Schematic View

1
Schematic View
RCU
FEC
FEC
RCU
U2F
FEC
FEC
U2F (USB to FEC Interface Card) is an interfaced
card between a PC and the ALICE TPC Front End
Card (FEC)
ALTRO ALICE TPC read Out
PS (USB)
ALTRO CHIPS
2
General Information

• FEC (Frond end Card) has 8 ALTRO Chips
• ALTRO is Mixed Analogue-Digital Integrated
  Circuit dedicated to the digitization and
  processing of Gaseous Detector Signal
• Each ALTRO Chip has 16 channels
• 1 FEC 816128 Channels

3
ALTRO Processing Chain
4
Example of Instructions
70111
64000b 700000
60110
Altro Instruction
Altro Instruction
Write Instruction
Write Instruction
First Part
First Part
4000B00000
0100000000000000101100000000000000000000

0
19
20
24
38
25
Channel Address
Data
Broadcast
12
19
0B
11
5
4
ADC
0
ZS_CFG
Signal
BC2_CFG
DPCFG
BC1_CFG
Fix. Ped.
Data Path Configuration 1
Time
5
First Baseline Correction
The First Baseline correction corrects the
systematic instability of the signal baseline
This type of signal perturbation could be, for
instance, the one produced by a temperature
variation of the electronics components
Signal perturbations created by systematic
effects, like those related to the triggering of
the detector, which affects the signal in terms
of a superimposed noise pattern.
6
Second Baseline Correction
The second level of baseline correction is apply
to the signal during the Processing Time Window
(PTW) and corrects signal perturbations created
by non-systematic effects, which affect to the
signal.
ADC
Time
7
Zero Suppression
ADC
Time