Measurement circuit for bolometric detector

A circuit comprising at least one resistive sensor and at least one circuit for measuring a current Ibol flowing through a resistive sensor, comprising:

• an integrator of information representative of the difference between a current flowing through the sensor and a first reference current during an integration period;
• an analog-to-digital converter receiving the output of the integrator and outputting a digital output word over at least one bit, at the rate of a sampling control signal;
• a digital-to-analog converter connected to the output of the analog-to-digital converter and delivering said first reference current, the value of the first reference current being a function of the value of the digital word present on the output of the analog-to-digital converter;
• the first reference current being capable of taking at least one first value smaller than current Ibol and at least one second value greater than current Ibol;
• and
• wherein the analog-to-digital converter delivers a series of a plurality of digital words at the sampling frequency, during the integration period, the series of digital words being representative of current Ibol.