Transcript Status Presentation (detailed)

Status Presentation
Group 7: 1394b Receiver
Aparna Trimurty
Stancil Starnes
Jeff Shlipf
March 28th, 2002.
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
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
Stage 1: Design details
Stage 1: Test setup
• GTS 1250 GBIC
test system
pattern
generator
• Textronic TDS
7154 Digital
Phosphor
Oscilloscope
Stage 1: Test results
• Ch 2 PRBS7
• Ch2 K28.7
Stage 2
• Purpose: testing the Maxim
Receiver evaluation kits
• MAX 3266 – transimpedance
amplifier(TIA)
• MAX 3264 – limiting amplifier
• Status: Complete.
Stage 2: Design details
• MAX 3266 power
connector designcan 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.
Stage 2: Testing
Stage 3
• Purpose: the design and
fabrication of a functional and
cost effective receiver board
based on the MAXIM board
• Status: in progress
Stage 3: modified design
•Old
design
•New
design
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.
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.
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.
Proposed part list
#
Part Description
Manufacturer Part
Number
Price
(all)
To Obtain
4
.01uF capacitor –
0805
ECJ-2VB1H103K
$.97
Order from
Digikey
3
1nF capacitor –
0805
ECUV1H102MEN
$.97
Order from
Digikey
1
.1uF capacitor –
0805
ECJ-2VF1E104Z
$1.06
Order from
Digikey
2
100 Ohm resistors –
0805
ERJ-6GEYJ101V
$.80
Order from
Digikey
1
67 Ohm resistor –
0805
ERJ-6GEYJ680V
$.80
Order from
Digikey
1
50 Ohm resistor –
0805
ERJ-6ENF49R9V
$.90
Order from
Digikey
3
SWC Power Supply
Connector
RAPC722
$3.12
Edgar
ordered
some
3
Jameco SMA
connectors
901-143-6
N/a
A bag in lab
Future Considerations
1.
2.
3.
4.
5.
6.
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.