We prove and demonstrate here for the example of the large scale pixeldetector of ATLAS that Serial Powering of pixel modules is a viable alternativeand that has been devised and implemented for ATLAS pixel modules usingdedicated on-chip voltage regulators and modified flex hybrids circuits. Theequivalent of a pixel ladder consisting of six serially powered pixel moduleswith about 0.3Mpixels has been built and the performance with respect to noiseand threshold stability and operation failures has been studied. We believethat Serial Powering in general will be necessary for future large scaletracking detectors.
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