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A fast LED driver prototype for HCAL calibration

A fast LED driver prototype for HCAL calibration. CALICE meeting at ANL, USA. Proposal for calibration system. Fast LED driver is a key part of calibration system A tunable calibration light in the range 0 to 100MIP

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A fast LED driver prototype for HCAL calibration

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  1. A fast LED driver prototype for HCAL calibration CALICE meeting at ANL, USA Ivo Polak, IPASCR, Prague

  2. Proposal for calibration system • Fast LED driver is a key part of calibration system • A tunable calibration light in the range 0 to 100MIP • Simplification of the optical system: one LED -> one side emitting fibre, one row of scintillator tiles • See Jara’s talk Comments on optical system II Ivo Polak, IoP Prague

  3. LED driver strategy not only for SiPM calibration • At AHCAL prototype (uses SiPM), we used CMB, calibration system with UV-LED 400nm driven by very fast rectangular pulses (1ns rise/fall time). • Steep Rectangular waveform satisfied the needs to vary pulse-width, BUT creates lots of harmonics  electromagnetic crosstalk! • We have found fixed pulse-width to about 6ns, we can go to use narrow band ->smooth waveform ≈ less RF interference = Quasi Resonant LED driver (single pulse) Ivo Polak, IoP Prague

  4. 2CH board primary tested With printed Cu inductor 2ns pulse-width Prototyping Used my lovely single side copper foil PCB We need more work on components optimization to recent LED Quasi-Resonant LED driverLC circuit, heavily dumped • Simulation pulse-width 5ns with 33nH inductance Ivo Polak, IoP Prague

  5. 2CH QRLED board Consists of: Double sided PCB 2 QRLED driver 2PIN photodiode preamp Rate generator 1Hz to 10kHz Voltage regulators Amplitude control V-calib and T-calib interface Ivo Polak, IoP Prague

  6. 2CH QRLED board There is a detail of two QRLED driver Printed inductors with taps, left is connected by tin joint Two trimmers equalize delays between CH A and B Ivo Polak, IoP Prague

  7. Principal schema of QRLed driver A A Ivo Polak, IoP Prague

  8. PIN PD response to UVLED PIN LED current 1V => 1A Ivo Polak, IoP Prague

  9. PIN PD response to UVLED LED current 1V => 1A PIN Ivo Polak, IoP Prague

  10. PIN PD response to UVLED LED current 1V => 1A PIN Ivo Polak, IoP Prague

  11. Ivo Polak, IoP Prague

  12. Further increase of the LED amplitude We see a change of the shape PIN 1mV/div LED current 1V => 1A Ivo Polak, IoP Prague

  13. Further increase of the LED amplitude We see a change of the shape PIN2mV/div LED current 1V => 1A Ivo Polak, IoP Prague

  14. Maximum amplitude of the LED We see a change of the shape PIN2mV/div LED current 1V => 1A Ivo Polak, IoP Prague

  15. In wider time scale,increase of the amplitude PIN 2mV/div Ivo Polak, IoP Prague

  16. In wider time scale PIN Ivo Polak, IoP Prague

  17. In wider time scale PIN Ivo Polak, IoP Prague

  18. Highest amplitude -> funny distortion PIN At this amplitude LED is shining visible  LED current 1V => 1A Ivo Polak, IoP Prague

  19. A response to Slower PMTLED is over full power PMT LED voltage at cathode sync Ivo Polak, IoP Prague

  20. PIN crosstalk test PIN Reference amplitude LED current 1V => 1A Ivo Polak, IoP Prague

  21. Optically shielded, same LED amplitude Electrical crosstalk to PIN NO crosstalk Ivo Polak, IoP Prague

  22. Different LEDs • More different LEDs will be tested • “PPT UVLEDs” 400nm are very fast! • One blue pioneer has been tested • Each type of the LED needs a bit of matching of 2 components at QRled driver Ivo Polak, IoP Prague

  23. Another Blue LED, too slow! 2ns -> 10ns PIN LED current 1V => 1A Ivo Polak, IoP Prague

  24. Another Blue LED, too slow! 2ns -> 20ns Electrical optical PIN LED current 1V => 1A Ivo Polak, IoP Prague

  25. Conclusion • QR LED driver is very promising technique to reduce Electro-Magnetic-Interferences • 2 PCBs of the two-channel QR LED driver are ready to further test • March – linearity test • April – more assembled PCBs to test • May – designing of multichannel system with light transfer in side-emitting fibers, first approach to mechanical integration to a new detector design Ivo Polak, IoP Prague

  26. Backup slides Ivo Polak, IoP Prague

  27. QR LED driver Simulation oscilloscope oscilloscope Ivo Polak, IoP Prague

  28. Simulation at 1.5V amplitude • XSC1: • Upper trace - sync pulse • Lower trace – voltage at LED hot end • XSC2: Lower trace LED current Ivo Polak, IoP Prague

  29. Simulation at 3V • XSC1: • Upper trace - sync pulse • Lower trace – voltage at LED hot end • XSC2: Lower trace LED current Ivo Polak, IoP Prague

  30. Tests shows more power on LED • We see response of PIN photodiode at oscilloscope • Amplitude up to 2mVpeak @ 50 Ω Ivo Polak, IoP Prague

  31. Prototype of QR LED driver Ivo Polak, IoP Prague

  32. Response to low amplitude at prototype • LED current (cyan) (voltage @ 10Ohm) • PIN response (yellow) • LED anode (violet) Ivo Polak, IoP Prague

  33. Response to middle amplitudeat prototype Pulse width ~ 6ns Ivo Polak, IoP Prague

  34. Response to high amplitude at prototype • 200mA current at LED Pulse width ~ 6ns Ivo Polak, IoP Prague

  35. Response to high amplitude at prototype • The Light from LED was optically blocked to PIN. Ivo Polak, IoP Prague

  36. LED Current View of the LED pulse for a small amplitude (0.6 A) Measured with 1GHz voltage differential probe and 1GHz scope TDS4104 at 1Ω smd resistor 4ns/div 0.5A/div Ivo Polak, IoP Prague

  37. LED current • View of the LED pulse for a middle amplitude (1.0 A) • Measured with 1GHz voltage differential probe and 1GHz scope TDS4104 at 1Ω smd resistor • 4ns/div 0.5A/div Ivo Polak, IoP Prague

  38. LED current • View of the LED current pulse for the highest amplitude (2.3 A) • Measured with 1GHz voltage differential probe and 1GHz scope TDS4104 at 1Ω smd resistor • 4ns/div 0.5A/div Ivo Polak, IoP Prague

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