Impedance measuring device
OwnerJung Jin Hwang, Young Dae Seoinventors
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Abstract
The present invention relates to an impedance measuring device obtaining impedance of portions of an object corresponding to two sensing electrodes by detecting, through the two sensing electrodes, an electrical variation shown on the object as an electrical signal is applied. A detector amplifying each of signals detected through the two sensing electrodes and then differential-operating the amplified signals to generate a signal for obtaining impedance is subjected to a calibration process for adjusting the gain of the amplifiers to reduce in-phase noise added due to an imbalance between the sensing electrodes.
Claims7
An impedance measuring device, comprising;
- a signal applying unit applying a driving signal for measuring impedance between two driving electrodes spaced apart from each other and contacting an object;
- a detector amplifying, by an amplifier, each of signals detected through two sensing electrodes by applying the driving signal by amplifiers and differential-operating the amplified signal by a differential operator, the two sensing electrodes spaced apart from each other and contacting the object;
- and
- an impedance obtaining unit outputting impedance of the object corresponding to the two sensing electrodes based on an output signal of the detector,
- wherein the impedance measuring device further comprises an operating unit extracting power of an in-phase noise mixed with the output signal of the detector, adjusting a gain of the amplifier of the detector to decrease the power of the in-phase noise, and then obtaining an impedance based on the output signal of the detector obtained by applying the adjusted gain.
Dependencies are inferred from the claim text.