THE FREQUENCY BAND SHIFTER

Summary

The traditional engineering response for testing wireless capabilities often involves selecting an off the shelf instrument with the closest specifications.

The RF frequencies of transmitting equipment are regulated by national governments and are different between global regions. To achieve a global set of test equipment, you normally require different types or versions of RF test equipment tailored for each market. For test systems with multiple test requirements, this often results in a different set of equipment for each measurement requirement. When test requirements are uniform and are not changed over time, this method may be sufficient, but it becomes cumbersome, and ultimately more expensive for testing RF devices.

Application Areas

The Frequency-band Shifter is primarily used in two areas of the communication industry;

  • The design phase of RF communication equipment, for example base-stations.
  • Field test and validation of networks.

Pros related to alternative solutions

The Frequency-band Shifter offers massive cost reductions when used in test-solutions based on traditional simulators like Aeroflex® TM 500. It also provides unparalleled performance related to phase-noise and outperforms build-it-yourself solutions. Last but not least, it also saves considerable space when compared to products of similar functionality.

The Shifter approach

Aliaro Frequency Shifter recognizes the need for a system that can dynamically set the frequencies of tested signals. The example below shows a two-path set up, and how the Frequency-band shifter is placed in-between the base station (DUT) and the simulator.

The architecture of the Frequency-band Shifter enables support for MIMO etc, and with a theoretical support for simultaneously shifting an unlimited amount of paths, all locked to the same reference.

System Description

  • PXI with 2 uplink and 2 downlink converters from National Instruments.
  • LO tuning of the down converter in order to optimize the system performance.
  • LabVIEW application with a GUI and remote control (Ethernet) with frequency preset.