Minutes of the Tracker Electronics Meeting 
November 20, 2000

Present: Robert, David, Dieter, Ned, Hartmut, and Wilko
	
1.	GTFE pad frame; David: David faxed a drawing of the GTFE layout to
UCSC for discussion. Gwelen has a 275um keep clear from the pads to the
outer edges. David will find out what is standard clearance. Gwelen also
wanted the pads to be 120umX250um so he will be able to bond twice. After
some discussion, we agreed the pads can be reduced to 120umX150um. Gwelen
stated that he still wants to try to maintain the 210um pitch of the input
pads from the silicon. The corner pieces of the pad frame was also
discussed. It was pointed that the digital grounds do not go to that part of
the chip and that the pad frame is broken. Therefore we don't need corners
for connection. David will redraw the GTFE design and email the layout in
Autocad format so Gwelen can print it in color.

2.	GTFE schematic; Robert: Robert stated that removing the start bit
was difficult but it is complete now. He started simulation. He also stated
that he saved the schematics on the UCSC Unix server. 

3.	Submissions; Dieter: Dieter stated that he is working on the
simulations. Robert asked if the receivers are added to the submissions.
Dieter stated that they are not part of the submission by will add them.
Dieter asked is the threshold of the receivers have been measured. Robert
stated that this measurement has not been done. Dieter pointer out the
previous GTFE discriminator offsets were dominated by the shaper output
offset. Robert asked Masa if the thresholds could be measured on the old
chips. It was agreed that we would measure the sensitivity by a DC scan of
the discriminators of five chips. Wilko stated that he hopes to have this
completed by the end of next week. 

4.	MCM Capacitors; Wilko: Ned stated that he would like the MCM tested
with a network analyzer with the capacitor values and quantities that is
planned for production. Robert stated that he is concerned about taking Ned
away from the GTFE layout work for this measurement. Ned thought this
measurement is simple if one of the old boards is loaded and ready for
measurement.  Wilko will get one of the older boards loaded and Ned supervise
Max, who will measure the MCM. 
Wilko also stated he is nearly finished with the noise measurements of the
MCM with the reduced capacitance. 

5.	Power supplies for balloon flight; David: David stated that the
power supplies for the balloon flight is supposed to be ready. David asked
what noise specification is required. Robert and Hartmut thought that 3%
noise increase due to power supplies is a good measurable figure. 

6.	GTRC; David.  David asked for the specification document to be read
by UCSC people.

7.	GTFE DAC requirements; Wilko: Wilko is working on the requirements
for the DACs so noise scans are easier to perform. Wilko asked Dieter to
provide the current signal gain and noise numbers for the new design. Dieter
also stated that the DAC accuracy is not better than 20%.