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The Constant Fraction Discriminators CFD8c, CFD7x, CFD4c, CFD1c and CFD1x (11.0.1701.1) Page 3 of 25
Table of Contents
3B. THE CFD TIMING DISCRIMINATOR MODULES ......................................................................................... 6
3
B
.1 G
ENERAL DESCRIPTION
......................................................................................................................................... 6
3
B
.2 P
RINCIPLES OF THE
CFD
CIRCUIT
.......................................................................................................................... 8
3
B
.3 A
DJUSTING THE
CFD
PARAMETER
......................................................................................................................... 9
3b.3.1 Threshold level ............................................................................................................................................ 10
3b.3.2 CFD delay ................................................................................................................................................... 11
3b.3.3 CFD fraction ............................................................................................................................................... 12
3b.3.4 Walk level .................................................................................................................................................... 13
3b.3.5 Output signal width ..................................................................................................................................... 14
3
B
.4 T
HE
V
ETO OPTION
............................................................................................................................................... 14
3b.4.1 Accessing the jumpers in CFD1c / CFD1x ................................................................................................. 16
3b.4.2 Accessing the jumpers in CFD8c and CFD7x ............................................................................................ 16
3b.4.3 Accessing the jumpers in CFD4c ................................................................................................................ 17
3
B
.5 P
ERFORMANCE LIMITATIONS
............................................................................................................................... 18
3b.5.1 Temperature drift ........................................................................................................................................ 18
3b.5.2 Pre-trigger problem .................................................................................................................................... 18
3b.5.3 Cross talk problem ...................................................................................................................................... 19
3
B
.6 T
HE
CFD
X PULSE HEIGHT DETERMINATION OPTION
............................................................................................ 19
3
B
.7 T
HE B
CFD
VERSION OF READ
-
OUT OF BIPOLAR INPUT SIGNALS
........................................................................... 22
LIST OF FIGURES .......................................................................................................................................................... 24
LIST OF EQUATIONS .................................................................................................................................................... 25