PSI - 11 Feb Status of the electronic systems of the MEG Experiment PSI - 11 Feb Topics HV Splitter Trigger Domino Ring Sampler PSI - 11 Feb HV Original design works V Microcontroller crashes if HV load changes quickly Redesign started in Nov. 03 Improved sensitivity 16-bit DACs, 24-bit ADCs (linear LTC2600, analog device AD7718) Faster microcontroller for 4 channels (silabs C8051F310) HV part optically decoupled from microcontroller Communication always through the MSCB Prototype in March 04 PSI - 11 Feb Splitters Milestones End of sep 2003: 2-channels card built. End of oct 2003: 4-channels card prototype built. Half of nov 2003: 4 x 4-channels cards with minicrate and power supply built and tested at PSI. End of nov 2003: test at PSI. PSI - 11 Feb Splitter in/out 4 splitter boards with: 4 inputs 50 impedance (PMT input) 4 x 2 outputs single-ended large bandwidth (DRS board and Monitor) 4 outputs differential reduced-bandwidth (Trigger) 1 adder sum of the 4 inputs (Trigger) in out diff out out adder PSI - 11 Feb Splitter Electrical Characteristics Based on Analog Device IC AD8009 and AD8138 Gain of x1 (modified to x10 at PSI) Integral non-linearity