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LED Current Source

LED Current Source. Design of the circuit to provide constant current supply to the LED Calibrate LED with reference to MIP signal value Expand the design to accommodate multiple LEDs connected concurrently. Differentiator /. Current Mirror. Pulse Generator. Amplifier. LED Current Source.

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LED Current Source

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  1. LED Current Source • Design of the circuit to provide constant current supply to the LED • Calibrate LED with reference to MIP signal value • Expand the design to accommodate multiple LEDs connected concurrently

  2. Differentiator/ Current Mirror Pulse Generator Amplifier LED Current Source One or more LEDs can be connected to the current mirror in the future

  3. LED Current Source • Pulse generator includes a fast switching logic clock (possibly a 5-5-5 timer) and logic gates • Output is a square pulse with amplitude of 2-3V (low-voltage logic for power conservation)

  4. LED Current Source • Differentiator/Amplifier will be designed using a 1Ghz fast Op-Amp • Gain factors will range from 0.1 to about 3-4 • Only positive (or negative) pulses will be used (controlled by a fast switching diode)

  5. LED Current Source • Current mirror will be designed using fast switching matched transistors • Current mirrors will be needed particularly in multi-LED design • Later on similar mirror will be used in the pre-amplifier design

  6. LED Current Source • LED will be calibrated using Hamamatsu PMT and APD, and possibly SiPM and MRS • We are looking into components • Low-power concern is due to a possibility of battery - powered operations for portability of the device (single - LED version only)

  7. LED Current Source • Tentative schedule: • Design and simulations by next Wednesday, also parts ordered by the end of the week • Prototype completed as parts become available • Calibrations being a subject to availability of the second test stand

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