Belle II Pixel Detector Jakob Haidl , Christian Koffmane, Felix - - PowerPoint PPT Presentation

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Belle II Pixel Detector Jakob Haidl , Christian Koffmane, Felix - - PowerPoint PPT Presentation

Nov 09, 2022 469 likes •759 views

Testing of Readout Electronics for Belle II Pixel Detector Jakob Haidl , Christian Koffmane, Felix Mller, Martin Ritter, Manfred Valentan Jakob Haidl 1 Pixel Detector Belle II Occupancy of detector ~1% Spatial Resolution

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1

Jakob Haidl

Testing of Readout Electronics for Belle II Pixel Detector

Jakob Haidl, Christian Koffmane, Felix Müller, Martin Ritter, Manfred Valentan

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Jakob Haidl

Pixel Detector – Belle II

  • Two Layers of DEPFET

Pixels

  • Distance from IP: 14mm,

22mm

  • 40 half ladders
  • Pixel size (50x55µm² and

50x85µm²)

  • Occupancy of detector

~1%

  • Spatial Resolution

~15µm

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Jakob Haidl

Electrical Multi Chip Module – EMCM

Fully functional half ladder without DEPFET Test

  • Technological feasibility
  • Probing of Signals & Voltages
  • Electrical Performance
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Jakob Haidl

Electrical Multi Chip Module – EMCM

4 x DCD Drain Current Digitizer

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Jakob Haidl

Electrical Multi Chip Module – EMCM

4 x DHP Data Handling Processor 4 x DCD Drain Current Digitizer

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Jakob Haidl

Electrical Multi Chip Module – EMCM

4 x DHP Data Handling Processor 4 x DCD Drain Current Digitizer 6 x Switcher

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Jakob Haidl

Electrical Multi Chip Module – EMCM

4 x DHP Data Handling Processor 4 x DCD Drain Current Digitizer Space for Matrix Test Structures 6 x Switcher

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Jakob Haidl

Electrical Multi Chip Module – EMCM

4 x DHP Data Handling Processor 4 x DCD Drain Current Digitizer Space for Matrix Test Structures 6 x Switcher Kapton Flex Cable

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Jakob Haidl

EMCM Periphery

Aluminum Jig Kapton EMCM Power Patch Panel Data Patch Panel Cooling

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Jakob Haidl

Drain Current Digitizer – DCD

  • Receives and

digitizes DEPFET currents

  • 256 analogue input

channels

  • 8 digital output

buses (32 channels multiplexed to 1 bus)

  • Bump bonded

(soldered)

  • 3240µm x 4969µm

Two cyclic Analog Digital Converter (ADC) for each channel

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Jakob Haidl

Calibration of ADCs

External Current Source

  • linear
  • low noise
  • fast
  • 248µA in 65000 steps
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Jakob Haidl

ADC Transfer Curves

Number of working channels Noise integral nonlinearity Differential nonlinearity Dynamic range depending on gain Adjust Settings of ADC Data Transmission Input current Digital Value (8 bit)

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Jakob Haidl

Dynamic Range for Gain Settings

𝐻~ 𝑆𝑔 𝑆𝑡

Rf Rs Gain 30kΩ 30kΩ 1 30kΩ 15kΩ 2h 60kΩ 30kΩ 2l 60kΩ 15kΩ 4

ΔI=33.2µA ΔI=20.9µA ΔI=22µA ΔI=14.4µA

Rf Rs Gain 4 Gain 1 Gain 2l Gain 2h

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Jakob Haidl

2 Bit Offset Compensation

Channels Input Current Dynamic Range Goal

  • Reduce the spread of

input currents

  • Fit into dynamic range of

ADCs

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Jakob Haidl

2 Bit Offset Compensation

add:

  • 0 x IPDAC
  • 1 x IPDAC
  • 2 x IPDAC
  • 3 x IPDAC

Channels Input Current Dynamic Range 3 x 1 x 2 x 1 x 0 x 0 x Reduction of Pedestal Spread

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Jakob Haidl

2 Bit Offset Compensation

Channels Input Current Dynamic Range Global current subtraction to reach the dynamic range

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Jakob Haidl

Data Transmission – DCD to DHP

8 Data Buses

  • 32 channels multiplexed to 1

data bus

  • 8 data buses for 256 channels

8 Transfer Lines per Data Bus

  • each data line has 8 bit
  • 64 transfer lines in total
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Jakob Haidl

Sampling Point

Local Delay

  • single channel
  • up to 15 delay elements

Global Delay

  • all channels
  • up to 15 delay elements

sampling point close to flank wrong readings occur

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Jakob Haidl

Sampling Point

Local Delay

  • single channel
  • up to 15 delay elements

Global Delay

  • all channels
  • up to 15 delay elements

sampling point close to flank wrong readings occur sampling at plateau correct reading

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Jakob Haidl

Delay Space

Dark Blue: correct transmission Local Delays Global Delays

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Jakob Haidl

Data Transmission – DHP to DHH

15m

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Jakob Haidl

Data Transmission – DHP to DHH

A B C

  • A: Signal Amplitude
  • B: Overshot Amplitude
  • C: Overshot Width
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Jakob Haidl

Data Transmission – DHP to DHH

A B C = 0 A B C

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Jakob Haidl

Data Transmission – DHP to DHH

A B C = 1 A B C

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Jakob Haidl

Data Transmission – DHP to DHH

A B C = 2 A B C

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Jakob Haidl

Data Transmission – DHP to DHH

A B C = 3 A B C

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Jakob Haidl

Summary

  • EMCM – Half Ladder without DEPFET
  • ADC Transfer Curves

Dynamic Range for Gain Settings

2 Bit Offset Compensation

Data Transmission

ADC Settings

  • Outlook

Operation and characterization of a small test matrix on EMCM

Final modules will be tested and characterized starting from August