Status Presentation

1
Status Presentation

• Group 7 1394b Receiver
• Aparna Trimurty
• Stancil Starnes
• Jeff Shlipf
• March 28th, 2002.

2
Objective of presentation

• To report modifications and advancements to the
  project since the design report.
• Status stages 1 and 2 completed, stage 3 in
  progress

3
Stage 1

• Purpose testing an optomodule out of its
  original environment(TI card) by placing it on a
  evaluation board built by the group.
• Opto module used Agilent technologies HFBR-53D5
• Status Complete

4
Stage 1 Design details
5
Stage 1 Test setup

• GTS 1250 GBIC test system pattern generator
• Textronic TDS 7154 Digital Phosphor Oscilloscope

6
Stage 1 Test results

• Ch2 K28.7

• Ch 2 PRBS7

7
Stage 2

• Purpose testing the Maxim Receiver evaluation
  kits
• MAX 3266 transimpedance amplifier(TIA)
• MAX 3264 limiting amplifier
• Status Complete.

8
Stage 2 Design details

• MAX 3266 power connector design- can connect to a
  regular AC adaptor.
• MAX 3264- changed connectors of ac adaptor to
  match board connector.
• Caused by a lack of accurate 5V power supplies.

9
Stage 2 Testing
10
Stage 3

• Purpose the design and fabrication of a
  functional and cost effective receiver board
  based on the MAXIM board
• Status in progress

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Stage 3 modified design

• Old design

• New design

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Stage 3 Modifications

• 1. The Level pin was grounded on the 3264 to
  maximize output voltage.
• 2.  The Squelch pin was grounded on the 3264 to
  disable squelch. It is important to see all
  signals in testing, no matter how small they may
  be.
• 3. The CAZ1 and CAZ2 pins on the 3264 are left
  open. In the specification sheet it is stated
  that for gigabit Ethernet these pins should be
  left open.
• 4. The Filter pin was left open on the 3266 to
  enable DC cancellation.
• 5. The Loss-of-Signal circuit was omitted to
  further simplify the board. This also allowed
  for the TH pin to be left open as this simply
  sets the threshold of the LOS circuit.

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Stage 3 Modifications

• 6.      The power filtering inductors were
  omitted. This was possible based on the fact
  that three separate supplies will be used and
  long power cords will be used between the board
  and the power supplied.
• 7.      A single 1nF capacitor is used for
  decoupling the power supplies. Based on the use
  of three separate supplies 1nF should suffice.
• 8.      Decoupling capacitors for the input and
  output of the circuit as well as between the TIA
  and LA chips were left in to maintain a good
  signal.

14
Stage 3 PCB layout and design considerations

• Red squares are power supplies. The input power
  is for the TIA, the 2 output ones are for LA ( as
  LA has 2 stages of amplification)
• 3 separate power supplies are used to reduce
  noise on board.
• Board layout assumes front pin of connector is
  ground and the inner pin is VCC. Power supplies
  not following this assumption will be modified to
  work with the design.

15
Proposed part list
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Future Considerations

• Verifying the functionality of PCB board design.
• Having Bob House create the board using the
  gerber file
• Order part list .
• Work on fixing the errors in our Agilent board
  that are ouputing an erroneous eye.
• Solder, test, and troubleshoot the new board in a
  similar manner as the MAXIM kits.
• If board produces a good eye it should be tested
  in conjunction with the 1394b transmitter board
  and OE board.