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PADME Front-End Electronics

Detailed technical overview of the S12572 Hamamatsu front-end card, preamplifier scheme, shunt linear regulator, and Arm Controller development at LNF-INFN. Complete design specifications and layout for efficient operation in experimental setups.

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PADME Front-End Electronics

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  1. We will talk about • General architecture • Architecture front-end card • Preamplifier end differential driver • Shunt linear regulator • Front end specifications • Arm Controller • I2C control monitoring and driver • Powersupply and high primaryvoltage generator PADME Front-End Electronics Servizio elettronica LNF-INFN gennaio_2017 G. Corradi D. TagnaniS. Ceravolo

  2. General architecture Silicon Detectors large area S12572 Hamamatsu 10x10mm Servizio elettronica G. Corradi D.TagnaniS.Ceravolo

  3. Architecture front-end card Servizio elettronica G. Corradi D.TagnaniS.Ceravolo

  4. TechnicalDecription • 4 independent channels per board • Each channel is composed : • Programmable shunt regulator tecnology • Fixed gain preamplifier for 5, • Differential 100Ω output analog signal • Measurement of the current in the detector • Measurement the temperature of the detectors • Single supply voltage • Low power dissipation Servizio elettronica G. Corradi D.TagnaniS.Ceravolo

  5. Preamplifierscheme Transimpedance Preamplifier Balanced Driver differential Servizio elettronica G. Corradi D.TagnaniS.Ceravolo

  6. Preamplifierspecifications • Fix Gain =5 • Type of output differential =100Ω • Bandwidth =70MHz • Excellentstability with less Cin <500pF • Repetition rate of more >1MHz • Pulseresolutionbetterthan <10ns • Dynamics of the output signal =1V • Total noise with Cin 2pF equivalent =2nV/√Hz • Input protection =300mJ • Single powersupply =8V • Dissipatedpower for channel =35mW Servizio elettronica G. Corradi D.TagnaniS.Ceravolo

  7. Amplitude and phasebehavior Module and phase behavior Servizio elettronica G. Corradi D.TagnaniS.Ceravolo

  8. Shunt Linear Regulatorscheme Shunt regulator Source current Driver DAC_In Servizio elettronica G. Corradi D.TagnaniS.Ceravolo

  9. Shunt linear regulatorspecifications • Of projecttecnology =Method shunt • Adjustmentrange of out voltage =0 to 95V • Accurancywriting and readingvoltage =16 bit • Local feedback high stability =1/000 • CurrentProtection (adjustable) default =300uA • Thermal stabilitytheoretical =50ppm • Dissipatedpower Vin 100V =30mW • Rejection to the input voltage=60dB • Responseloadvariation =100us • Maximum input voltage =200V • Noise to the maximum load =2mVpp • Control digital I2C - 2wire =CLK & Data Servizio elettronica G. Corradi D.TagnaniS.Ceravolo

  10. View multi-Layer PCB • 8 Layer PCB • Isolateddissipation area to gndpower by means of bridge resistors • Thermal control through PCB plans (to rememberthatwe are in vacuum) • Theoreticalvalue of the maximum powerdissipation, per board, 4 on the channels 400mW Servizio elettronica G. Corradi D.TagnaniS.Ceravolo

  11. Layout card front-end Layer Top Layer Bottom Servizio elettronica G. Corradi D.TagnaniS.Ceravolo

  12. Arm Controller • Standard Nim realization • Inner Arm CPU Cortex3 • Protocol Ethernet • USB portonly for diagnostic • 16 I2C control lines with peripheralbuffer • Powerdistribution to the front end • High voltage generator integratedprimary • Integrated control panel in the firmware • IMPORTANTLY. The Controller card hasonlybeendeveloped for testing, laterwill be integratedinto a definitive system Servizio elettronica G. Corradi D.TagnaniS.Ceravolo

  13. Controller Arm general scheme Servizio elettronica G. Corradi D.Tagnani S. Ceravolo

  14. Controller connections • Lemo00 analogsignaloutputs • Ethernet connection and USB • Led signalingpowersupply • Output connection I2C • Analogsignalinputs Servizio elettronica G. Corradi D.Tagnani S. Ceravolo

  15. Layout Controller Arm Servizio elettronica G. Corradi D.Tagnani S. Ceravolo

  16. Viewarm controller card Servizio elettronica G. Corradi D.Tagnani S. Ceravolo

  17. Conclusion • Front-end design card is complete • Wehave 5 boardsmounted to be tested in 5 days • Wehave to assemble 5 cables • Controller design and PCB completed • Wewillhave a prototypenext week • The firmware will be ready for the third week of february Servizio elettronica G. Corradi D.Tagnani S. Ceravolo

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