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RF CHARACTERIZATION SUMMARY
Ironwood
ELECTRO NICS
GrypperG80
104468-0009 Contact
1.0 Pitch / 0.6 Ball Diameter
TesT ObjecTive
The objective of this report is to determine the RF transmission characteristics of the Ironwood Electronics Grypper G80 socket for the GSG
(ground-signal-ground) configurations. Two product variations, Pattern 2A and Pattern 8A, at a pitch of 1.0 mm were studied. Three-dimen
-
sional electromagnetic (EM) field models were simulated for sockets with three contacts embedded in the dielectric material at a pitch of 1.0
mm and using a ball diameter of 0.6 mm. Three-dimensional EM field models were also simulated for sockets with nine contacts, one signal
contact surrounded by eight ground contacts, at the 1.0 mm pitch. Schematic level circuit models were then derived from these simulations.
Data derived from the 3D simulations and schematic models determine the electrical specifications for the Grypper G80 socket.
P2A Configuration P8A Configuration Pitches (mm), 0.6 mm Ball Contact Part Number
1.0 104468-0009
elecTrical sPeciFicaTiONs
1.0 mm Pitch P2A Configuration P8A Configuration Value Determination
Time Delay 16.2 pS 13.7 pS Inverse Fast Fourier transform on
the transmission, S21, S-parameter.
Short Circuit Inductance 1.16 nH 0.77 nH Values are determined by a short-
circuit one-port model at 1 GHz.
Open Circuit Capacitance 0.212 pF 0.291 pF Values are determined by an open-
circuit one-port model at 1 GHz.
S21 Insertion Loss -1 dB @ 30 GHz -1 dB > 40GHz Values are based on the 3D model
S11 Return Loss -10 dB @ 7.5 GHz -10 dB > 40 GHz results, except where verified by
-20 dB @ 2.0 GHz -20 dB @ 10 GHz measurements.
Impedance 74 Ω 51.4 Ω Value calculated from Short Circuit
Inductance and Open Circuit
Capacitance.
Crosstalk, S41, GSSG Thru -20dB @ 3.2 GHz N/A Values are based on the 3D model
results.
Pattern 8A
G S G
G G G
G G G
Pattern 2A
G S G
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resulTs FOr PaTTerN 2a
3D Model Simulations for Pattern 2A
Three dimensional EM field simulations were performed using Ansoft’s High Frequency Structure Simulator (HFSS™) software. Measurement
ports are located at the contact points on the top, Port 1, and bottom, Port 2, of the socket. This model was updated to reflect the UV cured
silicone based adhesive shown in light gray.
Figure 2 and Figure 3 show results for the GSG 2-port configuration at 1.0 mm pitch.
Measurements for Pattern 2A
P2A measurements are not available at this time.
Schematic Model for Pattern 2A Configuration
Agilent’s Advanced Design System (ADS) was used to construct a GSG schematic model matching the 1.0 mm pitch socket simulation results.
The topology selected matches that of the three contacts used in the simulation. The GSG schematic model consists of ten passive components.
The signal contact is represented along the top by series inductors totaling 912 pH series inductor. The two ground return paths are joined
together in parallel and represented along the bottom series inductors, totaling 456 pH. Shunt capacitors bridge the signal contact and the
ground return path. Total capacitance is 212 fF. Finally, an added mutual inductance 60 pH represents the mutual coupling between the two
ground contacts and signal.
0.00
0.00
0.20 0.50 1.00 2.00 5.00
0.20
0.50
1.00
2.00
5.00
-0.20
-0.50
-1.00
-2.00
-5.00
(S11)
dB
0
0 30
GHz
-5
-10
-25
-30
-15
-20
2520105 15
(S21)
(S11)
Figure 3. GSG P2A Return Loss plotted on Smith chart, 1.0 mm pitch
Figure 2. GSG P2A Insertion Loss and Return Loss, 1.0 mm pitch
Frequency Response 1 GHz to 30 GHz Return Loss 1 GHz to 30 GHz
X
Z