CMS Upgrade WorkshopNovember 19-21

Fermilab

POWER DISTRIBUTION SYSTEM STUDIES FOR THE CMS TRACKER

Fermilab,University of Iowa and University of Mississippi

Marcos Turqueti(turqueti@fnal.gov)

Outline

• Report on the ongoing work at ESE/CD on Power Distribution for the CMS Tracker.

• Discuss possible improvements on the ongoing work.

• Summarize the objectives of ESE/CD on Power Distribution for the CMS Tracker.

• Discuss the current options available for the Upgrades.

What are the activities being carried out at ESE right now?

• DC-DC power distribution tests using the PSI46.

• Data over power utilizing the PSI46 readout chip as target.

• Simulation tools development for the CMS tracker power design.

DC-DC Power Distribution Tests

• Tests performed in using the CMS pixel readout chip, the test can be scaled from one to hundreds of ROCs.

• Compare performance comparison between the current power scheme and the DC-DC system using different parameters.

• Key performance parameters that will be checked; power line noise, communications integrity and ROC performance.

• Key DC-DC parameters that will be studied are: DC voltage level and data over power with different cable lengths.

• Key hardware pieces that will be tested; switching voltage regulators with different PCB embedded inductors, switching capacitor regulators, data-over power encoding circuit and PSI46 regulation circuit.

DC-DC Setup

1) CURRENT CMS LOW VOLTAGE DISTRIBUTION SYSTEM

2) PROPOSED DC-DC DISTRIBUTION SYSTEM

Personal Computer with CMS Power

distribution Software

Gigabit Ethernet

CAPTAN DAQ System

PSI46 CARD

PSI46 ANALOG OUT

PSI46 CONTROL

ENCODED PSI46 DATA (TDMA)

+POWER

TDMA ENCODER + DC-DC CONVERSION

20 xPSI46 ROCs

Test Setup at FNAL

20 xPSI46 ROCs

CAPTAN DAQ System

Gigabit Ethernet

PSI46 ANALOG OUT

PSI46 Control signalsSystem currently available.

3) EXPANDED DC-DC DISTRIBUTION TEST SYSTEM

X 24CAPTAN NODE

6 CARDS

ONE CAPTAN NODE WITH 6 DCB CARDS CAN SUPPORT 24 BOARDS, THIS TRANSLATES TO 480 ROCS PER NODE

The DC-DC/encoder board

EMBEDDED INDUCTORS MICRO

CARDS

TO CAPTAN CONNECTOR (SATA)

TO PSI46 ROCs BOARD- ANALOG (SATA)

TO PSI46 ROCs BOARD- DIGITAL

A3P250 FPGA

INDUCTOR BASED SWITCH STEP-DOWN

REGULATORS

LINEAR REGULATORS

ADC

JTAG

DC-DC STEP-DOWN BOARD

CAPACITOR SWITCH STEP-DOWN

REGULATORS

OR

EMBEDDED INDUCTORS MICRO CARDS

→ Ck ±→ Tki ±← Tko±→ Tr ±→ I2C ±→ R

◄ AOUT

TDMA -180MHZ

ADC_SAMPLETKOUT

01

V

LVDS (1.25)

I2c+reset TRG TK

20V

000001 1

t

V

TDMA - 180MHZLVDS (20.0)

How It Works

ADC, 105 Mbps

3.5

1.8V

2.5V2.5V

FPGA

SWITCHED REG BOARD

PSI ROC MODULE

Will be available in three weeks.

PINGA Software for CAPTAN Noise and Threshold Dispersion

• What are the Costs of a Given Design?• Material Budget• Power Dissipation/Efficiency• Reliability• Detector Performance Degradation

• How Does the System Evolve?• Failure Modes• Coupling Effects• Probabilities of Failures Change• Power and Performance Change

SIMULATION

• Possible Simulation Approach:

• Select a Power Distribution Design• Implement the Corresponding Model• Formulate a Cost Function• Integrate the System in Time to Get a Sample Sequence• Update the Cost Function in Time• Compute Average Cost for the Design

We are now gathering info on the current system, in particular the observed failure modes, its impact and frequency on the detector performance.

SIMULATION

• Complete Current Test System Development.

• Implement same Test System for Serial Powering Concept with PSI46 Modules. One possible implementation is using the Serial Power Interface Chip, see Marcel Trimpl presentation.

• Simulation Software Development.

Next Steps