Vfp=-0.35V, Vfs=0.0V, Ipre=200uA
Vfp=-0.35V, Vfs=0.5V, Ipre=200uA
Vfp=-0.35V, Vfs=1.0V, Ipre=200uA
Vfp=-0.35V, Vfs=1.5V, Ipre=200uA
Vfp=-0.35V, Vfs=2.0V, Ipre=200uA
The pictures in the table below give a pulse shape scan at various bias settings and load capacitances. The x-Axis is time in ns. The various curves show the shape for different external load capacitances, i. e. detector capacitances for two Helix chips. The capacitances are 1.6pF, 6.8pF, 16.3pF, 29.4pF and 58pF. The 29.4pF curve was measured twice (hence, since there are two chips measured, there are 4 curves for this value). Higher capacitive load yields lower gain.
The relation between the curve labeled "Reihe 1" ... "Reihe 12" is given in the following table:
| Reihe 1 | 29.4pF |
| Reihe 2 | 29.4pF |
| Reihe 3 | 0pF |
| Reihe 4 | 0pF |
| Reihe 5 | 6.8pF |
| Reihe 6 | 6.8pF |
| Reihe 7 | 29.4pF |
| Reihe 8 | 29.4pF |
| Reihe 9 | 16.3pF |
| Reihe 10 | 16.3pF |
| Reihe 11 | 58pF |
| Reihe 12 | 58pF |
The y-Axis is the measured amplitude in V with an analogue receiver circuit as described in the Helix128-x User manual at the section "The analog receiver circuit" with a feedback resistance of 300Ohms.
The preview links to a Postscript file containing the plot. The text header in each table cell links to an ASCII data file which contains the pulse shape data. Data in this file is organized in columns. The first column contains the time, the other columns contain the pulse shape amplitude.
| Ipre=200uA | |
|---|---|
| Vfs=0.0V |
Vfp=-0.35V, Vfs=0.0V, Ipre=200uA
|
| Vfs=0.5V |
Vfp=-0.35V, Vfs=0.5V, Ipre=200uA
|
| Vfs=1.0V |
Vfp=-0.35V, Vfs=1.0V, Ipre=200uA
|
| Vfs=1.5V |
Vfp=-0.35V, Vfs=1.5V, Ipre=200uA
|
| Vfs=2.0V |
Vfp=-0.35V, Vfs=2.0V, Ipre=200uA
|
Last changes: 99/11/12 by Martin Feuerstack-Raible
If you have comments or suggestions, email Ulrich Trunk