Upload
baldwin-rafe-york
View
231
Download
0
Embed Size (px)
DESCRIPTION
Rutherford Appleton Laboratory Particle Physics Department 3 SPPCB mm x 83 mm SSPPCB / mm x 9 mm Hybrid SSPPCB ABCD3TV2 Evolution of Serial Powering Circuitry SPPCB mm x 150mm AG Analog power AV DG Digital pwr DV DataCmd Clk
Citation preview
1
Rutherford Appleton LaboratoryParticle Physics Department
Serial Powering Scheme
Peter W PhillipsSTFC Rutherford Appleton Laboratory
On behalf of RAL group and collaborators
2
Rutherford Appleton LaboratoryParticle Physics Department
Motivations
• Fewer Cables• Fewer Connections• Increased Efficiency• Reduced Material
Concerns• noise/electrical
performance– In fact SP systems are
clean:• local regulation helps• chain current constant,
therefore no IR drops
• Failure in the chain – loss of many modules
• …
3
Rutherford Appleton LaboratoryParticle Physics Department
SPPCB - 2006 -111 mm x 83 mm
SSPPCB - 2006/7 -38 mm x 9 mm
Hybrid
SSPPCB
ABCD3TV2
Evolution of Serial Powering CircuitryEvolution of Serial Powering Circuitry
SPPCB - 2006 -150mm x 150mm
AG Analog power AV DG Digital pwr DVData Cmd Clk
4
1350
1400
1450
1500
1550
1600
755 663 159 628 662 006
Module #
<EN
C>
Independent powering Serial Powering
Noise vs injected noise frequency
600.00
610.00
620.00
630.00
640.00
650.00
660.00
1 MHz 5 MHz 10 MHz 30 MHz 40 MHz 50 MHz
Frequency
Out
put n
oise
(EN
C)
SP with current mod.
Voltage noise injection through capacitor
610.00
612.00
614.00
616.00
618.00
620.00
100 kHz 1MHz 10 MHz 30 MHz 40 MHz 50 MHz 70 MHz 120 MHz
Frequency
Noi
se E
NC
Tests with SCT modules or 4 chip hybrids
ENC of IP vs. SP
ENC with injection of external voltage pulse into power line ( 1V pp through 15 pF)
ENC with current modulation of 20 mA
SCT module test set-up
5
Rutherford Appleton LaboratoryParticle Physics Department
Interface PCB Cooling hoseswith connector
Module 0
Module 1
Hybrid 2
Module 3
Module 4
Module 5
Picture of the 6-module stave on a bonding fixture.
Module 2 is a bare hybrid without sensor for better comparison with single-hybrid data. The interface PCB at the end of the stave (top of the picture) carries a connector. All other stave electrical connections are made through wire-bonds. The cooling hoses (inlet and outlet) are at the top end of the stave.
6
Rutherford Appleton LaboratoryParticle Physics Department
HV from storage capacitors & LVDS power from bench supply
0
200
400
600
800
1000
1200
1400
1600
1800
2000
0 512 1024 1536 2048 2560 3072
Channel number
ENC
ENC 5
ENC 4
ENC 3
ENC 2
ENC 1
ENC 0
1000
1100
1200
1300
1400
1500
1600
1700
0 128 256 384 512
Channel number
ENC
ENC 5 av = 988.5
ENC 4 av = 1139.0
ENC 3 av = 1155.8
ENC 2 av = 618.3
ENC 1 av = 1156.1
ENC 0 av = 1185.9
30
35
40
45
50
55
60
65
70
0 512 1024 1536 2048 2560 3072
Channel number
GA
IN
GAIN 5
GAIN 4
GAIN 3
GAIN 2
GAIN 1
GAIN 0
30
35
40
45
50
55
60
65
70
0 128 256 384 512
Channel number
GA
IN
GAIN 5 av = 50.2
GAIN 4 av = 46.0
GAIN 3 av = 49.4
GAIN 2 av = 54.5
GAIN 1 av = 50.3
GAIN 0 av = 57.9
7
Rutherford Appleton LaboratoryParticle Physics Department
• Low output impedance crucial to achieve good ‘grounding’ and reduce picked up noise• Dynamically each sensor is grounded to current source
• Option of using single HV supply for several sensors
No difference in performance is seen with the 6 module stave
Single HV line Separate HV lines for each sensor
8
Rutherford Appleton LaboratoryParticle Physics Department
Module with 3cm detectorThree 6-chip hybrids operated as a serial chain
Next step: 30 module stave with commercial SP electronics
Data/clock/command Linear regulator ST SR AC-coupling
Work in Progress:Being built at LBNL
9
Rutherford Appleton LaboratoryParticle Physics Department
10 + 10 modules back-to-back 10 cm * 10cm sensors 40 ABC-Next chips/module Custom SP circuitry
Next Year: Short Strip “Supermodule”
10
Rutherford Appleton LaboratoryParticle Physics DepartmentSP Architecture Choices
a) External shunt regulator + external power transistor
External commercial SR+ ST, used for RAL studies with SCT modules.
With custom electronics could be part of one chip.
This is good engineering, but implies a high-current device; limited expertise in HEP IC community.
Constant current source
ROIC ROIC ROIC ROIC
Module 1
Module n
Voltage chain
5 V
2.5 V
0 V
We will test this with SPI chip
11
Rutherford Appleton LaboratoryParticle Physics Department
b) Shunt regulator + transistor in each ROIC
Integrated (custom) SR and transistor designed by Bonn worked well for pixels.
Many power supplies in parallel; Addresses high-current limitation and provides protection. Difficulty is matching and switch-on behaviour of shunt transistors. Must avoid hot spots that kill one shunt transistor after the other.
We will test this with ABC_Next (and SPi LVDS buffers)
SP Architecture Choices
12
Rutherford Appleton LaboratoryParticle Physics Department
c) External shunt regulator + integrated parallel power transistors
New attractive idea. Addresses high-current limitation. Conceptually simple. Need to understand how well distributed feed-back works.
Will test this with SPi (for Shunt Regulator and buffers) and ABC_Next (for Shunt Transistor)
SP Architecture Choices
13
Rutherford Appleton LaboratoryParticle Physics Department
Expected benefit of custom SP circuitry
Dynamic impedance: reduced by one or two orders of magnitude!
Measurement (G Villani): Prototype with commercial components
Simulation (M Newcomer): External Shunt Regulator and Integrated Shunt Transistors
14
Rutherford Appleton LaboratoryParticle Physics Department
• 30 module ABCD stave• Evaluation of custom circuitry
– ABC_Next and SPi• 20 module ABC-Next “Supermodule”
• Design protection schemes• G&S evaluation of SP systems
– important but not expected to be a concern• Design of constant-current source (Prague (JS) + RAL)
Hybrid
Outlook