Документ взят из кэша поисковой машины. Адрес оригинального документа : http://zebu.uoregon.edu/~uochep/talks/talks06/strom10-06.pdf Дата изменения: Thu Dec 7 23:35:34 2006 Дата индексирования: Tue Oct 2 11:28:13 2012 Кодировка: Поисковые слова: http astrokuban.info astrokuban

Up date on KPiXs
David Strom ­ University of Oregon

· Intro duction · Latest results · Plans

Si-W work ­ p ersonnel and resp onsibilities Y. Karyotakis V. Radeka B. Holbro ok R. Lander M. Tripathi J. Brau R. Frey D. Strom


M. Breidenbach D. Freytag, N. Graf G. Haller,R. Herbst T. Nelson SLAC Electronics Mechanics Simulation

Annecy Mechanics

BNL Electronics

UC-Davis Bump Bonding Cabling Mechanics

Oregon

Si Detectors Mechanics Simulation



This work includes contributions from Oregon students Mary Robinson and Asher 1
26 Octob er 2006 ­ David Strom ­ UO

Tubman.


Extremely Simplified Schematic
Bunch Clock/ ADC Counter 13 Reset Inhibit Store 4 x 13 bit memory

Cb Cs Shaper 1

+ T1 + T2 + T3 -

Range Select

C ~ 50pF d + Bias Shaper 2

Buffers + T4 4 x 13 bit memory

· KPiX can store up to four four pairs of analog charges and time stamps p er train · Low noise p erformance at output of shap er paramount · Digitization o ccurs during b etween trains · Novel scheme feedback scheme used to get 16 bit dynamic range (Cb = 25 в Cs ) · Range switching o ccurs at ab out 1V

2

26 Octob er 2006 ­ David Strom ­ UO


New Features on KPiX 3 · Improved Analog/Digital isolation · Polarity switching (not shown) · External trigger for test b eam use

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26 Octob er 2006 ­ David Strom ­ UO


Novel Feature works:
KPiX3 2006_10_19_12_19_37
Output ADC

500

400

300

200

100 100 200 300 Injected charge (fC) 400 500

Range switching level adjusted to o ccur at 200 fC rather than 400 fC for illustration. Shows whole chain works prop erly.
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26 Octob er 2006 ­ David Strom ­ UO


One can adjust the range threshold to measure the charge amp gain, or equivalently the size of its feedback capacitor
KPiX 3: 2006_10_16_12_45_14 - 2006_10_18_15_46_20
capdst
Entries Mean RMS Underflow Overflow 121 469.5 26.75 2 0

18 16 14 12 10 8 6 4 2 0 400 420 440 460 480 500 520 540

560 580 600 Capacitance (fF)

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26 Octob er 2006 ­ David Strom ­ UO


800

700

ID Entries Mean RMS 22.06 P1 P2 P3

600

200 4095 239.0 2.096 / 11 775.6 238.9 2.096

500

400

300

200

100

0

200

220

240

260

280

300

ADC counts

Typical noise in the ADC corresp onds to less than 1 fC.
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26 Octob er 2006 ­ David Strom ­ UO


Noise (fC)

8

7

Gaussian fit RMS

6

5

4

3

2

1

0

0

10

20

30

40

50 60 channel number

Some of the outliers are channels with extra connections.
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26 Octob er 2006 ­ David Strom ­ UO


Status · Still optimizing digital timing of control signals on chip (most things are adjustable). · Initial tests are done with many internal digital and some internal analog signals brought out for testing · This allows the design of the chip to b e verified, but interferes with low noise testing Have not yet verified exp ected low noise p erformance for small signals

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26 Octob er 2006 ­ David Strom ­ UO


Fabrication Plans Submit KPiX4 so on (Nov 15?): · Improved shap er · Better current sources for ADCs · Nearest neighb or logic for tracking · Improved analog/digital buffering. Allows for much lower digital voltage. Move to KPiX 1024 when op eration of KPiX4 is demonstrated. May require KPiX5.

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26 Octob er 2006 ­ David Strom ­ UO