, Pages: 40-+
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• Conference paper
  Li X, Constandinou TG, Eftekhar A, Georgiou P, Toumazou Cet al., 2007,
  , IEEE EMBS Conference on Neural Engineering, Publisher: Institute of Electrical and Electronics Engineers (IEEE), Pages: 85-88
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• Conference paper
  Cannillo F, Toumazou C, 2007,
  , IEEE International Symposium on Circuits and Systems, Publisher: IEEE, Pages: 3824-+, ISSN: 0271-4302
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• Conference paper
  Yue X, Drakakis EA, Ye H, Lim M, Mantalaris A, Panoskaltsis N, Radomska A, Toumazou C, Cass Tet al., 2007,
  , IEEE International Symposium on Circuits and Systems, Publisher: IEEE, Pages: 1215-+, ISSN: 0271-4302
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  • Citations: 1
• Conference paper
  Ho MMS, Lande TS, Toumazou C, 2007,
  , IEEE Biomedical Circuits and Systems Conference, Publisher: IEEE, Pages: 17-20
  • Cite
  • Citations: 1
• Conference paper
  Banks D, Degenaar P, Toumazou C, 2007,
  , IEEE International Symposium on Circuits and Systems, Publisher: IEEE, Pages: 2375-2378, ISSN: 0271-4302
  • Cite
  • Citations: 1
• Conference paper
  Huang Y, Drakakis EM, Toumazou C, 2007,
  , IEEE International Symposium on Circuits and Systems (ISCAS), Publisher: IEEE, Pages: 2359-2362, ISSN: 0271-4302
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• Conference paper
  Katsiri E, Ho M, Wang L, Lo B, Toumazou Cet al., 2007,

  Embedded real-time heart variability analysis

  , 4th International Workshop on Wearable and Implantable Body Sensor Networks (BSN 2007), Publisher: SPRINGER, Pages: 128-+, ISSN: 1680-0737
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  • Citations: 3
• Conference paper
  Georgiou P, Triantis IF, Constandinou TG, Toumazou Cet al., 2007,
  , IEEE EMBS Conference on Neural Engineering, Publisher: Institute of Electrical and Electronics Engineers (IEEE), Pages: 126-129
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• Conference paper
  Nikolic K, Grossman N, Yan H, Drakakis EM, Toumazou C, Degenaar Pet al., 2007,
  , 29th Annual International Conference of the IEEE Engineering in Medicine and Biology Society (EMBS), Publisher: IEEE, Pages: 6364-6367, ISSN: 1557-170X
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• Conference paper
  Yue X, Drakakis EM, Hua Y, Mayasari L, Mantalaris A, Panoskaltsis N, Radomska A, Toumazou C, Cass AEGet al., 2007,
  , IEEE International Symposium on Circuits and Systems (ISCAS), Publisher: IEEE, Pages: 1215-1218
  • Cite
• Conference paper
  Georgiou J, Constandinou T G, Toumazou C, 2007,

  A Micropower Cochlear Prosthesis System Demonstrator

  , IEEE International Symposium on Circuits and Systems, Publisher: IEEE
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• Conference paper
  Georgiou J, Constandinou TG, Toumazou C, 2007,
  , IEEE International Symposium on Circuits and Systems (ISCAS), Publisher: Institute of Electrical and Electronics Engineers (IEEE), Pages: 1219-1219
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