First measurement on the DEPFET Mini-matrix particle detector system

The DEPFET is a new type of active pixel particle detector. A MOSFET is integrated in each pixel providing the first amplification stage of the readout electronics. Excellent noise parameters are obtained with this layout. The DEPFET sensor will be integrated as an inner detector in the BELLE II experiment. A flexible measuring system with a wide control cycle range and minimal noise was designed for testing small detector prototypes. Noise of 19 electrons of the equivalent input charge was achieved during the first measurements on the system.