clear & clean display graphics - pcm411 · twisted pair creates common mode rejection for a 50...
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Clear & Clean Display Graphics
Greg [email protected]
SGC vs. Discrete TP: Provide a 2.7Gb/s Data f f i iTransfer Performance Comparison between Discrete
Twisted Pair #34 Wire Construction and SGC40 50 ohm Impedance Controlled Coaxial Optimum construction as Impedance Controlled Coaxial Optimum construction as used in a typical notebook display application.
I-PEX ExperiencePerformance Parameters: Construction Comparison: All SGC vs. Discrete T.P.
I PEX Experience
pProcess/ Mechanical Integrity
Impedance Control (Tr = 130pS 20/80) Eye Pattern (Time Domain) Frequency Domain Scattering Parameters
Insertion Loss and Return LossInsertion Loss and Return LossFEXT
EMI
I-PEX EXPERIENCE
19951995
Inner InsulationBraid (Shield)Outer Insulation
Construction : SMALL GAUGE COAXIAL WIRE (SGC) vs. Discrete Wire
Center ConductorInner InsulationBraid (Shield)
VERSESInsulation Jacket
VERSESDiscrete Twisted Pair
Center Conductor
Twisted Pair Creates Common Mode Rejection for a 50 ohm transmission Li hi h f ll f l LVDS Si l (0 6 0 9Gb/ ) b t Line which performs well for slower LVDS Signals (0.6~0.9Gb/s) but may have some performance issues at 2.7 Gb/s and higher…
All Small Gauge Coaxial Construction Process1. Cut each SGC wire to exact length.g2. Attach and Fix Each Wire with Laminate to the Pitch plate.3. Score outer insulation batch with CO2 Laser and Remove it.4 Dip the exposed braid shield into Tin for coating4. Dip the exposed braid shield into Tin for coating5. Solder the Grounding Bar onto all the braids6. Score the metal braid batch with YAG Laser and Remove it.7 Score the inner insulation batch with CO2 Laser and Remove it7. Score the inner insulation batch with CO2 Laser and Remove it.8. Dip the exposed center conductor into Tin for coating
SGC 36 Non-impedance controlled wire can safely carry approximately 0 3Amps at 50degC Ambient Temperature
SGC
36
SGC
36
SGC
36
SGC
36 SG
C36
SGC
36
SGC
36 SG
C36
SGC
36
SGC
36
SGC
36 SG
C36
SGC
36
SGC
36
SGC
36
SGC
36
SGC
36
SGC
36
SGC
40 5 0SG
C40 50
SGC
40 50SG
C40 50
SGC
40 5
SGC
40 5
0.3Amps at 50degC Ambient Temperature
NonIm
p
NonIm
p
NonIm
p
NonIm
pN
onImp
NonIm
p
NonIm
pN
onImp
NonIm
p
NonIm
p
NonIm
pN
onImp
NonIm
p
NonIm
p
NonIm
p
NonIm
p
NonIm
p
NonIm
p
0ohm0ohm
0ohm0ohm
50ohm
50ohm
I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I E
Gnd
Gnd
Gnd
Gn
V_
V_
V_
V_
V_
V_
V_
V_
ML
ML 1
ML0
AUX
AUX
ML0I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I G
nd
Gnd
VC
CV
CC
EDID
dddnd
_LED+
_LED+
_LED+
_LED+
_LED -
_LED -
_LED -
_LED -
1--
1+0+X+X-
0--
Pitch Plate for Holding Fine Pitch Alignment
SGCinternalinternal
ger
nger
Fing
er
-+0-0++- nd F
ing
und
Fin
ound
F
G di B
DIFF
1
DIFF
1+
DIFF
0
DIFF
0
AUX
+
AUX
-
Gro
un
Gro
u
Gro
Grounding Bar G
Grounding BargProvides Inherit Strain Relief
Discrete Wire Construction Process
1. Cut each Discrete wire to exact length.2. Attach and Fix Each Wire with Laminate to the Pitch plate.3 S t i l ti b t h ith CO2 L d R it3. Score outer insulation batch with CO2 Laser and Remove it.4. Dip the exposed center conductor into Tin for coating
AWG#34 discrete wire can safely carry approximately 0 385 Amps at AA AA
AWG#34 discrete wire can safely carry approximately 0.385 Amps at 50degC Ambient Temperature . AWG#32 can safely carry approx. 0.45Amps @ 50C.
Twisted
Twisted
Twisted
Twisted
Twisted
Twisted
AW
G 3
AW
AW
G 34 G
ro
AW
G 34 G
ro
AW
G 34 G
ro
AW
G 34 G
ro Pair 2Pair 2
Pair1Pair 1
Pair 0Pair 0
34
WG
34
ound
ound
ound
ound
I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I Pitch Plate for Holding Fine Pitch Alignment
Discreteinternalinternal
--- +++G
nd
Gnd
Gnd
Center Conductor isdirectly attached
Epoxy is used as a strain relief
directly attachedto the contact
PerformancePerformance
Impedance
Eye Patterny
F D i “S” Frequency Domain “S”
EMI
Cable Assembly Under TestSGC C t ti VSSGC Construction VS.
Discrete Twisted Pair ConstructionVESA®
Standard Connector
I-PEX Cab-VS I-PEX FPL-II2043 040 020453-030T-01
20455-030E-0220437-040T-0120439-030E-01
Empirical Probe TestingEmpirical Probe Testing
ImpedanceData Rate of 2.7 Gb/s, Tr = 130pS 20%-80%
SGC40 has superiorpImpedance performance at 2 7Gb/ d t t2.7Gb/s data rate.
connector wire
Discrete Twisted Pair (shielded) has poor (shielded) has poor Impedance performance at 2.7Gb/s pdata rate.
Eye Pattern (Time Domain) Test Setup
Eye Pattern from the Source (TX) PRBS 27-1 , BER 10-9,
Eye Pattern @ RX
The SGC cable had t bl ltacceptable results
The Discrete Twisted Pair Shi ld d bl h d Shielded cable had acceptable results
FREQUENCY DOMAIN “S” Parameters10MHz to 10GHz10MHz to 10GHz
Insertion LossInsertion LossReturn Loss
FEXT
INSERTION and RETURN LOSS TEST SETUPIL & RL
All Cable Results had acceptable IL results
Discrete Twisted Pair with Shield Failed DP1.1a RL Limit
Both Discrete Wire Cables Fail DP1.1a FEXT Limits
EMI Test Setup
The SGC cable had acceptable EMI Performance
EMI Test Results at 2.7Gb/s
The Discrete Twisted without a shield had without a shield had many leaks
The Discrete Twisted with a Shield had acceptable results
WHY use Small Gauge Coaxial Wire?WHY use Small Gauge Coaxial Wire?
Cable Assembly using SGC Cable Assembly without SGC
Clear and Clean Appearance
THANK YOUTHANK YOU