Status of LAV FEE electronicsStatus of LAV FEE electronics

G. Corradi, C. Paglia, D. Tagnani

&

M. Raggi, T. Spadaro, P. Valente

Outline• General LAV readout Diagram• What we did in 2010

– ToT mezzanine design and production (final)– Sum analog board mezzanine (prototypes)– Low voltage regulators (prototypes)

• Planning for 2011– Mother board prototypes– Production– What we needs from outside LNF

General readout diagram LAV

TEL62

Front-end board (Diagram)Front-end board (Diagram)

Pre-amplifier stageDual thr. Discriminator & shaper

LVDS driver

CPU

Threshold control

Supply control± 6V± 12 V

CAN-Open

LVDS out

LVDS out

Analog sum out

Analog sum

Powersupply

Anal

og in

Test pulse

Trigger in

Final board

• 32 channels• VME 9U mechanics• Include services:

• Analog sums• Remote threshold• Individual channel threshold control• Pulsing system

DACADC

Hybrid Front-end board (July 2010)Hybrid Front-end board (July 2010)20 Prototype board

• VME 6U mechanics• 8 input channels• 16 output channels (8x2thr)• Manual threshold control local • 4 threshold by 4 channels

• 2 thr low• 2 thr high

• Sum of 4 analog outputs

4 Discriminator mezzanine boards for the final prototype

Sum for the final mezzanine board

Successfully tested during ANTI-A2 test beam October 2010 @CERN

ToT mezzanine (2 channel)ToT mezzanine (2 channel)

Analog sum outputAnalog sum output• One FEE boards serves 32 channels = 1 layer• 32 outputs cannot all be housed on the board:

(there isn’t place on the panel)• sum 4 block analog signals (e.g. one “banana”)• sum 4 bananas (16 channels = half a layer)• Output via Coax 50 , Lemo-00

sum 4sum 4

sum 4 Su

sum 16

16Ch

4Ch

4Ch 4Ch

4Ch

Analog sum board •Power consumptionV+ = +6V @ I+ = +12mAV- = -6V @ I- = -12mASums up to 4 input channels, range 0 to -2V Output signal can be inverted or non-inverted with respect to the input signalsBandwidht is 50MHz

Input signals

Output signals

Low Voltage Regulators

• Low Voltage regulators are used to generate +/-6V from +12/-12V LAV power rails

• An ultra compact, low noise buck converter, operating at 1.5MHz, generates +6V from +12V

• An innovative design has been used to create -6V from -12V, using a low noise switching converter, operating at 1.5MHz

Final LAV FEE board VME9UFinal LAV FEE board VME9UWe already have:-Mezzanine Boards (ToT discriminators)

-Sum Boards (1 “banana” or 4 blocks each)

- Sum Boards (16 blocks each)

- Power supply boards (+12 to +6V and -12 to -6V)

We will soon have:

Threshold circuitThreshold circuit

• Two different thresholds per channel• Remotely programmable (CAN-Open)

• 0-250 mV range• 12 bit resolution & 1 LSB stability performance

(standard low-cost components, more than enough)• Remotely readable via CAN-Open• Easy to implement automatic threshold tuning

• Local trimmer adjustment• 1 high and 1 low threshold for all channels

Front-end diagnosticsFront-end diagnostics• Provide a test pulse toward the PMT:

• Can be used to check connection up to the PMT• Operation modes

• free-running (controlled by local CPU)• or on external trigger (from TEL62) • pulse all channels• or a programmable pattern

• Signal characteristics• Squared waveform• 10 ns fixed width• 50 or 100 mV ”programmable amplitude in two steps”• Width and amplitude stability at 2% level

Front-end diagnostics

Widht = 10nsAmplitude = 100mV

R2 U1B

+5

-6

OUT7

R3

CABLE

R150R

PULSE OUT

U2B +5

-6

OUT7

C2

R7100R

ON_OFF CONTROL

PULSE IN

1

2

31

32

R6

SHAPER 10ns

Internal TriggerOscillator 100Hz

32ChannelsDecoder +Pulse Generator TELL62

LVDS OUT

PhotoMultiplier Tube

Pulse System

CPU

Int-Ext Trigger

VME9U

Int OscON-OFF

R4

R5

SPI

FEE LAV VME9U

Vth_H and Vth_L test points and adjust trimmers

CAN in, CAN out

USB

Rem

ote

Cont

rol

Loca

l Co

ntro

l

Sum 1 to 16Sums 1 to 4, 5 to 8,

9 to 12, 13 to 16

Sum 1 to 16Sums 1 to 4, 5 to 8,

9 to 12, 13 to 16

Sum 17 to 32Sums 17 to 20, 21 to 24,

25 to 28, 29 to 32

15

Wiener LAV crateWiener LAV crate

VoltagesModule

typeVoltage range

Channels per module

Peak output

Power

+12V MEH 7V to 16V 1 46A 550W

-12V MEH 7V to 16V 1 46 550W

+48V MEH30V to 60V

1 13.5A 650W

+3.3V digital

MDH 2V to 7V 2 +/-30A210W (420W

Total)

+5V digital   2V to 7V      

+5V analog

MDH 2V to 7V 2 +/-30A210W (420W

Total)

-5V analog   2V to 7V      

16

Roadmap to synchronization runRoadmap to synchronization run• April 2011 first production:

• 3 Full final FEE 9U board (without final firmware release)• 50 discriminator mezzanine boards• 30 sum mezzanine boards• 10 low voltage regulators• Integrated pulse diagnostic system

• April 2011 is last due date to have at LNF:• At least 1 LAV standard VME 9U crate• At least 1 TEL62+TTC• At least 4 TDCb (SCSI2 final vesion)

• July 2010 second bunch of FEE board production• End September 2011:

• We expect to have a working setup FEE-TEL62-PC

Conclusion

• Main component of LAV FEE board have been produced and tested– discriminator mezzanine designed and pre-produced – Analog sum boards designed and pre-produced– Low voltage regulators designed and pre-produced

• The requirement for the VME 9U crate have been established– ±12V 2A per slot required by LAV FEE

• Layout of the 9U motherboard is under design• First mass production of FEE components foreseen in 2011

– First 3 9U motherboard prototypes– Around half of discriminator and sum board mezzanine

• The remote control communication Firmware will be started