Search results for "Common-mode rejection ratio"

showing 2 items of 2 documents

Active power analog front-end based on a Wheatstone-type magnetoresistive sensor

2011

Abstract In the proposed work a practical magnetoresistive wattmeter based on a commercial sensor is designed to measure active power at industrial frequencies. The electronic conditioning circuit uses differential blocks in order to preserve the sensor initial common mode rejection ratio. A 700 W power level has been reached with an uncertainty less than 1%. With few changes the proposed circuitry could be used in metering applications.

EngineeringWheatstone bridgebusiness.industryMetals and AlloysElectrical engineeringWattmeterAC powerCondensed Matter PhysicsAnalog multiplierSurfaces Coatings and FilmsElectronic Optical and Magnetic Materialslaw.inventionAnalog front-endCommon-mode rejection ratioElectricity meterlawElectronic engineeringMetering modeElectrical and Electronic EngineeringbusinessInstrumentationSensors and Actuators A: Physical
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A novel technique for the CMRR improvement in a portable ECG system

2017

This paper presents a new technique to improve the quality of the ECG signals, increasing the Common Mode Rejection Ratio (CMRR). We developed a portable wireless Bluetooth ECG system able to acquire 12 leads, communicating with Smartphones and PCs. Many experiments have been made for measuring CMRR decay due to the difference on skin-electrodes impedances, the asymmetries of the amplifiers input stages and external components. Using some digital potentiometers, the system is able to compensate for these, increasing the CMRR of about 18 dB.

Portable Electronicsbusiness.industryComputer scienceECGAmplifierBioelectronicDigital potentiometerSettore ING-INF/01 - Elettronicalaw.inventionBluetoothProgrammable-gain amplifierCommon-mode rejection ratiolawElectronic engineeringWirelessCommon-mode signalEmbedded SystembusinessElectrical impedance
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