1. PADME Front-End Electronics
We will talk about
General architecture
Architecture front-end card
Preamplifier end differential driver
Shunt linear regulator
Front end specifications
Arm Controller
I2C control monitoring and driver
Power supply and high primary voltage generator
Servizio elettronica LNF-INFN gennaio_2017
G. Corradi D. Tagnani S. Ceravolo

2. G. Corradi D.Tagnani S.Ceravolo
General architecture
Silicon Detectors large area
S12572 Hamamatsu 10x10mm
Servizio elettronica
G. Corradi D.Tagnani S.Ceravolo

3. Architecture front-end card
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G. Corradi D.Tagnani S.Ceravolo

4. G. Corradi D.Tagnani S.Ceravolo
Technical Decription
4 independent channels per board
Each channel is composed :
Programmable shunt regulator tecnology
Fixed gain preamplifier for 5,
Differential 100Ω output analog signal
Measurement of the current in the detector
Measurement the temperature of the detectors
Single supply voltage
Low power dissipation
Servizio elettronica
G. Corradi D.Tagnani S.Ceravolo

5. Preamplifier scheme Transimpedance Preamplifier
Balanced Driver differential
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G. Corradi D.Tagnani S.Ceravolo

6. Preamplifier specifications
Fix Gain =5
Type of output differential =100Ω
Bandwidth =70MHz
Excellent stability with less Cin <500pF
Repetition rate of more >1MHz
Pulse resolution better than <10ns
Dynamics of the output signal =1V
Total noise with Cin 2pF equivalent =2nV/√Hz
Input protection =300mJ
Single power supply =8V
Dissipated power for channel =35mW
Servizio elettronica
G. Corradi D.Tagnani S.Ceravolo

7. Amplitude and phase behavior
Module and phase behavior
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G. Corradi D.Tagnani S.Ceravolo

8. Shunt Linear Regulator scheme
Shunt regulator
Source current
Driver
DAC_In
Servizio elettronica
G. Corradi D.Tagnani S.Ceravolo

9. Shunt linear regulator specifications
Of project tecnology =Method shunt
Adjustment range of out voltage =0 to 95V
Accurancy writing and reading voltage =16 bit
Local feedback high stability =1/000
Current Protection (adjustable) default =300uA
Thermal stability theoretical =50ppm
Dissipated power Vin 100V =30mW
Rejection to the input voltage =60dB
Response load variation =100us
Maximum input voltage =200V
Noise to the maximum load =2mVpp
Control digital I2C - 2wire =CLK & Data
Servizio elettronica
G. Corradi D.Tagnani S.Ceravolo

10. G. Corradi D.Tagnani S.Ceravolo
View multi-Layer PCB
8 Layer PCB
Isolated dissipation area to gnd power by means of bridge resistors
Thermal control through PCB plans (to remember that we are in vacuum)
Theoretical value of the maximum power dissipation, per board,
4 on the channels mW
Servizio elettronica
G. Corradi D.Tagnani S.Ceravolo

11. G. Corradi D.Tagnani S.Ceravolo
Layout card front-end
Layer Top
Layer Bottom
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G. Corradi D.Tagnani S.Ceravolo

12. G. Corradi D.Tagnani S.Ceravolo
Arm Controller
Standard Nim realization
Inner Arm CPU Cortex3
Protocol Ethernet
USB port only for diagnostic
16 I2C control lines with peripheral buffer
Power distribution to the front end
High voltage generator integrated primary
Integrated control panel in the firmware
IMPORTANTLY. The Controller card has only been developed for testing, later will be integrated into a definitive system
Servizio elettronica
G. Corradi D.Tagnani S.Ceravolo

13. Controller Arm general scheme
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G. Corradi D.Tagnani S. Ceravolo

14. Controller connections
Lemo00 analog signal outputs
Ethernet connection and USB
Led signaling power supply
Output connection I2C
Analog signal inputs
Servizio elettronica
G. Corradi D.Tagnani S. Ceravolo

15. G. Corradi D.Tagnani S. Ceravolo
Layout Controller Arm
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G. Corradi D.Tagnani S. Ceravolo

16. View arm controller card
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G. Corradi D.Tagnani S. Ceravolo

17. G. Corradi D.Tagnani S. Ceravolo
Conclusion
Front-end design card is complete
We have 5 boards mounted to be tested in 5 days
We have to assemble 5 cables
Controller design and PCB completed
We will have a prototype next week
The firmware will be ready for the third week of february
Servizio elettronica
G. Corradi D.Tagnani S. Ceravolo