status of front-end electronics for the opera target tracker
DESCRIPTION
O scillation P roject with E mulsion-t R acking A pparatus. Status of front-end electronics for the OPERA Target Tracker. LAL Orsay S.BONDIL, J. BOUCROT, J.E.CAMPAGNE, A.CAZES, C. de LA TAILLE, A. LUCOTTE, G. MARTIN-CHASSARD, L. RAUX, J.P. REPELLIN BERN University K.BORER, M.HESS. Contents. - PowerPoint PPT PresentationTRANSCRIPT
Tuesday, 20 May 2003 OPERA Collaboration Meeting - Gran Sasso 1
Status ofStatus offront-end electronics front-end electronics
for the OPERA Target Trackerfor the OPERA Target TrackerLAL Orsay
S.BONDIL, J. BOUCROT, J.E.CAMPAGNE, A.CAZES, C. de LA TAILLE, A. LUCOTTE, G. MARTIN-CHASSARD, L. RAUX, J.P. REPELLIN
BERN UniversityK.BORER, M.HESS
Oscillation Project with Emulsion-tRacking Apparatus
Tuesday, 20 May 2003 OPERA Collaboration Meeting - Gran Sasso 2
Contents
1. Version 2 chip prototype (Reminder)
Chip characteristics
Measurements (made in collaboration with Bern)
2. Version 3 chip prototype – OPERA-ROC (ReadOut Chip)
Chip characteristics
Measurements (made in collaboration with Bern)
3. Conclusion and perspectives
Comparison: Version 2 vs version 3
Production schedule
Production cost
Tuesday, 20 May 2003 OPERA Collaboration Meeting - Gran Sasso 3
32 inputs (Ch1-Ch32), trigger output + 1 multiplexed charge output
Variable gain preamplifier : range 1-3, resolution = 4 bits (1, 0.5, 0.25, 0.125)
Fast shaper (tp = 20 ns, G ~ 20) for auto-trigger (1/3 pe)
Slow shaper (tp = 100 ns, G ~ 1) for charge measurement
On chip track & hold and output multiplexer
Version 2 prototype front-end chip
Technology: AMS 0.8 m BiCMOS Chip area : 10 mm2
Package : QFP100 Power consumption : 250 mW
– Submitted in September 2002
– Received in March 2003– Validated in April 2003
Tuesday, 20 May 2003 OPERA Collaboration Meeting - Gran Sasso 4
Version 2 chip Tests: summary
32-channel chip (version 2)
Preamplifier:
Gain correction
Input impedance
Operational (4 bits): Effective range [0-2.8]
1.5-2k Ohms
Auto-Trigger :
Fast Shaper tP
Fast Shaper Gain
Pedestal spread
Noise RMS
Comparator
tP = 20 ns
800mV/pC ( 130 mV/pe)
~ 0.1 pe
~ 1 mV ( ~ 0.01 pe)
Operational: =100 % down to 1/4 pe
Charge measurement :
Slow Shaper tP
Slow Shaper Gain
Dynamic range
Pedestal spread
Noise RMS
Cross-talk
tP = 100 ns
140 mV/pC ( 22 mV/pe)
[0-75] pe
~ 40 mV ( ~1.5 pe)
0.5 mV ( ~0.02 pe)
~ 1%
– The version 2 chip performance suits the Target Tracker requirements
– Validation procedure is reported in OPERA note 40
1 p.e. = 160 fC @ 106
Tuesday, 20 May 2003 OPERA Collaboration Meeting - Gran Sasso 5
Version 3 chip (Reminder)
Version 3 chip – OPERA ROC(ReadOut Chip) Significant improvements
• Reduced cross-talk (decreased preamplifier input impedance)
• Reduced pedestal spread in charge measurement and autotrigger Main new features included: (tested in a previous test chip: « meccano chip »)
• New preamplifier architecture with low input impedance and increased gain correction range (on 6 bits) : from 0 to ~ 4
• New Fast Shaper structure (differential configuration amplifier) : low offset
• New Slow Shaper structure (Sallen-Key structure and differential configuration amplifier): low offset
• Improved Track & Hold based on Widlar structure
• Register to identify the triggered channel
– Submitted in November 2002
– Received in March 2003– Validated in May 2003
Technology: AMS BiCMOS 0.8 m Chip area : 10 mm2
Package : QFP100 Power consumption : 185 mW
Tuesday, 20 May 2003 OPERA Collaboration Meeting - Gran Sasso 7
Version 3 chip tests: Auto-trigger (I)
Fast Shaper : Fast Shaper Gain:
• ~ 4.5V/pC (~800 mV/pe) Fast Shaper Peaking time:
• tP ~ 15 ns Noise RMS:
• ~ 1 mV (~ 0.01 pe)
Comparator : Efficiency:
=100 % down to 1/10 pe (goal: 1/3) Offset spread:
• ~ 0.02 pe : 2 sources => Fast shaper (main contribution) and Comparator (negligible)
Fast Shaper Vout vs Qin
Vo
ut
(V)
0.12 p.e.
12 p.e.
1.2 p.e.
