Noise suppression in a sampling circuit

A method comprising:

• generating a first voltage on receiving an input signal through a pixel switch;
• sampling the first voltage on a second capacitor in a first sampling network and on a third capacitor and a fourth capacitor in a second sampling network;
• generating a signal voltage from the first voltage by the first sampling network;
• generating a second voltage when the pixel switch is opened;
• sampling the second voltage on the fourth capacitor in the second sampling network;
• generating a pixel sampled noise voltage from the first voltage and the second voltage by the second sampling network;
• and
• subtracting the pixel sampled noise voltage generated in a previous cycle from the signal voltage generated in a current cycle to generate a true signal voltage.

An imaging system comprising:

• an x-ray source configured to generate x-rays;
• an object configured to receive x-rays from the x-ray source, the x-rays pass through the object;
• and
• a receiver configured to receive attenuated x-rays from the object, the receiver comprising a plurality of detectors, and at least one detector of the plurality of detectors comprising:
• an integrator configured to receive an input signal;
• a first sampling network coupled to the integrator and configured to generate a signal voltage;
• and
• a second sampling network coupled to the integrator and configured to generate a pixel sampled noise voltage, wherein the pixel sampled noise voltage generated in a previous cycle is subtracted from the signal voltage generated in a current cycle to generate a true signal voltage.