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Recent progress

Recent progress. Jamie 29 th Feb 08. Shapers Samplers. -source. +source. What we got. Shapers Samplers. -source. +source. What we expect. (sat limit means thresholds cannot be set above this value; capped). Shapers Samplers. What if?. -source.

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Recent progress

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  1. Recent progress Jamie 29th Feb 08

  2. Shapers Samplers -source +source • What we got

  3. Shapers Samplers -source +source • What we expect

  4. (sat limit means thresholds cannot be set above this value; capped) Shapers Samplers • What if? -source +source

  5. Manual Threshold Scan To check there are no ill-effects from driving the threshold directly with the DACs, some PCB pins were lifted and the global VTH lines driven from a power supply. (The number of hits was estimated from the typical time between ORE2 and ORE3 observed on the logic analyser) Sensor 16 (5um epi + DPW) DAC pins were re-attached and an automated scan performed for comparison

  6. Threshold Behaviour Test command: { diodeDrive 20 10 5 2600 2563 } injects a signal into the test pixel that gives a ~210mV step response, ie similar to Fe55 peak. The threshold is scanned (manually) and the output of the comparator observed with respect to the input: The value of (signal-reset) is plotted when the comparator fires. Doesn’t show the upper range of the threshold, just how it detects a “Fe55-like” signal

  7. Threshold Behaviour Test command: { diodeDrive 20 10 5 2600 2563 } injects a signal into the test pixel that gives a ~210mV step response, ie similar to Fe55 peak. The threshold is scanned (manually) and the output of the comparator observed (by eye) on the oscilloscope: An estimate is made of the correct operation of the comparator (a value >0% and <100% indicates noise on the comparator output)

  8. Threshold Common-Mode 097 = 2048 099 = 3584 101 = 3072 108 = 2560 106 = 2048 110 = 1536 112 = 1024

  9. Some different masks 106 = all active 105 = alt rows masked 114 = alt cols masked 113 = no neighbours Renato’s Gaussian fits

  10. Jumper options • J23: Substrate • GNDA (analog, default) • GNDD (digital) • NONE (floating) • J24: VRST • VDDA1V8pix (default) • DAC • Au BASE PLATE • Floating • Grounded (2-3) GNDD (1-2) GNDA (2-3) VDAC (1-2) VDDA

  11. Substrate connection J23 • 150 • 151 GNDD • 152 • 153 • 154 GNDA • 155 • 156 • NONE • 158

  12. Vrst connection J24 134 135 VDDA 142 138 140 VDAC

  13. Base plate grounding 134 135 FLOAT 142 153 154 GNDED 155

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