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• Conference paper
  Huang Y, Drakakis EM, Toumazou C, 2007,

  A Wide Tuning-Range CMOS Oscillator for An Optoelectronic Retinal Prosthesis System

  , IEEE ISCAS 2007
  • Cite
• Conference paper
  Shepherd L, Georgiou P, Toumazou C, 2007,
  , IEEE International Symposium on Circuits and Systems, Publisher: IEEE, Pages: 3331-+, ISSN: 0271-4302
  • Cite
  • Citations: 33
• Conference paper
  Eftekhar A, Constandinou TG, Triantis IF, Toumazou C, Drakakis EMet al., 2007,
  , 3rd International IEEE/EMBS Conference on Neural Engineering (CNE), Publisher: IEEE, Pages: 438-441
  • Cite
• Journal article
  Georgiou P, Constandinou TG, Toumazou C, 2006,
  , Electronics Letters, Vol: 42, Pages: 1331-1332, ISSN: 0013-5194
  • Cite
• Journal article
  Premanode B, Chan WP, Toumazou C, 2006,
  , ELECTRONICS LETTERS, Vol: 42, Pages: 1264-1265, ISSN: 0013-5194
  • Cite
  • Citations: 8
• Conference paper
  nikolic K, Degenaar P, Toumazou C, 2006,

  Modeling and Engineering aspects of ChannelRhodopsin2 System for Neural Photostimulation

  , Engineering in Medicine and Biology Society, 2006. EMBS '06. 28th Annual International Conference of the IEEE, Publisher: IEEE, Pages: 1626-1629
  • Cite
• Journal article
  Purushothaman S, Toumazou C, Ou CP, 2006,
  , SENSORS AND ACTUATORS B-CHEMICAL, Vol: 114, Pages: 964-968
  • Cite
  • Citations: 66
• Patent
  Toumazou C, Georgiou J, 2006,

  Reference Circuit

  , US2006/0033557A1; US7242241B2

  A reference circuit comprising first and second field effect transistors connected to form a first current mirror, and a third and fourth field effect transistors connected to form a second current mirror, wherein a property of the first transistor is mismatched relative to the second transistor such that the threshold voltage of the first transistor is significantly higher than the threshold voltage of the second transistor, and the drain current versus gate-source voltage responses of the first and second transistors have substantially different gradients for current levels at which the reference current is operated.

  • Abstract
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• Journal article
  Degenaar P, Constandinou TG, Toumazou C, 2006,
  , Electronics Letters, Vol: 42, Pages: 196-198, ISSN: 0013-5194

  An adaptive spike generator circuit for intelligent vision chips is presented. A pulse frequency modulation spike encoder, capable of providing very high dynamic ranges with power consumption similar to an animal retina, has been developed. The circuit is inspired by the ON-OFF opponency algorithm used by the human eye.

  • Abstract
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• Patent
  Toumazou C, 2006,

  CMOS Current Mode Logic Circuits Using Subthreshold Conduction for Low Power Operation

  , GB2416255 (A)

  The switching transistors in a low-power CMOS current-mode logic circuit are biased to operate in weak inversion. The current-switching structure reduces noise and sensitivity to the process, voltage and temperature (PVT) variations which affect conventional subthreshold CMOS logic circuits. In retinal or cochlear implants analogue circuits operate in weak inversion to achieve low power, and by using current-mode logic satisfactory mixed analogue and digital low-power integrated circuits can be implemented. The logic swing is low and the data rate can be high. The current source Q1 operates in saturated weak inversion. The symmetry of the current-steering branches reduces input pattern sensitivity. A full adder is illustrated.

  • Abstract
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• Conference paper
  Constandinou TG, Toumazou C, 2006,
  , IEEE International Symposium on Circuits and Systems (ISCAS), Publisher: Institute of Electrical and Electronics Engineers (IEEE), Pages: 943-946
  • Cite
• Conference paper
  Yan Huang, Emmanuel Drakakis, Chris Toumazou, Konstantin Nikolic, and Patrick Degenaaret al., 2006,
  , IEEE BioCAS, Biomedical Circuits and Systems Conference, Publisher: IEEE, Pages: 110-113
  • Cite
• Conference paper
  Georgiou P, Toumazou C, 2006,
  , IEEE International Symposium on Circuits and Systems, Publisher: IEEE, Pages: 173-+, ISSN: 0271-4302
  • Cite
• Conference paper
  Nikolic K, Degenaar P, Toumazou C, 2006,

  Modeling and engineering aspects of ChannelRhodopsin2 system for neural photostimulation

  , 28th Annual International Conference of the IEEE-Engineering-in-Medicine-and-Biology-Society, Publisher: IEEE, Pages: 651-654
  • Cite
  • Citations: 22
• Conference paper
  Nikolic K, Degenaar P, Toumazou C, 2006,

  Modeling and Engineering Aspects of ChannelRhodopsin2 System for Neural Photostimulation

  , 28th IEEE Engineering in Medicine and Biology Society Conference, Pages: 1626-1629
  • Cite
• Conference paper
  Yue X, Drakakis EM, Toumazou C, Ye H, Mantalaris A, Radomska A, Cass AEGet al., 2006,
  , IEEE Biomedical Circuits and Systems Conference (BioCAS), Publisher: IEEE, Pages: 106-109
  • Cite
• Journal article
  Constandinou TG, Toumazou C, 2006,
  , Solid-State Circuits, IEEE Journal of, Vol: 41, Pages: 1430-1443, ISSN: 0018-9200
  • Cite
• Conference paper
  constandinou TG, Degenaar P, Toumazou C, 2006,
  , 2006 IEEE International Symposium on Circuits and Systems, Publisher: IEEE, Pages: 3566-3569
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• Journal article
  Shepherd LM, Toumazou C, 2005,
  , IEEE TRANSACTIONS ON CIRCUITS AND SYSTEMS I-REGULAR PAPERS, Vol: 52, Pages: 2614-2619, ISSN: 1057-7122
  • Cite
  • Citations: 42
• Journal article
  Lande TS, Lian Y, Toumazou C, 2005,
  , IEEE TRANSACTIONS ON CIRCUITS AND SYSTEMS I-REGULAR PAPERS, Vol: 52, Pages: 2511-2514, ISSN: 1549-8328
  • Cite
  • Citations: 1

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