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CA2303022A1 - Low power current-to-frequency converter circuit for use in implantable sensors - Google Patents

Low power current-to-frequency converter circuit for use in implantable sensors

Info

Publication number
CA2303022A1
CA2303022A1 CA 2303022 CA2303022A CA2303022A1 CA 2303022 A1 CA2303022 A1 CA 2303022A1 CA 2303022 CA2303022 CA 2303022 CA 2303022 A CA2303022 A CA 2303022A CA 2303022 A1 CA2303022 A1 CA 2303022A1
Authority
CA
Grant status
Application
Patent type
Prior art keywords
signal
frequency
current
analog
low
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
CA 2303022
Other languages
French (fr)
Other versions
CA2303022C (en )
Inventor
John C. Gord
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Mann Alfred E Foundation for Scientific Research
Original Assignee
Alfred E. Mann Foundation For Scientific Research
John C. Gord
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date

Links

Classifications

    • HELECTRICITY
    • H03BASIC ELECTRONIC CIRCUITRY
    • H03KPULSE TECHNIQUE
    • H03K7/00Modulating pulses with a continuously-variable modulating signal
    • H03K7/06Frequency or rate modulation, i.e. PFM or PRM
    • AHUMAN NECESSITIES
    • A61MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61NELECTROTHERAPY; MAGNETOTHERAPY; RADIATION THERAPY; ULTRASOUND THERAPY
    • A61N1/00Electrotherapy; Circuits therefor
    • A61N1/18Applying electric currents by contact electrodes
    • A61N1/32Applying electric currents by contact electrodes alternating or intermittent currents
    • A61N1/36Applying electric currents by contact electrodes alternating or intermittent currents for stimulation
    • A61N1/372Arrangements in connection with the implantation of stimulators
    • A61N1/378Electrical supply

Abstract

A low power current-to-frequency converter circuit provides an output frequency signal F OUT having a frequency that varies as a function of a low level analog input current signal. The analog input current signal is typically generated by an implantable sensor element, designed to sense a particular substance or parameter within body tissue or fluids to which the sensor is exposed, with the magnitude of the analog signal providing a measure of the sensed substance or parameter.
Conversion of the low level analog current to the output frequency signal facilitates transmission of the data signal over a shared data bus and other digital processing of the data signal. The current-to-frequency converter circuit is fabricated from low power FET-based integrated circuits, and includes an operational amplifier having its positive input terminal connected to a storage capacitor that is charged by the analog input current signal, a voltage-controlled oscillator driven by the charge (voltage) on the storage capacitor that produces the output frequency signal, and a charge pump circuit that pumps a discrete amount of charge off of the storage capacitor during each cycle of the output frequency signal.
CA 2303022 1997-09-12 1998-09-11 Low power current-to-frequency converter circuit for use in implantable sensors Active CA2303022C (en)

Priority Applications (3)

Application Number Priority Date Filing Date Title
US08/928,868 1997-09-12
US08928868 US5917346A (en) 1997-09-12 1997-09-12 Low power current to frequency converter circuit for use in implantable sensors
PCT/US1998/018978 WO1999013574A1 (en) 1997-09-12 1998-09-11 Low power current-to-frequency converter circuit for use in implantable sensors

Publications (2)

Publication Number Publication Date
CA2303022A1 true true CA2303022A1 (en) 1999-03-18
CA2303022C CA2303022C (en) 2006-01-24

Family

ID=25456908

Family Applications (1)

Application Number Title Priority Date Filing Date
CA 2303022 Active CA2303022C (en) 1997-09-12 1998-09-11 Low power current-to-frequency converter circuit for use in implantable sensors

Country Status (6)

Country Link
US (1) US5917346A (en)
EP (1) EP1012974B1 (en)
JP (1) JP3958933B2 (en)
CA (1) CA2303022C (en)
DE (2) DE69819533T2 (en)
WO (1) WO1999013574A1 (en)

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EP1012974A1 (en) 2000-06-28 application
DE69819533T2 (en) 2004-09-30 grant
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DE69819533D1 (en) 2003-12-11 grant
JP2001516980A (en) 2001-10-02 application
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US5917346A (en) 1999-06-29 grant
WO1999013574A1 (en) 1999-03-18 application

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