Minutes of the Tracker Electronics Meeting 
Oct 9, 2000

Present: Robert, Hartmut, David, Masa, and Wilko


1.	Materials, Hartmut:

Hartmut stated that he is worried about the total material in the Tracker.
This started by David requesting 200um polyimide dielectric material between
the shield plain and top conductor surface of the Kapton face sheets in
accordance with the IPC standards. Hartmut is going to calculate the
radiation lengths of all materials in the tray. David asked about the use of
G-10/FR-4 instead of polyimide since the CTE is about the same and FR-4 is
much cheaper. David pointed out the list of materials that are available for
circuit board fabrication in the IPC-2221, Figure 7-2. It is clear that
boards fabricated from ARAMID with CTE of 6ppm is a much better match to
tungsten and silicon. David is going to find manufacturers of the various
materials listed IPC-2221, Figure 7-2.

2.	Noise tests - QVDD, Masa:
Masa stated he would measure the effect on noise performance of biasing QVDD
on AVDD2 or AVDD as it is now. He will use a 47pF capacitor on the input. He
did not get to it last week.