DES Collaboration Meeting, Chicago, December 11-13, 2006 T. Shaw1 DES Collaboration Meeting Front...

DES Collaboration Meeting, Chicago, December 11-13, 2006 T. Shaw

1

DES Collaboration Meeting

Front End Electronics StatusT. Shaw, D. Huffman, M. Kozlovsky, J. Olsen, W. Stuermer (FNAL)

T. Moore, V. Simaitis (UIUC)

M. Barceló, L. Cardiel (IFAE)

J. Castilla, J. DeVicente, G. Martinez (CIEMAT)

P. Moore, R. Schmidt (NOAO)


2

DES FE Project Definition

We must read out a large focal plane of CCDs

62 Science CCDs

8 Alignment CCDs

4 Guide CCDs

The Science and Alignment CCDs are read out at the same rate with the same clocking patterns

250k-pixels/s @ 10e- rms noise

The Guide CCDs will be readout at a faster rate; will not interfere with required “quiet” time of Science and Alignment CCDs


3

Monsoon Readout System is the chosen platform for test and production electronics

Monsoon– Developed by NOAO

– Crate based system (Eurocard format)

– cPCI backplane used (no cPCI protocol)

– Open Design• Schematics available• Firmware available• Layout files available

– Boards exist• Master Control Board• Clock and Bias Board• 8 Channel Acquisition Board

– Large software framework exists

http://www.noao.edu/ets/monsoon/





4

Monsoon Crate

MCBCBB8-ChCCDAcq.


5

History of Monsoon at FNAL

Mid 2004DES group looks into the Leach and Monsoon Systems as possible readout

solutions. Leach is an established proprietary readout system for CCDs. Monsoon offered some advantages – higher density (8 channel card vs 2 channel card of Leach); telemetry readout (readback of clock rail voltages and bias voltages); designed for large mosaics; open architecture; easy to customize. (Lots of manpower already expended by NOAO on Monsoon ~12 engineering years/~5 programmer years/~5 board layout years.)

University of Illinois Urbana-Champaign began to purchase the initial Monsoon test stands.

March 2005FE workshop at FNAL; decision to continue to pursue Monsoon as readout platform.

April 2005 Receive MCB, CBB and a blank prototype 8 ch CCD Acq Board to be hand

assembled.Never able to achieve low noise.

Nov 2005Delivery of 2 complete Monsoon systems (MCB, CBB and production 8 ch CCD Acq

Board).Fairly quickly began running with <10e- noise at ~12us/pixel.


6

History of Monsoon at FNAL

Feb 2006Delivery of two additional complete Monsoon Systems. One was shipped to

Barcelona

Mar 2006With “short” cable run, we are able to achieve ~6.5e- noise at ~6us/pixel

April 2006 With a pre-amp located outside of dewar wall, we are able to achieve ~6.5e- noise at

~6us/pixel with a long cable

July 2006Delivery of fourth Monsoon system for FNAL

August 2006FNAL Director’s review recommends use of JFET source follower close to CCD

video output

October 2006Begin instrumenting the Multi-CCD test Dewar (MCD)

December 2006Simultaneous readout of two CCDs in MCD.


7

Proposed Changes to Monsoon

• To use the Monsoon System for Production DES Electronics, we will customize the boards for our specific application:– Build a 12 channel CCD Acq Module which would provide

customized bias voltages, RTD readout, and Vsubstrate ramp control.

– Build a customized Clock Board to better address our clocking needs; greater fanout ability to drive more clocks.

– Slight modification to the Master Control Board to allow for switch to S-Link as the fiber optic link; also, look into multi-crate synchronization


8

12-Channel BoardWhy do we need to change the Monsoon Acquisition Board?

• System density– Limited space in proximity to the telescope. Increasing the

Video Channel count to 12 to better match the system.

• Improved Control of CCD Biasing.– Better trimming of HV Biases– Control of Substrate voltage rise/fall time (Ramp).

• Adding Temperature read back for RTD sensors.


9

CCD Acquisition Card Description

• 12 Video Signal Channels AC Coupled 18-bit ADC (same as Monsoon!) – Dynamic range and Sensitivity 4V pk/pk 15.6uV/ADC– Dual Slope Correlated Double Sampling (CDS) with DC Restoration– Offset controlled to maximize dynamic range– Maximum 250 kpixel/sec– Noise <3 ADU rms

• 48 High Voltage Biasing Signals (Telemetry)– 12 bit DAC adjustable between fixed range.– 12 bit ADC read back on each Bias channel– Outputs can be Enabled/Disabled via software control

• Micro-Sequencer Pattern Memory– Drives the Analog Front End circuits when triggered across the Back Plane.

