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Charge Measurement Using Commercial Devices

Charge Measurement Using Commercial Devices. Jinyuan Wu, Zonghan Shi For CKM Collaboration. Jan. 2003. Introduction. FPGA. Q. Integrator. AD6644. PMT. HP1662C. The Circuit Board. AD6644. To Analyzer. Integrator (2) OPA660. Input Pulse. Integrator(1) AD8055. FPGA. EPC2LC20.

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Charge Measurement Using Commercial Devices

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  1. Charge Measurement Using Commercial Devices Jinyuan Wu, Zonghan Shi For CKM Collaboration. Jan. 2003

  2. Introduction FPGA Q Integrator AD6644 PMT HP1662C

  3. The Circuit Board AD6644 To Analyzer Integrator (2) OPA660 Input Pulse Integrator(1) AD8055 FPGA EPC2LC20 Optical receiver SLC-25-4 Transceiver TLK1501

  4. All test equipments

  5. Outline • AD6644. • Integrator circuit (1). • ADC output. • Optical Transmission. • Integrator circuit (2).

  6. Commercial ADC: AD6644 • The AD6644 is a high speed, high-performance, monolithic 14-bit analog-to-digital converter. • The guaranteed sample rate is 65 MSPS. • The sample rate in our tests is 35 MHz or • the sample time is 28.5ns. • Current FPGA technology is used in our • tests.

  7. Integrator for ADC [1] 100pf 36.5k _ Input Pulse OUTPUT 51 AD8055 + GND +2.5V • It is a traditional integrator. • T=RC=36.5k x 100pf=3.65us=128 x 28.5ns • The output will send to AD6644 as a input signal.

  8. InputPulse Output

  9. Input Pulse Output

  10. Digital Process of AD6644 Output ADC ADCQ = Charge D • Using FPGA hardware to find charge. D DIFF ABS SUB AND Higher Bits OR Simple Zero Suppression Algorithm

  11. Data from HP 1662C Logic Analyzer ADCQ DIFF =Charge

  12. ADCQ

  13. Charge

  14. D The Stability of AD6644 D(DATAFROM AD6644) S SUB ABS D R(RESULT) EN 256 • DC input is sent to AD6644. • Above circuit is used to produce the mean of absolute difference.

  15. Data From HP 1662C Logic Analyzer Result ADCQ

  16. The Mean of Absolute Difference

  17. ADC Output of DC Input ADCQ

  18. Standard Deviation

  19. Optical Transmission • The ADC test board has same interface as the QIE test board. • Data have been successfully transmitted to Lab 6 station. • A simpler test station is being built at WH14W.

  20. DATA PROCESS BY USING DATA FROM LAB_6

  21. 100pf 5V Integrator for ADC [2] 36.5k 8 OUTPUT 150 3 Input Pulse OPA660 51 2 Operational Amplifier & Buffer GND 17 GND 150 5 6 +1 Similar as Ken Nelson’s design except the omission of the reset circuits. 51 GND

  22. Input Pulse Output

  23. Input Pulse Output

  24. Thanks END

  25. Input Pulse Output Integrator (1)

  26. Input pulse Output Integrator (2)

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