EUDET, OCT8 - 10, 2007 Ivo Polak, IoP Prague1 A fast LED driver prototype for HCAL calibration EUDET annual meeting at Ecole Polytechnique, Palaisau.

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Presentation transcript:

EUDET, OCT8 - 10, 2007 Ivo Polak, IoP Prague1 A fast LED driver prototype for HCAL calibration EUDET annual meeting at Ecole Polytechnique, Palaisau

EUDET, OCT8 - 10, 2007 Ivo Polak, IoP Prague2 Proposal for calibration system New LED driver with reduced crosstalk 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 PIN photo diode, do we need them?

EUDET, OCT8 - 10, 2007 Ivo Polak, IoP Prague3 LED driver strategy 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)

EUDET, OCT8 - 10, 2007 Ivo Polak, IoP Prague4 Quasi-Resonant LED driver LC circuit, heavily dumped Simulation ~ 5ns puls width (slightly depends on the amplitude) 33nH PCB inductance, no ferromagnetic core Prototyping Used my lovely single side copper foil PCB We need more work on components optimization

EUDET, OCT8 - 10, 2007 Ivo Polak, IoP Prague5 QR LED driver Simulation oscilloscope

EUDET, OCT8 - 10, 2007 Ivo Polak, IoP Prague6 Simulation at 1.5V amplitude XSC1 : Upper trace - sync pulse Lower trace – voltage at LED hot end XSC2: Lower trace LED current

EUDET, OCT8 - 10, 2007 Ivo Polak, IoP Prague7 Simulation at 3V XSC1 : Upper trace - sync pulse Lower trace – voltage at LED hot end XSC2: Lower trace LED current

EUDET, OCT8 - 10, 2007 Ivo Polak, IoP Prague8 Prototype of QR LED driver

EUDET, OCT8 - 10, 2007 Ivo Polak, IoP Prague9 LED current waveform (GRN) a=3

EUDET, OCT8 - 10, 2007 Ivo Polak, IoP Prague10 LED current waveform (GRN) a=2

EUDET, OCT8 - 10, 2007 Ivo Polak, IoP Prague11 LED current waveform (GRN) a=1

EUDET, OCT8 - 10, 2007 Ivo Polak, IoP Prague12 Last tests, more power on LED We see response of PIN photodiode at oscilloscope Amplitude up to 50 Ω

EUDET, OCT8 - 10, 2007 Ivo Polak, IoP Prague13 Response to low amplitude LED current (cyan) 10Ohm) PIN response (yellow) LED anode (violet)

EUDET, OCT8 - 10, 2007 Ivo Polak, IoP Prague14 Response to middle amplitude

EUDET, OCT8 - 10, 2007 Ivo Polak, IoP Prague15 Response to high amplitude 200mA current at LED

EUDET, OCT8 - 10, 2007 Ivo Polak, IoP Prague16 Response to high amplitude The Light from LED was optically blocked to PIN.

EUDET, OCT8 - 10, 2007 Ivo Polak, IoP Prague17 Conclusion QR LED driver is very promising technique to reduce Electro-Magnetic-Interferences PCB of the two-channel QR LED driver is being designed now End of October - PCB will be assembled – ready for tests November – summary report to EUDET November – measurements of light transfer in side-emitting fibres