Current integrator circuit with capacitor calibration

Abstract

The present invention discloses a configurable current integrator circuit with capacitor calibration. The circuit comprises a capacitor array, a comparator, an integration switch and an integrating amplifier, wherein a capacitor calibration module composed of the capacitor array, the comparator and a successive approximation logic adjusts the capacitor array through a calibration process, thus to obtain accurate capacitance. The integrating amplifier realizes current integration by connecting with the calibrated capacitor array, thus to obtain accurate integrated voltage. Therefore, the current integrator with the above circuit can realize accurate current integration effects through the calibration module.

Description

technical field [0001] The invention generally relates to the field of X-ray image detection, in particular to a current integrator circuit with automatic capacitance calibration. Background technique [0002] In the field of X-ray image detection, a typical X-ray image detector usually includes a photoelectric converter array, a conversion circuit, and a digital transmission circuit with a communication port. Uniformly incident X-rays irradiate the measured object, and the X-ray image detector is used to receive the transmitted X-rays, and the photoelectric conversion array converts the X-ray signals directly into current signals, because the X-rays received by the X-ray image detector are in different The spatial positions of the photoelectric converters have different intensity distributions, so the photoelectric converter array will also obtain current signals of different sizes at different spatial positions, and the spatial distribution of these current signal intensit...

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Problems solved by technology

[0004] The purpose of the present invention is to solve the problem that the conventional current integrator is used in the field of detection and imaging. Due to the inaccuracy of the integral capacitance, there is a deviation in the voltage of the integrator, thereby reducing the imaging effect.

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