1. V. Tocut, LAL/IN2P3 Orsay H. Lebbolo LPNHE/IN2P3 Paris1
LPNHE
PId Front End Chip: PIF
V. Tocut,
LAL/IN2P3 Orsay
H. Lebbolo
LPNHE/IN2P3 Paris

2. H. Lebbolo – V. Tocut, SuperB Workshop, Frascati 09/2010
Requirement reminder
Time measurement :
100ps resolution max
1MHz background rate max
50ns double pulse resolution min
Charge measurement : (PM monitoring & barycentre)
necessary ? yes
dynamic range ? ~10 to 20
fine or coarse ? bit
dedicated runs ? always
H. Lebbolo – V. Tocut, SuperB Workshop, Frascati 09/2010

3. H. Lebbolo – V. Tocut, SuperB Workshop, Frascati 09/2010
Charge Measurement
Charge measurements will improve the resolution
H. Lebbolo – V. Tocut, SuperB Workshop, Frascati 09/2010

4. Proposal #1: Babar like  ‘CFD’ like *16 Charge measurement To ADC IN
Low walk discriminator
To TDC
H. Lebbolo – V. Tocut, SuperB Workshop, Frascati 09/2010

5. H. Lebbolo – V. Tocut, SuperB Workshop, Frascati 09/2010
Proposal #1:
In00
Charge
Amplifier
Sample
& Hold
Mux
Charge output
(To ADC)
Synchronization
with
TDC data
State
Machine
Pseudo
CFD
To TDC
H. Lebbolo – V. Tocut, SuperB Workshop, Frascati 09/2010

6. H. Lebbolo – V. Tocut, SuperB Workshop, Frascati 09/2010
CFD Integration
Fast comparator 
Fast comparator
Classical CFD
Proposed pseudo CFD
Delay + Fraction  Gain + Integrators
H. Lebbolo – V. Tocut, SuperB Workshop, Frascati 09/2010

7. H. Lebbolo – V. Tocut, SuperB Workshop, Frascati 09/2010
Spice Simulations
H. Lebbolo – V. Tocut, SuperB Workshop, Frascati 09/2010

8. Prop. #1: Babar like (cfd)
+++
No walk correction if walk < 50ps (depending on PM dynamics)
Charge measurement to improve resolution
---
Need « Time + charge » data synchronization
No PM waveform signal monitoring
2 different chips developed:
analog front end -> {PIF }: CFD like and charge measurement
 time measurement -> {SCATS}
H. Lebbolo – V. Tocut, SuperB Workshop, Frascati 09/2010

9. Prop. #2: charge + waveform
*16
Charge
measurement
MUX + S/H
To ADC
Fast
Amplifier IN 16
Low walk discriminator
To TDC
No waveform monitoring needed !!
H. Lebbolo – V. Tocut, SuperB Workshop, Frascati 09/2010

10. Proposal #3: Time over Threshold (TOT)
SCATS
To FPGA IN 8 16
∆t = f(Q)
TOT not enough accurate
H. Lebbolo – V. Tocut, SuperB Workshop, Frascati 09/2010

11. H. Lebbolo – V. Tocut, SuperB Workshop, Frascati 09/2010
Milestones
PIF the Chip :
first simulations with
CMOS Ams 0.35µ or
CMOS XFAB 0.18µm (NDA just signed)
H. Lebbolo – V. Tocut, SuperB Workshop, Frascati 09/2010