Specifications

44
Page 87
安捷倫科技高頻元件量測研討會
Feb.23, 2006
Bandwidth Limit of SMA vs. Microprobes
Measured with SMA connector
Measured with microprobe
Conclusions:
1. Microprobes can be higher
bandwidth (important > 14 GHz)
2. Identical performance < 10 GHz
for these SMA connectors
20 GHz full scale
S
11
- return loss
0 dB
-10 dB
-20 dB
-30 dB
-40 dB
-50 dB
Page 88
安捷倫科技高頻元件量測研討會
Feb.23, 2006
Design for Test (DFT):
Optimized Pad Design for Micro-probing
Any signal via can be used as a probe point
Use a “copper fill” around the signal via with immediate connection to all adjacent ground vias
Every board should be designed with pads for optional microprobing- no impact on function
Ground vias shorted to the copper fill