Minutes of the Beetle strategy meeting, Heidelberg, 31. May 2001
================================================================


Present:
========

Niels van Bakel
Martin van Beuzekom
Eddy Jans
Hans Verkooijen
Nigel Smale
Daniel Baumeister
Martin Feuerstack-Raible
Sven Loechner
Michael Schmelling
Ulrich Trunk

(Noise) Measurements with BeetleCO10 (MvB)
==========================================

Noise measurements with the BeetleCO10 resulted in

                        ENC=790e+17.5e/pF

which contradicts the measurements in E. Sexauer's thesis
(ENC=409e+38e/pF) and is lower than the theoretical lower limit of
20.9..25.6e/pF (depending on the excess noise factor). However, for the
measurements on the CO10 no gain calibration for Cp>0 was performed.

--> "Raw Data" of E.S. reqired for comparison (->HD)
--> Further measurements on the CO10 have to be done (->NIKHEF)

Pulse Shapes of BeetleFE10 and BeetleCO10 (NvB)
===============================================

Some "fast shaping" settings with t(0..100%)<25ns were found. The
results are in good agreement with simulation. It was argued that
neither the "Pulse&R" nor the "Step&C" circuits used to emulate a
Si-detector would generate the correct signals.

Presently a BeetleCO10 attached to a Si-detector is irradiated with a
106Ru source.

A VELO beamtest with Beetle11 chips is prepared for 15..23.10.2001.
--> A probecard is needed to test the chips

--> Chips will be bonded test PCBs that are also used by NIKHEF -
only leave the input pads untouched.

--> A decision about the setup has to be made: Integration in the LHCb
    testbeam setup or standalone DAQ?

New Frontends: BeetleFE11 (SL) & BeetleFE12 (UT)
================================================

BeetleFE11: 10 new NMOS frontend channels, differing in feedback (5
variants) and bias network (2 variants) are integrated. Main goal
besides a faster shaping wrt. Beetle10 was to avoid saturation of the
preamp due to huge feedback resistances.

BeetleFE12: 9 new PMOS frontend channels, derived from BeetleFE10's Set2
by increasing the speed of the preamplifier and shaper core. The
variants include 4 different input transistors of the preamp and three
different feedback capacitances of the shaper. Besides faster shaping
the main goal was to achieve noise values similar to that of the NMOS
frontend (27e/pF).

Furthermore a variant of the NMOS frontend with an NMOS feedback
transistor (W/L=4.2um/0.79uM*256) was implemented to prove that the
saturation problem can be overcome this way.

SEU-robust logic: BeetleSR10 (DB)
=================================

The chip implements two versions of the I2C interface, one is the std.
implementation, while the other uses triple redundaant flipflops to
avoid SEU failures. Furthermore two memory blocks (34*8bit) are
implemented.
--> active (hamming code) correction has to be implemented for the bias
registers and is not present on this chip.

Project schedule (MFR)
======================

28.02.2001        Submission of Beetle11
21.05.2001        Submission of BeetleFE11, BeetleFE12 and BeetleSR10

30.05.2001        Beetle11 expected back
15.06.2001      "          "      "  (more realistic)
--> Bond to test PCB (setup from Beetle10 already available)
--> NIKHEF: 2 good chips reqired
--> HD:     "   "    "      "
--> OX:     2 bare dies
--> approx two month time for testing the chips

+-----------------------------------------------------------------+
| Detailed measurements program must be elaborated until june 15. |
+-----------------------------------------------------------------+

--> Beetle1.1 must be bonded to a detector and test for any problems
occuring
by using the LVDS comparator outputs asap

   08.2001/09.2001    FE/SR chips expected back
--> Studies on shaping, noise and irradiation

Spring2002        Earliest date for submission of Beetle12 & Beetle13,
which
has to include the final FE(s) and SEU-robust logic circuits

Summer 2002        Prepare for engineering run of Beetle12 or Beetle13.
    If a production will be shared with other chips (e. g. OTIS or
similar)
    then they have to be ready, too)

Autumn 2003        Mass production of Beetle12 or Beetle13 (plus
additional
chips)


Review 25/26.06.2001
====================

--> A consistent status of the measurements has to be presented
--> Measurement plans have to be presented
--> Submission schedule has to be presented

+---------------------------------------------------------------------+
| Transparencies & ASCI-files have to be ready by 15.06.01 and        |
| should be passed to all people involved in the Beetle's development |
+---------------------------------------------------------------------+