Abstract
To maintain a good spectral performance even at high readout speeds, active pixel sensors like the DEPFET need to be equipped with a storage functionality. Enhancing the frame rate to its limit—the readout time per pixel itself—the charge collection and the readout need to be separated spatially to avoid a significant degradation of the spectral performance. One implementation of a storage concept is the Infinipix DEPFET. The most promising Infinipix variant was investigated in greater detail to study the spectral performance for an array of 32×32 pixels. This includes the characterization of the temperature dependence and the contributions of the different noise components. With an optimal set of temperature and timing parameters, a spectrum taken with an iron-55 source was analyzed with high statistics and the energy response for different X-ray photon energies was evaluated.
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