4-5 2-Port Amplifier Measurement VNA Measurements
4-10 PN: 10580-00289 Rev. K Vector Network Analyzer MG
4-5 2-Port Amplifier Measurement
Introduction
Another popular 2-port device is the amplifier. For amplifier measurements, configuring the
instrument to low power mode is an important step. This reduces the source power to ensure
that the amplifier and the VNA Master (or LMR Master) do not go into compression. The
screen-captured measurements that are shown in this measurement guide are examples and
may not match any display on your instrument.
Setup Considerations
To measure the amplifier, set source power to low and perform a full 2-port calibration by
using the appropriate connector type. Connect the amplifier between the test ports, and bias
the amplifier. The VNA Master offers both internal and external test port bias supplies.
These can be utilized to power devices that accept bias through their test ports. Also refer to
section “Calibration Considerations” on page 4-16.
Measurement Readout and Interpretation
The screen-captured measurement that is illustrated in Figure 4-8 shows gain (S
21
= TR2),
input match (S
11
= TR1), output match (S
22
= TR4), and isolation (S
12
= TR3)) of an amplifier
all at the same time on different graphs.
Figure 4-8. Gain, Input Match, Output Match, Isolation of an Amplifier
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