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:

ntransmission measurement of RF crosstalk and multi-path signal through a surface acoustic wave (SAW) filter

nreflection 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:

nRF leakage at near zero time

nthe main travel path through the device (1.6 ps travel time)

nthe “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

SAW FILTER !FLCABLESADAPTERS

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Figure 2-58. Device Connections for Time Domain Transmission Example Measurement

Making Measurements 2-83

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HP 8753E manual Measuring a Device in the Time Domain Option 010 Only, Transmission Response in Time Domain, Gating