Two wire oscillator system for determining body empedance
First Claim
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1. An apparatus for determining body impedance comprising:
- first and second electrodes suitable for being electrically coupled to the body; and
a variable frequency relaxation oscillator coupled to the electrodes;
wherein, the period of oscillation is indicative of the body impedance.
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Abstract
An apparatus for determining body impedance comprising: first and second electrodes suitable for being electrically coupled to the body; and a variable frequency relaxation oscillator coupled to the electrodes; wherein, the period of oscillation is indicative of the body impedance.
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Citations
18 Claims
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1. An apparatus for determining body impedance comprising:
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first and second electrodes suitable for being electrically coupled to the body; and
a variable frequency relaxation oscillator coupled to the electrodes;
wherein, the period of oscillation is indicative of the body impedance. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A method for calibrating an apparatus for determining body impedance having first and second electrodes being suitable for being electrically coupled to the body, comprising:
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determining a first period of oscillation for the apparatus associated with an open circuit condition between the electrodes; and
determining a second period of oscillation for the apparatus associated with a short-circuit condition between the electrodes;
wherein, the first period of oscillation is indicative of a first calibration value, and the second period of oscillation in combination with a slope coefficient is indicative of a second calibration value. - View Dependent Claims (11, 12)
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13. A method for measuring an impedance of a body, comprising:
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electrically coupling first and second electrodes to the body;
electrically biasing a variable frequency relaxation oscillator having both a negative feedback network comprising said electrodes, and a positive resistive feedback network; and
measuring the period oscillation of said variable frequency oscillator, wherein the measured period of oscillation is indicative of the impedance of the body. - View Dependent Claims (14, 15, 16, 17, 18)
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Specification