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A fast LED driver prototype for HCAL calibration HCAL meeting DESY HH HCAL HH, DEC19, 2007 Ivo Polak, IoP Prague 1 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? HCAL HH, DEC19, 2007 Ivo Polak, IoP Prague 2 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) HCAL HH, DEC19, 2007 Ivo Polak, IoP Prague 3 Quasi-Resonant LED driver LC circuit, heavily dumped •Simulation pulse-width 5ns with 33nH inductance • Prototyping • 2CH board • Used my lovely single side copper foil PCB • We need more work on components • optimization • primary tested • With printed indictor 2ns pulse-width HCAL HH, DEC19, 2007 Ivo Polak, IoP Prague 4 QR LED driver Simulation oscilloscope HCAL HH, DEC19, 2007 oscilloscope Ivo Polak, IoP Prague 5 Simulation at 1.5V amplitude • XSC1: • Upper trace - sync pulse • Lower trace – voltage at LED hot end • XSC2: Lower trace LED current HCAL HH, DEC19, 2007 Ivo Polak, IoP Prague 6 Simulation at 3V • XSC1: • Upper trace - sync pulse • Lower trace – voltage at LED hot end • XSC2: Lower trace LED current HCAL HH, DEC19, 2007 Ivo Polak, IoP Prague 7 Prototype of QR LED driver HCAL HH, DEC19, 2007 Ivo Polak, IoP Prague 8 Tests shows more power on LED • We see response of PIN photodiode at oscilloscope • Amplitude up to 2mVpeak @ 50 Ω HCAL HH, DEC19, 2007 Ivo Polak, IoP Prague 9 Response to low amplitude • LED current (cyan) (voltage @ 10Ohm) • PIN response (yellow) • LED anode (violet) HCAL HH, DEC19, 2007 Ivo Polak, IoP Prague 10 Response to middle amplitude HCAL HH, DEC19, 2007 Ivo Polak, IoP Prague 11 Response to high amplitude • 200mA current at LED HCAL HH, DEC19, 2007 Ivo Polak, IoP Prague 12 Response to high amplitude • The Light from LED was optically blocked to PIN. HCAL HH, DEC19, 2007 Ivo Polak, IoP Prague 13 2CH prototype Double sided PCB 2 QRLED driver 2PIN photodiode preamp Rate generator 1Hz to 10kHz Voltage regulators Amplitude control V-calib and T-calib interface HCAL HH, DEC19, 2007 Ivo Polak, IoP Prague 14 2CH QRLED board There is a detail of two QRLED driver Printed inductors with taps, left is connected by tin joint Two trimmers equivalise delays between CH A and B HCAL HH, DEC19, 2007 Ivo Polak, IoP Prague 15 Principal schema of QRLed driver A A HCAL HH, DEC19, 2007 Ivo Polak, IoP Prague 16 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 HCAL HH, DEC19, 2007 Ivo Polak, IoP Prague 17 LED current • View of the LED pulse for a middle amplitude (1.0 A) HCAL HH, DEC19, 2007 Ivo Polak, IoP Prague • Measured with 1GHz voltage differential probe and 1GHz scope TDS4104 at 1Ω smd resistor • 4ns/div 0.5A/div 18 LED current • View of the LED current pulse for the highest amplitude (2.3 A) HCAL HH, DEC19, 2007 Ivo Polak, IoP Prague • Measured with 1GHz voltage differential probe and 1GHz scope TDS4104 at 1Ω smd resistor • 4ns/div 0.5A/div 19 Conclusion • QR LED driver is very promising technique to reduce Electro-Magnetic-Interferences • PCB of the two-channel QR LED driver is ready to further test • January - more test with Photodetectors • February – more assembled PCBs available • May – designing of multichannel system with light transfer in side-emitting fibres, mechanical integration to a new detector design HCAL HH, DEC19, 2007 Ivo Polak, IoP Prague 20