IN THIS ISSUE
latest news main article new PXI products join newsletter PXISA links

From Bob Helsel, Editor of the PXI Newsletter:


Welcome to the March 2018 edition of the PXI Newsletter.  Our intent is to educate and inform you about how the PXI standard is being used in modular test systems for a wide variety of industries.

In the New PXI Products section, we are showcasing PXI products recently released by members of the PXI Systems Alliance.

Our thanks go to PXI Systems Alliance, the sponsor of this month's issue.

Visit http://www.pxisa.org for more information.

 

How the Digital Down-Conversion (DDC) Functionality
Benefits Your RF Measurement


Submitted by Keysight Technologies

RF Measurement Challenges
For RF signal analysis, it's common to frequency-shift the RF signal to an "Intermediate Frequency (IF)" so that you can use a high-resolution digitizer for a high dynamic range signal acquisition. This then gets sent to a PC for data analysis. However, the complexity of this analysis increases with today's wireless communication systems, such as 5G technologies, 802.11ax standard and so on. Measuring these systems can include complex modulation schemes (e.g. Orthogonal frequency-division multiplexing, OFDM), carrier aggregation, or MIMO (Multi-input Multi-output) /Beamforming signals.

These complications require significant signal processing, which in turn slows the measurement speed. This is a challenge as measurement throughput is critical in most applications, especially in high volume production testing.

In most vector signal analyzers, a digitizer is an indispensable component. For wider bandwidth analysis, you need a high-speed digitizer to capture signals. At the heart of a high-speed digitizer is a powerful FPGA or ASIC which processes data in real-time. This allows data reduction and storage to be carried out at the digital level, minimizing data transfer volumes and speeding-up analysis.

A key feature often available on PXI digitizers is real-time digital down-conversion (DDC). In frequency domain applications, DDC allows engineers to focus on a specific part of the signal using a higher resolution, and transfer only the data of interest to the controller/PC. It works directly on ADC data providing frequency translation and decimation sometimes called "tune" and "zoom".

How Digital Down Conversion (DDC) works
The frequency translation (tune) stage of the DDC generates complex samples by multiplying the digitized stream of samples from the ADC with a digitized cosine (in-phase channel) and a digitized sine (quadrature channel). 


Read more >>

 

Thanks to all our readers.
Bob Helsel, Editor
www.pxisa.org

pxi sidebar


New PXI Products

The PXI platform continues its explosive growth with many new product introductions. New products introduced in the last three months include (listed in the order received):

Keysight M8920A Radio Test Set
RF and audio signal generation and analysis for military, public safety, and avionics radio communications. Keysight’s M8920A Radio Test Set supports many formats by combining PXI hardware with application-specific software in a single flexible and scalable chassis, providing broad multi-format coverage for next-generation radio testing.

Teledyne SP Devices 14-bit Arbitrary Waveform Generator with 2 GS/s Sample Rate
The SDR14TX AWG offers a complement to the previously released ADQ14 and ADQ7 digitizer families and can be used either for stand-alone operation or in system-level solutions with well-matched signal generation and data acquisition performance.

Advanced Testing Technologies PXI/PXIe Inserts
The Advanced Testing Technologies PXI Insert allows the user to easily incorporate PXI/PXIe instruments into an existing VXI chassis.

NI PXIe-1095 Chassis with 58 W Power and Cooling per Slot

The PXIe-1095 chassis offers 58 W of power and cooling in every slot, 50 percent higher than all previous NI PXI Express chassis.

Pickering PXI Microwave Multiplexers
Pickering expands their range of PXI Microwave Multiplexers with new 50GHz modules (model 40-785B). These are single or dual 6-channel multiplexers with relays mounted on the front panel and are designed to switch 50Ω signals up to 50GHz.

Marvin Test Solutions GX7100e Series, GX7205 and GX7215 PXI Chassis
The GX7100e Series are 14-slot PXIe 3U/6U combination Smart chassis with a 4x4 Gen2 backplane, and support both external and embedded controller configurations. The combination of 3U and 6U slots  provides versatility and flexibility in a compact footprint. 

Read more >>

©2018 PXI Systems Alliance (PXISA)
PO Box 1016; Niwot, CO 80544
Published by Bode Enterprises, LLC
www.bodeenterprises-llc.com