ENA-X and ENA Series Vector Network Analyzers.pdf - 第28页

28 Scalar Mixer/ Converter M easurements ( S 96082B ) S96082B provides Fr equency Offset M ode (FOM) to set the frequenc y of the internal source( s) independently from w here the receivers are t uned, and to configure e…

Modulation Distortion (S960704B/S960707B)

This application software with the E5081A ENA-X and a vector signal generator measures the in-channel

and out-of-channel nonlinear behavior of power amplifiers or frequency converters under modulated

stimulus conditions. It is based on a new frequency-domain measurement method that quickly measures

EVM or ACPR and performs VNA calibration to make accurate measurements.

The software provides a full integrated measurement setup including modulation signal generation and

allows the user to easily configure and make the measurements.

E5081A Option 2K6, 2N6, 2N7, 4K6, 4N6 or 4N7 with built-in upconverter are highly recommended for

modulation distortion analysis using the application. While these internal hardware options are not

required in running the application, without them the setup requires external components and is complex.

The options with built-in upconverter greatly simplify the measurements. Vector signal generators

covering frequencies of 6 GHz or higher are supported with the upconverter.

The maximum bandwidth of modulation distortion analysis is limited by the modulation source. For

example, the maximum bandwidth is 960 MHz when used with N5186A with Option B9X (960 MHz

bandwidth), and 2 GHz with M9383A/B or M9384B

The signal generators

supported by this application are:

•

M9383A PXIe Microwave Signal Generator, 1 MHz to 44 GHz

•

M9383B/84B/M9484C VXG Microwave Signal Generator, 1 MHz to 44 GHz / 54 GHz

•

M9410A/11A/15A/20A/21A VXT PXIe Vector Transceiver

•

N5182A/B MXG X-Series RF Vector Signal Generator, 100 kHz/9 kHz to 6 GHz

•

N5186A MXG Vector Signal Generator, 9 kHz to 8.5 GHz

•

N5192A/94A UXG X-Series Vector Adapter Modified Version, 50 MHz to 20 GHz, with U3039ACK

6 GHz Reference Source.

1. The maximum modulation bandwidth of E5081A-2N7/4N7 is frequency dependent. (The maximum bandwidth is 550 MHz for

31.8 GHz to 37 GHz, and 2 GHz for the rest of specified frequency ranges).

2. When Signal Studio is used, a waveform playback license N76xxEMBC is required for the external source. For more

information, refer to Signal Studio Brochure (5989-6448EN).

3. M9420A Option 506 (60 MHz to 6 GHz) is supported. Option 504 (60 MHz to 3.8 GHz) is not supported.

Modulation distortion analysis for frequency converters requires S96083B, vector and scalar mixer/ converter

measurements software. S96082B, scalar mixer/converter measurement software is not sufficient.

This application also includes a VSA IQ data-link feature for sending IQ data from the VNA to Keysight’s

Pathwave 89600 VSA software for demodulation and analysis of EVM, AM-AM/AM-PM, and more. With no

additional license, the data link supports up to 200 MHz of modulation bandwidth with E5081A ENA-X and a

29 MHz bandwidth with E5080B ENA. S96050B/51B software licenses extend the modulation bandwidth to

1.5 GHz/4 GHz with ENA-X.

Scalar Mixer/Converter Measurements (S96082B)

S96082B provides Frequency Offset Mode (FOM) to set the frequency of the internal source(s)

independently from where the receivers are tuned, and to configure external sources using External

Device Configuration. This functionality is also included with S96029/083/084/086/089/090, both B and

A models.

With a simple setup and calibration, this application delivers the highest accuracy for scalar conversion-

loss/gain measurements by combining one-port and power-meter calibrations to remove mismatch errors.

S96082B provides an intuitive and easy-to-use user interface for setting up mixer and converter

measurements, with single or dual conversion stages. It can control external signal generators for use as

LO signals. Supported external sources include the Keysight ESG, PSG, EXG, and MXG Series, as well

as other SCPI-controlled signal generators.

S96082B is compatible with S96084B, which enables measurements of converters with internal Los.

Vector and Scalar Mixer/Converter Measurements

(S96083B)

This application includes the scalar mixer/converter plus phase (SMC+Phase) measurement class that

provides fully calibrated conversion gain/loss, relative phase, and absolute group delay measurements of

mixers and converters without the need for reference or calibration mixers. Eliminating the calibration

mixer requires a U9391C/F/G comb generator

and an external DC power supply capable of sourcing +15

V and 300 mA for U9391C/F or 800 mA for U9391G. A Vector Mixer Characterization (VMC) is also

included for measuring group delay of frequency converting devices. VMC is used to characterize a

calibration mixer supplied by the user.

SMC+Phase with the S96083B provides an intuitive and easy-to-use user interface for setting up mixer

and converter measurements, with single or dual conversion stages. It can control the analyzer’s built-in

source(s) as well as external signal generators for use as LO signals. Supported external sources include

the Keysight ESG, PSG, EXG, and MXG Series, as well as other SCPI-controlled signal generators.

S96083B is a superset of S96082B, so they should not be installed together. S96083B is compatible with

S96084B, which enables measurements of converters with internal Los.

Embedded LO Capability (S96084B)

This application tunes the analyzer’s receivers to the output frequency of the converter under test without

the need for access to internal Los or a common reference signal. S96084B is intended to work with

S96082B and S96083B measurement applications.

1. When a comb generator is used as a phase reference for calibration and the start frequency of the measurement is less than

630 MHz, a user-supplied calibration mixer is required.

Gain Compression Measurements (S96086B)

The Gain Compression Application (GCA) provides input power, output power, gain, and phase at the

compression point of an amplifier or frequency converters, over a specified frequency range. GCA’s

SMART Sweep is very fast and easy-to-use. GCA also includes a guided calibration that corrects for

absolute power levels, frequency response, and mismatch errors.

Intermodulation Distortion Measurements (S96087B)

Using E5080B ENA

The Intermodulation Distortion (IMD) application makes it very easy to set up and calibrate swept-IMD

measurements of both amplifiers and frequency converters. It controls the frequency and power of

internal and external sources and tunes the receivers to the main tones as well as the IMD products in a

single measurement channel. You can sweep either the center frequency of the two stimulus signals, the

frequency spacing of the two stimulus signals about a fixed center frequency, the power of one or both

stimulus signals, or the power of the LO signal. The analyzer can measure intermodulation distortion

products of order 2, 3, 5, 7, or 9, and display the associated intercept points.

A 4-port E5080B with the internal second source option 4x2 is recommended for IMD measurements with

each built-in source generating one tone. The most common method with the E5080B is to use two

reference receivers for power leveling – the first tone signal (f1) is measured with the VNA’s one receiver

(e.g., a1 receiver of port 1), and the second tone signal (f2) is measured with another receiver (e.g., a3

receiver of port 3).

An external combiner (for example, hybrid power dividers 87302C, 87303C, or 87304C) is required to

combine the tones. Any of the remaining ports can be used as the receive port. A typical configuration for

IMD measurements with the 4-port E5080B-4x2 is shown.