• On-Board Temperature Sensor (10 bits)• 6 Channels for RTD temperature sensors on CCD

– 12 bit ADC with Sensor Current Source• Single FPGA for control: JTAG programmable• Board Identification

– Unique Digital Serial Number– Firmware Version– Board Type


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CCD 12 Channel Acq. Board

Temp.Sensor

DigitalSerial

Number

ResetInterface

6 ChanRTD

12 bit ADCTelemetryInterface

X48

12 bit DACInterface

X48

18 bit ADCInterface

X12

CDSInterface

X12

Back Plane

RAMMemory

-Sequencer

FPGA

900 pinBGA

JTAG Prog.

Transition Card (12 Video Channel Inputs)


11

Top View


12

Bottom View


13

12-Channel Transition Module


14

DES New Clock Board

• New Clock Board is being designed by engineers at CIEMAT (Madrid) which will drive many more clock lines.

• The current NOAO board provides 32 clocks, the new board will provide 135, or enough for 9 CCDs.


15

9 CCDs

CB-36 clk

Backplane

MAIN board

Transition

CRATE

135 clk

VIDEO Board

VIDEO Board

VIDEO Board

DES Clock Board Concept

CCD 3X15 CLKCCD CCD

CCD CCD CCD

CCD CCD CCD

3X15 CLK

3X15 CLK

9 CCDs

CCD 3X15 CLKCCD CCD

CCD CCD CCD

CCD CCD CCD

3X15 CLK

3X15 CLK

CB-36 clkTransition

135 clk


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FPGA

36 CLKVoltage swing generation

135 Cable Drivers

Hardware redesign

MONSOON CBB DES CB

sup

ply

Te

lem

etr

y

32 CLK

BIAS CPLD

CPLD

FPGA

• BIAS section removed• 4 clock generation channels added • 135 cable drivers included on board• 2 CPLD removed

su

pp

lyT

ele

me

try


17

Firmware redesign

• BIAS control removed• Code integration: from 2 CPLD+FPGA to 1 FPGA• New microsequencer development

microsequencer

SEQ BUS (write)

TELEMETRY

MUXFRONTPANEL

DAC/ADCCONFIG

ADCs

DACs

FRONTPANEL

36 Clocks

BackPlane

Interface

PATTERNMEMORY

(DUAL PORT)PROGRAMCOUNTER

GENERATION

CLOCKTRIGGERREGISTER

PIXDATA BUS (read)

FPGA


18

• Status:

– Schematics and layout ready

– Firmware ready for testing

– Prototype is under production

• Future work:

– CB testbench installation in Madrid (Monsoon based)

– Prototype validation and characterization

Clock board status


19

Barcelona work/Master Control Board

Waiting for Laia’s slides…

should cover s-link, multi-crate synchronization, transition cards


20

PF Packaging

UIUC has worked with FNAL mechanical engineers and proposes to instrument the telescope using three FE crates.

These crates would each contain two backplanes; one with 6 slots and one with 4 slots.

A single 4-slot section would provide for readout of up to 9 guide CCDs

The remaining backplane sections would provide readout of up to 72 science and alignment CCDs.

UIUC is also providing engineering support for crate power supplies.

MCB

CLOCK

CCD

Acq

CLOCK

CCD

Acq

CCD

Acq

MCB

CLOCK

CCD

Acq

CCD

Acq

Provides Readout of up to

18 CCDs

Provides Readout of up to

9 CCDs


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Vacuum Interface Board(VIB)

Vacuum Interface Board will provide the connection between the Monsoon boards and the CCDs on the focal plane.

Monsoon cables will plug into the VIB outside the vacuum.

Kapton cables will be used to connect between Vacuum Interface Board and the CCDs inside the dewar.


22

Vacuum Interface Board

Kapton Cable

AlN Board

Camera Vessel Instrumentation


23

Power Supply Studies

• Ongoing work by engineers at the University of Illinois on testing power supply performance.

• Goal is to prove viability of switching power supplies.• Tests were run with Linear supplies and Vicor supplies

attached to original Monsoon 6-slot DHE.• Remote sensing was removed & local sensing added.• Noise measurements are taken with video inputs connected to

ccd emulator


24

UofI Monsoon Test StandWiring Scheme


25

Linear Supply Plot Results


26

Vicor Supply Plot Results


27

Conclusions

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DES Collaboration Meeting, Chicago, December 11-13, 2006 T. Shaw1 DES Collaboration Meeting Front...

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