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 Download PDF

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Publication number
CA2303022A1
CA2303022A1 CA002303022A CA2303022A CA2303022A1 CA 2303022 A1 CA2303022 A1 CA 2303022A1 CA 002303022 A CA002303022 A CA 002303022A CA 2303022 A CA2303022 A CA 2303022A CA 2303022 A1 CA2303022 A1 CA 2303022A1
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CA
Canada
Prior art keywords
signal
output frequency
low power
converter circuit
current
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Granted
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CA002303022A
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French (fr)
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CA2303022C (en
Inventor
John C. Gord
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Alfred E Mann Foundation for Scientific Research
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Individual
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Publication of CA2303022A1 publication Critical patent/CA2303022A1/en
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Publication of CA2303022C publication Critical patent/CA2303022C/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03K—PULSE TECHNIQUE
    • H03K7/00—Modulating pulses with a continuously-variable modulating signal
    • H03K7/06—Frequency or rate modulation, i.e. PFM or PRM
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61N—ELECTROTHERAPY; MAGNETOTHERAPY; RADIATION THERAPY; ULTRASOUND THERAPY
    • A61N1/00—Electrotherapy; Circuits therefor
    • A61N1/18—Applying electric currents by contact electrodes
    • A61N1/32—Applying electric currents by contact electrodes alternating or intermittent currents
    • A61N1/36—Applying electric currents by contact electrodes alternating or intermittent currents for stimulation
    • A61N1/372—Arrangements in connection with the implantation of stimulators
    • A61N1/378—Electrical 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.
CA002303022A 1997-09-12 1998-09-11 Low power current-to-frequency converter circuit for use in implantable sensors Expired - Lifetime CA2303022C (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
US08/928,868 US5917346A (en) 1997-09-12 1997-09-12 Low power current to frequency converter circuit for use in implantable sensors
US08/928,868 1997-09-12
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 CA2303022A1 (en) 1999-03-18
CA2303022C CA2303022C (en) 2006-01-24

Family

ID=25456908

Family Applications (1)

Application Number Title Priority Date Filing Date
CA002303022A Expired - Lifetime CA2303022C (en) 1997-09-12 1998-09-11 Low power current-to-frequency converter circuit for use in implantable sensors

Country Status (7)

Country Link
US (1) US5917346A (en)
EP (1) EP1012974B1 (en)
JP (1) JP3958933B2 (en)
AU (1) AU9314698A (en)
CA (1) CA2303022C (en)
DE (1) DE69819533T2 (en)
WO (1) WO1999013574A1 (en)

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