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Measuring a Device in the Time Domain (Option 010 Only)
The HP 8753E Option 010 allows you to measure the time domain response of a device. Time
domain analysis is useful for isolating a device problem in time or in distance. Time and
distance are related by the velocity factor of your device under test. The analyzer measures
the frequency response of your device and uses an inverse Fourier transform to convert the
data to the time domain.
Gating
Time domain analysis allows you to mathematically remove individual parts of the time domain
response to see the effect of potential design changes. You can accomplish this by “gating” out
the undesirable responses.
This section shows you how to use the time domain function to measure a device response by
the following measurement examples:
n
transmission measurement of RF crosstalk and multi-path signal through a surface acoustic
wave (SAW) filter
n
reflection measurement that locates reflections along a terminated transmission line
Transmission Response in Time Domain
In this example measurement there are three components of the transmission response:
n
RF leakage at
near
zero time
n
the main travel path through the device (1.6
ps
travel time)
n
the “triple travel” path (4.8
ps
travel time)
This example procedure also shows you how time domain analysis allows you to mathematically
remove individual parts of the time domain response to see the effect of potential design
changes. This is accomplished
by
“gating” out the undesirable responses. With the “gating”
capability, the analyzer time domain
allows
you perform “what if” analysis by mathematically
removing selected reflections and seeing the effect in the frequency domain.
1. Connect the device as shown in Figure 2-58.
NETWORK ANALYZER
TEST PORT
CABLES
SAW FILTER
!FL
ADAPTERS
pg68e
Figure 2-58. Device Connections for Time Domain Transmission Example Measurement
Making Measurements
2-83