A fast LED driver prototype for HCAL calibration

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Presentation transcript:

A fast LED driver prototype for HCAL calibration CALICE meeting Prague CALICE, SEP13, 2007 Ivo Polak, IoP Prague

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? CALICE, SEP13, 2007 Ivo Polak, IoP Prague

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 a lots of harmonics and then it converts to 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) CALICE, SEP13, 2007 Ivo Polak, IoP Prague

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 needs more work to components optimisation CALICE, SEP13, 2007 Ivo Polak, IoP Prague

QR LED driver Simulation CALICE, SEP13, 2007 Ivo Polak, IoP Prague

Simulation at 1.5V amplitude XSC1: Upper trace - sync pulse Lower trace – voltage at LED hot end XSC2: Lower trace LED current CALICE, SEP13, 2007 Ivo Polak, IoP Prague

Simulation at 3V XSC1: XSC2: Lower trace LED current Upper trace - sync pulse Lower trace – voltage at LED hot end XSC2: Lower trace LED current CALICE, SEP13, 2007 Ivo Polak, IoP Prague

Prototype of QR LED driver CALICE, SEP13, 2007 Ivo Polak, IoP Prague

LED current waveform (GRN) a=3 CALICE, SEP13, 2007 Ivo Polak, IoP Prague

LED current waveform (GRN) a=2 CALICE, SEP13, 2007 Ivo Polak, IoP Prague

LED current waveform (GRN) a=1 CALICE, SEP13, 2007 Ivo Polak, IoP Prague

Conclusion QR LED driver is very promising technique to reduce Electro-Magnetic-Interferences During September we plan to have a single channel protoboard for lab tests with PIN-photodiodes In October two-channel QR LED driver on PCB ready to measure light transfer in side-emitting fibres CALICE, SEP13, 2007 Ivo Polak, IoP Prague