VAL K4-212 Hybrid
Setup
- Kapton4 Forward Hybrid (K4-212) populated with 12 ABCD3T.
- SEQUENCER - DRAFT readout.
- FWDKEL + SC2001.
No optical readout is used, we use the electrical lines.
Parameters
- Vdd = 4.00 V (on hybrid).
- Vcc = 3.50 V (on hybrid).
- Edge detection circuitry disabled.
- Compression mode Level (X1X).
- Bias Current = 220uA.
- Shaper Current = 31.2uA.
Noise Scan
A trimming was done at Qin=0.0fC (Noise Scan), using the 60mV range.
The Threshold value that minimizes the spread was 45 mV.
Using this trimming, a Noise Scan was done and no sign of instability was observed.
Common Mode
Using the trimming at 0fC and setting the threshold at 0fC, 100.000 events were analyzed.
HitsperEvent.ps shows the number of hits per event (over 1)
and the spread of this distribution.
The calculated Gamma gives 6% of Common Mode.
Plotting the Correlation Matrix (CorrelationFull.jpg)
one can observe a very low correlation (0.0003) for channels of different chip and a bit
more (0.028) for channels within the same chip (correlaciones.ps).
If one observes the correlation within one chip, it seems that channels with lower value (within the chip) have a little bit more correlation than channels with higher number. Chip number 4 is a clear example (corr4-4.eps).
Trimming
The trimming was done at Qin=1.0fC, using the 60mV range. The Threshold value that minimizes the
spread at 1.0fC is 85 mV.
Bad channels
- Dead channels: None.
- Hot channels: None.
- No trimmed channels: 309, 669, 1189.
Calibration
| Chip | M0 | S1 | S2
| S3 | S4 | E5 | Front
|
| Gain(mV/fC) | 48.4 | 50.2 | 48.9 | 49.9 | 50.4 | 49.3 | 49.5
|
| ENC(@2fC)(e-) | 571 | 615 | 681 | 664 | 603 | 615 | 625
|
| Chip | M8 | S9 | S10
| S11 | S12 | E13 | Back
|
| Gain(mV/fC) | 50.0 | 49.5 | 49.6 | 49.9 | 49.3 | 49.2 | 49.6
|
| ENC(@2fC)(e-) | 646 | 663 | 655 | 652 | 633 | 645 | 649
|
Plots:
Timewalk
| Chip | M0 | S1 | S2
| S3 | S4 | E5 | Front
|
| Timewalk(ns) | 9.52 | 9.52 | 9.52 | 9.52 | 9.52 | 9.52 | 9.52
|
| Chip | M8 | S9 | S10
| S11 | S12 | E13 | Back
|
| Timewalk(ns) | 9.52 | 9.52 | 9.52 | 9.52 | 9.52 | 9.52 | 9.52
|
Pulse Shape
A combined Strobe Delay - Threshold Scan was taken to reconstruct the pulse
shape at 2fC and 4fC.
VAL K4-212 Hybrid
Last Updated August 20, 2001.
(silicio@ific.uv.es)
© IFIC 2000
