Electrical Requirements
R
24 mPGA604 Socket
Mechanical Design Guide
4.3.1 Design Procedure for Inductance Measurements The measurement equipment required to perform the validation is:
• Equipment - HP8753D Vector Network Analyzer or equivalent.
• Robust Probe Station (GTL4040) or equivalent.
• Probes - GS1250 & GSG1250 Air-Co-Planar or equivalent.
• Calibration – Cascade Calibration Substrates or equivalent.
• Measurement objects - Sockets, Motherboards.
Measurement Steps:
1. Equipment Setup:
a. Cables should be connected to the network analyzer and to the probes using the
appropriate torque wrench to ensure consistent data collection every time the
measurement is performed.
2. Set VNA:
a. Bandwidth = 300KHz – 3GHz with 801 points.
b. Averaging Factor = 16.
3. Perform Open/Short/Load Calibration:
a. Calibration should be performed at the start of any measurement session.
b. Create Calibration Kit if necessary for 1st time.
c. Do not perform port extension after calibration.
4. Check to ensure calibration successfully performed.
5. Measure the inductance of the socket mounted to the motherboard fixture by probing the
locations on the PGA Adapter and socket assembly:
a. Call this assemblysocket
L.
b. Export data into MDS/ADS or (capture data at frequency specified in item 6 of
Table 4-1).
6. Measure the inductance of the PGA Adapter by probing on the pads. Call this sandwich
L:
a. Measure 30 units.
b. The test board for 30 units must be chosen from different lots. Use 5 different lots, 6
units from each lot.
c. Export data into MDS/ADS or (capture data at frequency specified in item 6
of Table 4-1).
d. Calculate sandwich
L.
e. For each socket unit, calculate
sandwich
assemblysocketsocket LLL −=
It means sandwich
L will be subtracted from each assemblysocket
L and the result will be
compared with spec value for each individual socket unit.