The calibration of the transresistance gain of low-current dc amplifiers can be performed with the capacitance-charging method, where the calibration current is generated by a calibrated voltage ramp applied to a reference capacitor. The method is typically implemented with a purposely-built voltage source having a very low-frequency trapezoidal pe- riodic waveform output. Here we propose a variation of the method based on a sinusoidal excitation, that can be pro- vided by a commercial oscillator and therefore more easily implemented. Sampled sinusoidal input and output are pro- cessed with a seven-parameter sine-fitting algorithm. The comparison between calibration with sinusoidal and trape- zoidal excitations is ongoing and will be presented at the Conference.

Calibration system for low-current transresistance amplifiers with a low-frequency sinewave source / Ilaria, Finardi; Luca, Callegaro. - (2017). ((Intervento presentato al convegno XXXII International Union of Radio Science (URSI) General Assembly and Scientific Symposium Conference.

Calibration system for low-current transresistance amplifiers with a low-frequency sinewave source

Luca Callegaro
2017

Abstract

The calibration of the transresistance gain of low-current dc amplifiers can be performed with the capacitance-charging method, where the calibration current is generated by a calibrated voltage ramp applied to a reference capacitor. The method is typically implemented with a purposely-built voltage source having a very low-frequency trapezoidal pe- riodic waveform output. Here we propose a variation of the method based on a sinusoidal excitation, that can be pro- vided by a commercial oscillator and therefore more easily implemented. Sampled sinusoidal input and output are pro- cessed with a seven-parameter sine-fitting algorithm. The comparison between calibration with sinusoidal and trape- zoidal excitations is ongoing and will be presented at the Conference.
XXXII International Union of Radio Science (URSI) General Assembly and Scientific Symposium Conference
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11696/56733
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