Gain 2:1
Time (s)
0.02pe
0.02pe
Gain 1
Gain 3
Tuesday, 20 May 2003 OPERA Collaboration Meeting - Gran Sasso 8
Version 3 chip tests: Auto-trigger (II)
Comparator : Time walk :
• Δt~15 ns
15 ns
Hit Register : Allows to Identify the triggered channel :
• Operational
• Crosstalk sensitive for Qinj>20pe
Tuesday, 20 May 2003 OPERA Collaboration Meeting - Gran Sasso 9
Version 3 chip tests: Charge measurement (I)
Measured Performance: Dynamic Range:
• Linearity: < 1% [0-20] pC [0-125] pe Slow shaper Gain (G=1):
• ~125 mV/pC (20 mV/pe) Slow shaper peaking time:
• tp~160 ns
Version 2 Version 3
Dynamic range [0-75] pe Dynamic range [0-125] pe
Slow Shaper Vout vs Qin
Time (s)
Tuesday, 20 May 2003 OPERA Collaboration Meeting - Gran Sasso 10
Version 3 chip tests: Charge measurement (II)
Measured Performance: Track & Hold:
• Fully Operational : Widlar Structure: OK Noise RMS :
• ~ 1.5 mV (0.07 pe) Pedestal spread :
6 mV ( ~ 0.3 pe) peak-to-peak (~ 1 mV expected)
6 mV
20 mV
Version 3
Version 2
Tuesday, 20 May 2003 OPERA Collaboration Meeting - Gran Sasso 11
Channel-to-Channel cross-talk : 2 contributions :
• Capacitive coupling between neighboring channels: less than 0.3% (low input impedance)
• Systematic injection in all channels (comes from power supplies): less than 0.5%
Trigger-Charge cross-talk Cross talk Trigger measurements
• negligible
Version 3 chip tests: Cross-talk
sampling time 1/100
Neihgboring channels
Qinj=1/3 pe
Tuesday, 20 May 2003 OPERA Collaboration Meeting - Gran Sasso 12
Comparison :Version 2 vs Version 3
185 mW250 mWConsumption
QFP 100QFP 100Package
Range 0-3.5 , 6-bit resolution :
0 + (2, 1, 1/2, 1/4, 1/8, 1/16)
Zin ~ 110
3 pF alternate
Range 1-2.8 , 4-bit resolution :
1 + (1, 1/2, 1/4, 1/8, 1/16)
Zin ~ 1.5 to 2 k
None
Gain correction
Input impedance
Input for test pulse
tP=15 ns
4.5 V/pC (700 mV/pe)
~ 0.03 pe
~ 1 mV (~1/1000 pe)
Operational: =100 % down to 1/10 pe
15 ns
Operational
tP=20 ns
800 mV/pC (130 mV/pe)
~ 0.1 pe
~ 1 mV ( ~0.01 pe)
Operational: =100 % down to 1/4 pe
15 ns
None
Fast Shaper tP
Fast Shaper Gain
Pedestal spread
Noise RMS
Comparator
Time walk
Hit register
OPERA-ROC (version 3 chip)Version 2 chip
[0-12pC] ([0-75pe])
±20 mV (± 1 pe)
~ 0.5 mV (~0.02 pe)
tP=110 ns
140 mV/pC (22 mV/pe)
~1%
[0-20pC] ([0-125pe])
±6 mV (±0.3 pe)
~ 1.5 mV (~0.07 pe)
tP=160 ns
125 mV/pC (20 mV/pe)
<1%
Dynamic range
Pedestal spread
Noise RMS
Slow Shaper tP
Slow Shaper Gain
Cross-talk
1 p.e. = 160 fC @ 106
Pre
amp
lifi
erA
uto
-tri
gger
Ch
arge
m
easu
rem
ent
Tuesday, 20 May 2003 OPERA Collaboration Meeting - Gran Sasso 13
Conclusion: Version 2 vs Version 3
Both versions suit the Target Tracker requirements and are validated
Both versions can be used without any new iteration
But version 3 improves significantely version 2
The chip must to be tested with the Bern Front-end board Prototype
– Proposal : OPERA ROC (Version 3) is considered as the baseline chip
Tuesday, 20 May 2003 OPERA Collaboration Meeting - Gran Sasso 14
Production schedule
Production could start in July 2003
Delivery expected in Orsay in October 2003
Test of the mass-produced chips will take place in Orsay in November 2003:
Bench-test set-up has started
Chips available for the collaboration by January 2004
Tuesday, 20 May 2003 OPERA Collaboration Meeting - Gran Sasso 15
Production cost estimation
Both versions are cost equivalent (same area: ~10mm²)
Silicon : 2800 dies (assuming 80% yield and 200 spares) : 48 k Euros
Package : PQFP-100 : 7 k Euros
Total : 55 k Euros (~ 0.7 Euros per channel)
Tuesday, 20 May 2003 OPERA Collaboration Meeting - Gran Sasso 16
Version 3 chip tests: Auto-trigger (I)
Fast Shaper : Fast Shaper Gain:
• ~ 4.5V/pC (~800 mV/pe) Fast Shaper Peaking time:
• tP ~ 15 ns Noise RMS:
• ~ 1 mV (~ 0.01 pe)
Comparator : Efficiency:
=100 % down to 1/10 pe (goal: 1/3) Offset spread:
• ~ 0.05 pe : 2 sources => Fast shaper (main contribution) and Comparator (negligible)
Fast Shaper Vout vs Qin
Vo
ut (
V)
0.12 p.e.
12 p.e.
1.2 p.e.
Gain 2:1
Time (s)