1. Online Data Processing and Hit Time Reconstruction for Silicon Detector Readout C. Irmler, M. Friedl, M. Pernicka
The KEKB factory (Tsukuba, Japan) will be upgraded until 2013 aiming at a target luminosity of 40 times the present value.
Accordingly, an increase of background is expected.
Replacement of the silicon vertex detector and its readout is neccessary.
We present a readout system for double sided silicon detectors using the APV25 chip and online data processing in order to achieve a low occupancy.
C. Irmler, M. Friedl, M. Pernicka
11th Pisa Meeting on Advanced Detectors, May 24-30, 2009

2. Online Data Processing and Hit Time Reconstruction for Silicon Detector Readout
The core function is implemented on a 9U VME board with 16 input channels.
It provides online data processing like common mode correction and zero suppression for all 16 inputs in parallel.
By taking 6 consecutive samples of the APV25 signal the timing of the hit can be reconstructed with a resolution of ns RMS.
 Offtime-background can be rejected
 Allows matching of hits across layers
The data processing methods and the benefits of the hit time reconstruction are discussed.
C. Irmler, M. Friedl, M. Pernicka
11th Pisa Meeting on Advanced Detectors, May 24-30, 2009