ENA-X and ENA Series Vector Network Analyzers.pdf - 第11页
11 Modulation Distortion Analysi s w ith Vector Signal Sourc e An E5081A with option 2 K 6/2N6/2N7/4K6/4N6/ 4N7 and an externa l modulated source ( e.g., Key sight MXG ) can be combined to sup port both vector netwo rk a…
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E5081A ENA-X with Configurable Test Set
The E5081A ENA-X comes with a configurable test set on ports 1 and 2 to allow for flexible setup of test
systems by integrating with external components
1
such as booster amplifiers, attenuators, or directional
couplers. This functionality combined with modulated signal analysis allows you to characterize highly
integrated components with a single connection.
High-Power S-Parameter Tests
One example using the E5081A with configurable test set is S-parameter measurements of high-power
devices. When you need an input level higher than the analyzer’s source can provide, booster amplifiers
are necessary to increase the power level incident upon the DUT. However, the reference signal is
measured before the booster amplifier with a standard configuration of a 2-port VNA, and temperature
drift or high reverse isolation of a booster amplifier will prevent accurate reflection measurements of the
DUT’s input.
A typical configuration for high-power measurements with the 2-port E5081A is shown. Reflected and
transmitted signals of the DUT are detected with all the logical receivers, and the VNA firmware provides
measured high-power S-parameters.
External components should be selected based on their high-power limits or frequency range
specifications. Be sure that these components can handle the output power level of the booster amplifier.
1. External components are not included with the E5081A. Must be purchased separately.
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Modulation Distortion Analysis with Vector Signal Source
An E5081A with option 2K6/2N6/2N7/4K6/4N6/4N7 and an external modulated source (e.g., Keysight
MXG) can be combined to support both vector network analysis and modulation distortion analysis with a
single connection. RF modulation signals under 6 GHz from the external source are added to the
“Upconverter BB In” (Upconverter baseband input) port on the E5081A’s front panel, and then
upconverted with a built-in upconverter to output mmwave modulated signals at port 1 or port 2 up to
44 GHz. The S960704B (up to 20 GHz) or S960707B (up to 44 GHz) software enable users to measure
the nonlinear behavior of power amplifiers or frequency converting devices under the high-frequency,
wideband modulated stimulus conditions.
The VNA-based vector correction extends the reference planes of the signal source to the DUT’s planes.
As a result, you can achieve excellent signal fidelity resulting in accurate and repeatable modulated
distortion measurements. The system delivers faster, more accurate, and repeatable EVM and ACPR
measurements compared to conventional signal analyzers.
Modulation distortion analysis setup for amplifiers (left), and frequency converters (right)
