Selecting Measurement Parameters; Definition Of S-Parameters; Setting Up S-Parameters - Agilent Technologies ENA Series User Manual

Selecting Measurement Parameters

The E5070/E5071A allows users to evaluate the DUT (device under test) characteristics
using the following measurement parameters.
• S-parameters
• Mixed mode S-parameters
This section describes the definition of S-parameters and how to choose their values. For
the definition and use of mixed mode S-parameters, refer to "Evaluating Balanced Devices
(balance-unbalance conversion function)" on page 158.

Definition of S-Parameters

S-parameters (scattering parameters) are used to evaluate how signals are reflected by and
transferred through the DUT. An S-parameter is defined by the ratio of two complex
numbers and contains information about magnitude and phase of the signal. S-parameters
are typically expressed as follows.
S
out in
out: port number of the DUT from which the signal is output
in: port number of the DUT to which the signal is input
For example, S-parameter S
input signal of port 1 on the DUT, both expressed in complex numbers.

Setting Up S-Parameters

Step 1. Press (or
which measurement parameters will be set up.
Step 2. Press .
Step 3. Press a softkey that corresponds to the desired S-parameter.
S-parameters on the softkeys are expressed as follows.
S
out in
out: test port number of the E5070/E5071A to which the DUT's output signal is input
in: test port number of the E5070/E5071A from which the signal is applied to the DUT
Chapter 3
Setting Measurement Conditions
Selecting Measurement Parameters
is the ratio of the output signal of port 2 on the DUT with the
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) and (or ) to select the trace for
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