1. ASIC PMm2 Pierre BARRILLON, Sylvie BLIN, Selma CONFORTI,
Frédéric DULUCQ, Christophe de LA TAILLE,
Gisèle MARTIN-CHASSARD, Ludovic RAUX

2. 3 discri thresholds (3*12 bits)
MAROC chip
Multi Anode Read Out Chip
64 channels, variable gain, 64 triggers, multiplexed digitized charge measurement
Performances:
Variable gain preamp PMs non-uniformity correction
Trigger at 1/3 p.e (= 106)
Dynamic range: 0 30 p.e (0 5pC)
Noise = 2fC
Linearity ~ 2%
Cross-talk < 1%
MAROC3 layout (November 2007)
Technology: AMS SiGe 0.35 mm
Die : 4 X 4.2 mm2
Hold signal
Photomultiplier
64 channels
Photons
Variable
Gain
Preamp.
Slow Shaper ns
S&H
Bipolar
Fast Shaper
Unipolar
Gain correction
64*6bits
3 discri thresholds (3*12 bits)
Multiplexed
Analog charge output
LUCID
3 DACs
12 bits
80 MHz encoder
64 Wilkinson 12 bit ADC
64 trigger outputs
Digital charge output
64 inputs
8 février 2008
Gisèle Martin-Chassard

3. Gisèle Martin-Chassard
SPIROC chip
Sipm Integrated Read Out Chip
36 SIPM readout channels
designed in June 07 for CALICE AHCAL (ILC)
Now in test
SPIROC
Techno: AMS SiGe 0.35 mm
Package : CQFP240
Area: 36 mm2
8 février 2008
Gisèle Martin-Chassard

4. Gisèle Martin-Chassard
SPIROC chip
Charge measurement :
2 gains (dynamic range : 1 pe  2000 pe) / 12 bit ADC
Variable shaping time (50ns  100ns )
Time measurement :
12 bit TDC (step~100 ps)
Fast shaper : ~15ns
Auto-Trigger on ½ pe
DAC 8 bits (0-5V) for SiPM gain adjustment
Bunch crossing
Ch. 0
Ch. 1
Analog channel
Analog mem.
36-channel
12 bit
Wilkinson
ADC
for charge
and
time
Meas.
Ch. 35
12-bit counter
Time
digital mem.
Event
builder
Memory
pointer
Trigger
control
Main
SRAM
Com
module
HCAL SLAB
8 février 2008
Gisèle Martin-Chassard

5. Gisèle Martin-Chassard
PMm2 front-end ASIC
Complete front-end chip with 16 channels
To be submitted in march or June 2008
Technology : AMS SiGe 0.35 mm
Characteristics :
16 inputs preamplifier
Variable gain :1  5 (4bits) (common on 16 channels)
PMTs gain adjustment by a factor 4 (8 bits) (channel by channel)
Dynamic range : 0  300 pe
Good linearity (1%)
16 trigger outputs:
Fast shaper (t=15ns)
Low offset discriminator
Threshold provided by common 10bit DAC + 4bit DAC /channel (1/3 pe)
“OR” of 16 triggers output
1 digitized and multiplexed charge output :
Slow shaper with variable shaping time (t=50ns,100ns,200ns)
SCA with depth 2
A complete front end chip with 64 channels was submitted in last June and expected in this October.
I would like remind you of MAROC1 functionality blocks.
MAROC1 contains/is composed of a variable gain preamplifier to adjust the PM gain per channel from 0 to 4.
We have one multiplexed charge output where we can change the peaking time of slow shaper from 20ns to 200ns.
Otherwise there are 64 trigger outputs which can be due to Bipolar Fast shaper or Unipolar Fast Shaper
The unipolar Fast Shaper is followed by 3 discriminators to close to LUCID needs
Each threshold is fixed by internal DAC
8 février 2008
Gisèle Martin-Chassard

