Center Probe 0.4mm Socket Return Loss Test

Aries
0.4 mm Socket Test and Model Results
Gert Hohenwarter
4/21/2014
6200 Gisholt Dr. Ste. 205
MADISON,WI 53713 USA
608-224-1250
[email protected]
1
Objective
• Test socket
• Return loss (S11)
• Insertion loss
• Impedance
6200 Gisholt Dr. Ste. 205
MADISON,WI 53713 USA
608-224-1250
[email protected]
2
Setup
•
•
•
•
Agilent HP8722C VNA option 10
50 MHz-40.05 GHz
Effective risetime ~ 25 ps
Custom probes
•ANSYS HFSS 3D field modeler
6200 Gisholt Dr. Ste. 205
MADISON,WI 53713 USA
608-224-1250
[email protected]
3
Return loss S11 measured
Return loss from PCB side
6200 Gisholt Dr. Ste. 205
MADISON,WI 53713 USA
608-224-1250
[email protected]
4
Return loss S22 measured
Return loss from DUT side
6200 Gisholt Dr. Ste. 205
MADISON,WI 53713 USA
608-224-1250
[email protected]
5
Insertion loss S21 measured
Insertion loss from PCB to DUT side
6200 Gisholt Dr. Ste. 205
MADISON,WI 53713 USA
608-224-1250
[email protected]
6
Impedance measured
Ohms
TDR from PCB toward DUT side
6200 Gisholt Dr. Ste. 205
MADISON,WI 53713 USA
ns
608-224-1250
[email protected]
7
HFSS model
3x4 array for 3D model
6200 Gisholt Dr. Ste. 205
MADISON,WI 53713 USA
608-224-1250
[email protected]
8
Return loss S11
Return loss from PCB side – ‘M’ = model
6200 Gisholt Dr. Ste. 205
MADISON,WI 53713 USA
608-224-1250
[email protected]
9
Return loss S22
Return loss from DUT side– ‘M’ = model
6200 Gisholt Dr. Ste. 205
MADISON,WI 53713 USA
608-224-1250
[email protected]
10
Insertion loss S21
Insertion loss from PCB to DUT side – ‘M’ = model
6200 Gisholt Dr. Ste. 205
MADISON,WI 53713 USA
608-224-1250
[email protected]
11
Impedance
TDR from PCB toward DUT side
‘M’ = model (risetime is faster than measurement and will lead to higher peaks)
6200 Gisholt Dr. Ste. 205
MADISON,WI 53713 USA
608-224-1250
[email protected]
12
Summary
• Return loss performance is best for the edge case since
impedance is closest to 50 Ohms in that configuration
• There is reasonable agreement between model and
measurement up to about 10 GHz.
• It appears a few coils never close completely. This
introduces some uncertainty in the model as their number is
not known.
6200 Gisholt Dr. Ste. 205
MADISON,WI 53713 USA
608-224-1250
[email protected]
13
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