A multi-power source is described that provides power through a single source\u2014e. The temperature control means starts reading out an electric charge from each pixel, then converts the electric discharge to voltage with a charge amplifier and in a period until an AD conversion process for the voltage is completed, and restricts a variation in the voltage which is applied to the Peltier element. In embodiments, at least a portion of the matching network is formed off-chip and a portion of the matching network is formed on-chip.