6. Gisèle Martin-Chassard
PMm2 front-end ASIC (2)
Coarse time measurement :
24 bit 10MHz
Step : 100ns
12 bit ADC for charge and fine time measurement :
Wilkinson type ADC
T&H on slow shaper for charge measurement
T&H on TDC ramp (100ns) for fine time measurement
2 discriminators with 12 bit ramp (100ms) as threshold
Serialization of digital output information :
Channel number - time stamp – fine time – charge
4bits 24bits bits bits
A complete front end chip with 64 channels was submitted in last June and expected in this October.
I would like remind you of MAROC1 functionality blocks.
MAROC1 contains/is composed of a variable gain preamplifier to adjust the PM gain per channel from 0 to 4.
We have one multiplexed charge output where we can change the peaking time of slow shaper from 20ns to 200ns.
Otherwise there are 64 trigger outputs which can be due to Bipolar Fast shaper or Unipolar Fast Shaper
The unipolar Fast Shaper is followed by 3 discriminators to close to LUCID needs
Each threshold is fixed by internal DAC
8 février 2008
Gisèle Martin-Chassard

7. PMm2 ASIC ARCHITECTURE (analog part)
ramp
TDC
Internal read
MAROC
SPIROC
SPIROC like
NEW
Channel 16
Read
Channel 1
1 digital time
output
12 bits
ADC
Track
& hold
Vref SSH
1 digital charge
output
12 bits
ADC
CRRC2
Slow Shaper
(50 , 100,
200 ns)
Track
& hold
16 charge
inputs
Variable Gain
Amplifier
(1-5)
Hold
1 ext. Common Hold
variable
delay OR
1 OR output
Fast Shaper
(15ns)
Gain Correction
(8bits)
Vref FSH
Discri
16 Trigger outputs
Vref SSH
DAC
4 bits
24 bits
counter
10MHz
absolute time measurement
Bandgap
DAC
10 bits
Threshold
Common
bloc in
channel
bloc
8 février 2008
Gisèle Martin-Chassard

8. Detail of one channel analog part
MAROC
SPIROC
SPIROC like
NEW
Internal read
time Output x1
TDC ramp
Stop
fine time counter x1 Ck
24 bits
counter
10MHz
Coarse time
data
ADC ramp
T&H x1 Ck
24 bits
counter
10MHz
Coarse time
data
Stop
charge counter x1
Charge Output
Slow Shaper
t=50ns,100ns or 200ns in
Auto-trigger
delay
Adjustable and variable gain amplifier
G= 1-5
Adjust = 1-4
50 W
Discri
Trigger Output
Fast Shaper
t= 15ns
Threshold
4-bit DAC
8 février 2008
Gisèle Martin-Chassard

9. Variable slow shaper outputs
PMm2 ASIC simulations
Slow shaper output
Preamplifier output
RC=50ns
RC=100ns
Variable slow shaper outputs
RC=200ns
A complete front end chip with 64 channels was submitted in last June and expected in this October.
I would like remind you of MAROC1 functionality blocks.
MAROC1 contains/is composed of a variable gain preamplifier to adjust the PM gain per channel from 0 to 4.
We have one multiplexed charge output where we can change the peaking time of slow shaper from 20ns to 200ns.
Otherwise there are 64 trigger outputs which can be due to Bipolar Fast shaper or Unipolar Fast Shaper
The unipolar Fast Shaper is followed by 3 discriminators to close to LUCID needs
Each threshold is fixed by internal DAC
8 février 2008
Gisèle Martin-Chassard

10. Gisèle Martin-Chassard
ADC performance
Wilkinson type
64 channels
12 bits
80 µs conversion time
8 février 2008
Gisèle Martin-Chassard

11. Gisèle Martin-Chassard
Conclusion
MAROC :
Measured circuit
Used for PMTs characterization
But low dynamic range
SPIROC :
Circuit with time measurement
Now in test
New development for PMm2:
Time measure (step 1ns)
High dynamic range
Serialized data output
Proto send in June 08
Chip test in fall 2008
8 février 2008
Gisèle Martin-Chassard