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PADI Test @ Tsinghua

PADI Test @ Tsinghua. Jingbo Wang for Zhi Deng April, 2010. Test Setup. Oscilloscope (DPO7104 with P6247 diff. probe, 1GHz B.W.). 20dB Attenuator (DC-2GHz). Pulser (AFG3102). FEET Board with 2 PADI chips. Digital Output. Analog Output. ~28mV. ~250mV. Gain Estimation.

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PADI Test @ Tsinghua

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  1. PADI Test @ Tsinghua Jingbo Wang for Zhi Deng April, 2010

  2. Test Setup Oscilloscope (DPO7104 with P6247 diff. probe, 1GHz B.W.) 20dB Attenuator (DC-2GHz) Pulser (AFG3102) FEET Board with 2 PADI chips

  3. Digital Output Analog Output ~28mV ~250mV

  4. Gain Estimation • Assuming 5ns rise time with 1-order RC response of the test voltage pulse tr= 5ns Input current with 1V 5ns-rise time step signal 1V I in ~1pF 50ohm Gain = 277mV/mA Just a rough estimation, sensitive to the coupling capacitor, signal rise time

  5. Spikes Without discriminator fired With discriminator fired

  6. Averaged picture Without discriminator fired With discriminator fired Caused by logic transition?

  7. Output width vs. Input current

  8. Test with MRPC Digital output Analog output Telescope PMT coni. output

  9. Output from FEE of STAR TOFr Digital output Analog output Telescope PMT coni. output

  10. PADI jitter Test

  11. Test setup Diff. probe PADI CH1 CH1 CH2 CH2 TTL AUX (trigger) Signal Generator Oscilloscope

  12. Signal Generator Only CH2 CH1

  13. With PADI CH2 CH1

  14. Test Results

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