1. 15. CBM Collaboration Meeting, GSI, Darmstadt, April 12–16, 2010 Status of Front End Electronics N-XYTER PCBs & Power Supply Volker Kleipa, GSI Darmstadt

2. 15. CBM Collaboration Meeting, GSI, Darmstadt, April 12–16, 2010 Topics NYXTER FEB_D N-XYTER FEB_D PCB FEB_B,C,D N-XYTER cooling NYXTER Demonstrator DC power supplies test in high magnetic fields Multiphase DC/DC converter step down Piezo 2KV generator Status

3. 15. CBM Collaboration Meeting, GSI, Darmstadt, April 12–16, 2010 N-XYTER FEB_D PCB Changed/added in rel. to FEB_C: Increased NXYTER bond pitch 0.3V drop LDOs used Separated supply regulators PT100 sensor out Alternative connector for separated LVDs and common mode signals Testpoints New power connector I2C and SPI spike filter I2C reads now: Temperature Current Testchannels Slow, Fast I2C RW: Serial EEprom for data storage

4. 15. CBM Collaboration Meeting, GSI, Darmstadt, April 12–16, 2010 N-XYTER PCB Cooling Plate Cooling Block for FEB_B, FEB_C and FEB_D Design by Carmen Simons

5. 15. CBM Collaboration Meeting, GSI, Darmstadt, April 12–16, 2010 N-XYTER Demonstrator Input pitch 100um PCB size 65mm x 80mm Cooling of 14W power with bottom copper or Al plate ADC device on bottom side Ext. power supply regulation Open task: Staggered NXYTER bonds to one layer input fan Data output connection

6. 15. CBM Collaboration Meeting, GSI, Darmstadt, April 12–16, 2010 Multiphase DC/DC converter step down test Target ist to develop power supply converters for high magnetic field environments. The used test design is a 2 Phase DC/DC step down converter TI TPS4031EVM Manufacturers spec.: Converter 12V to 3.3V, >82% eff. 30mVpp ripple @40A output 190kHz each phase Test preparation: 800nH coils are replaced by air coils Output set to 3.3V Load ~0.5 Ohm 1.6 Tesla environment

7. 15. CBM Collaboration Meeting, GSI, Darmstadt, April 12–16, 2010 DC/DC Converter Results Measured during test: Load 5.5A @ 2.4V out (2x5m cable to load) 0.6Vpp ripple / 380kHz 61% efficiency Ripple reduction by increasing phase frequency EM reduction with toroid air coil design and copper shield Spread spectrum clocking?

8. 15. CBM Collaboration Meeting, GSI, Darmstadt, April 12–16, 2010 Piezo 2KV generator test Target was to test a piezo-device in a high magnetic field environment. Design used is a PZT high voltage power supply PPT04P2020XB1/ MMech Manufacturers spec.: Max. 4W output Max. 2mA output >70% eff. Max 0.1% Vpp ripple Converter in 8-14V Analog adjustable 0..2KV Test preparation: A 30uH shielded coil was replaced by an air coil Output set to 1KV 1M Ohm load 1.6 Tesla environment

9. 15. CBM Collaboration Meeting, GSI, Darmstadt, April 12–16, 2010 2KV Piezogenerator test results Measured during test: 0.6% Vpp ripple @ 1KV / 1W output 66% efficiency Ripple reduction by: Air coil design An attenuation of noise spikes in magnetic field was detected. Output measured with 100:1 prescaler

10. 15. CBM Collaboration Meeting, GSI, Darmstadt, April 12–16, 2010 Status FEB-D PCB - Assembling ongoing Demonstrator - Finish of prototype when FEB-D manufacturing is fixed Power supply tests - Switching converters with more phases and optimized air coils - Step down piezoelectric-converters - Beam-Test with piezo-device

11. 15. CBM Collaboration Meeting, GSI, Darmstadt, April 12–16, 2010 Thanks for your attention