Wednesday 24 June 2009 -- To be held in Pickavance Lecture Theatre, R22, RAL Speaker: Marcel Trimpl (Fermilab) Title: Serial Powering for Front End Electronics Abstract: Serial powering is an elegant solution to power the SLHC inner trackers with a minimum volume of cables. So far R&D on serial powering for silicon strip modules was based on discrete commercial electronics. The SPi serial powering interface chip addresses this issue and makes available a range of custom radiation-hard serial powering blocks including shunt regulators, shunt transistors, linear regulators and LVDS buffers for AC coupling of data and control signals. SPi is a joint project of FNAL, Penn and RAL. The chip is designed to be very flexible and could be used for both pixel and strips detectors in 250 or 130 nm technology. The chip is currently being characterized at FNAL and RAL and will be a key component for the next ATLAS SLHC supermodule prototype. Marcel Trimpl, the lead designer, will give a brief introduction of serial powering and then describe the design choices and characterization results.