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Title:
CURRENT SENSING MULTIPLE OUTPUT CURRENT STIMULATORS WITH FAST TURN ON TIME
Document Type and Number:
WIPO Patent Application WO/2014/146016
Kind Code:
A3
Abstract:
A multiple output current stimulator circuit with fast turn on time is described. At least one pair of input side and output side transistors is arranged in a current mirror connected to a supply transistor by cascode coupling. The output side transistor supplies stimulation current to an electrode in contact with tissue. An operational amplifier connected to a reference voltage and to the output side transistor drives the supply transistor to maintain the voltage at the output side transistor equal to the reference voltage. The at least one pair of transistors includes multiple pairs of transistors whose output side transistors drive respective electrodes with stimulation currents. The stimulator determines the initiation and duration of stimulation current pulses supplied to each electrode. At circuit activation, large currents are generated which discharge capacitances in the output side transistors causing rapid output side transistor turn on.

Inventors:
LEE, Edward K. F. (1819 Catlin Street, Fullerton, California, 92833, US)
Application Number:
US2014/030886
Publication Date:
January 22, 2015
Filing Date:
March 17, 2014
Export Citation:
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Assignee:
ALFRED E. MANN FOUNDATION FOR SCIENTIFIC RESEARCH (P. O. Box 905, Santa Clarita, California, 91380, US)
International Classes:
H03K3/012; A61N1/36; G05F3/26; H03K17/00; H03K17/042
Foreign References:
US20120071950A12012-03-22
US4673867A1987-06-16
Other References:
HUMAYUN M S ET AL: "A Variable Range Bi-Phasic Current Stimulus Driver Circuitry for an Implantable Retinal Prosthetic Device", IEEE JOURNAL OF SOLID-STATE CIRCUITS, IEEE SERVICE CENTER, PISCATAWAY, NJ, USA, vol. 40, no. 3, 1 March 2005 (2005-03-01), pages 763 - 771, XP011128283, ISSN: 0018-9200, DOI: 10.1109/JSSC.2005.843630
BOIOCCHI S ET AL: "Self-calibration in high speed current steering CMOS D/A converters", ADVANCED A-D AND D-A CONVERSION TECHNIQUES AND THEIR APPLICATIONS, 199 4. SECOND INTERNATIONAL CONFERENCE ON CAMBRIDGE, UK, LONDON, UK,IEE, UK, 1 January 1994 (1994-01-01), pages 148 - 152, XP006512784, ISBN: 978-0-85296-617-4, DOI: 10.1049/CP:19940558
CHUA-CHIN WANG ET AL: "A 140-dB CMRR Low-noise Instrumentation Amplifier for Neural Signal Sensing", CIRCUITS AND SYSTEMS, 2006. APCCAS 2006. IEEE ASIA PACIFIC CONFERENCE ON, IEEE, PISCATAWAY, NJ, USA, 1 December 2006 (2006-12-01), pages 696 - 699, XP031070930, ISBN: 978-1-4244-0387-5
Attorney, Agent or Firm:
CHRISTIANSEN, Richard B. (Kilpatrick Townsend & Stockton LLP, Two Embarcadero Center Eighth Floo, San Francisco California, 94111, US)
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