Specifications

39
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安捷倫科技高頻元件量測研討會
Feb.23, 2006
Automatic Port Extension – Implementation
Measures S
ii
(reflection) of each port
Uses ideal open or short models
Computes electrical delay using best-fit straight-line model
Computes insertion loss using a best-fit dielectric loss model
• Default setting uses frequencies in Active Channel Stimulus
(results in loss at two frequencies)
• Active Marker choice uses frequency at Active Marker
(results in loss at one frequency only)
Computed delay & loss values are automatically displayed via
new port-extension tool bar
Values can be saved as part of instrument state or recorded
for manual insertion next time
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安捷倫科技高頻元件量測研討會
Feb.23, 2006
How is the Loss Term Calculated?
Loss is calculated for each frequency data point (f) as follows:
If Use1 is checked and NOT Use2 then:
• Loss(f) = Loss1 * (f/Freq1) ^ 0.5 (coaxial loss model)
If Use1 AND Use2 are checked, then:
• Loss(f) = Loss1 * (f/Freq1) ^ n (printed circuit board dielectric loss model)
•Where n = log10 [abs(Loss1/Loss2)] / log10 (Freq1/Freq2)