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Description
Keysight Technologies J7201A/B/C attenuation control units increase the efficiency and throughput of the benchtop and ATE testing. The instrument provides an ideal solution for R&D and manufacturing engineers in wireless communications, tasked with designing, validating and manufacturing multi-technologies wireless communication component and devices such as WiFi, WLAN components and mobile handset base transceiver station (BTS) handover testing. These standalone instruments offer a user-defined attenuation sweep function which lets you set the desired attenuation range, step size, number of cycles and attenuation configuration based on your application’s requirements.
Exceptional insertion loss repeatability per section and excellent attenuation accuracy and flatness over the entire operating life of 5 million cycles ensure precise measurements and reduce calibration intervals reducing the cost of test.
Designed in a half-rack, 2 unit high-form factors, the J7201A/B/C are packed with features and functions that are easily accessible via the soft keys and the rotary knob located on the front panel. LXI Class C
compliancy provides GPIB, USB and LAN connectivity for easy remote control and triggering through a full-featured graphical web interface. Calibration data is stored in the instrument’s memory for fast, easy retrieval.
Figure 1 and 2 show test setups for measuring receiver sensitivity. The receiver sensitivity test measures a receiver’s performance using known signal conditions including: modulation and coding type, SNR, and power input levels. Using the specified conditions, receivers must be able to decode data bits with a specified bit error rate (BER) at different input power levels.
Many manufacturers have opted to use costly, high-end signal generators to get accurate power levels across a wide range. However, although these instruments usually provide > 0.4 dB accuracy, at lower power levels where receiver sensitivity tests are being carried out, the accuracy is often ± 1 dB. The power level of the test signal is important as a small change in the input power level can greatly affect the BER performance of the receivers. For more information, refer to the application note Power Accuracy in Receiver Sensitivity Test, literature number 5989-8768EN.
Figures 1 and 2 show you how to use an external attenuator to get fast and accurate power levels for mobile receiver sensitivity test. The J7201A/B/C attenuation control units are used with a signal generator to provide extremely accurate power measurements. Calibration can be done at one relatively high-power level, for instance 0 dBm, and then the signal level is stepped down through the attenuation control unit. In this way, the power level from the source can be kept at a constant eliminating power level linearity problems in the test signal. Corrected attenuation data is provided at each attenuation level of the attenuation control unit’s frequency range (from DC to 6/18/26.5 GHz), this gives you the exact input power level for each DUT. This also ensures test signal accuracy at very low power levels where a slight difference in the input test signal level has an adverse effect on DUT performance. The attenuation control unit’s superb repeatability per section ensures the accuracy and stability of the input power.
Generally, this method improves amplitude accuracy, reduces the output noise floor of the test stimulus, and ensures a consistent and linear performance of the input signal regardless of its level. Because the packet error rate (PER) and frame error rate (FER) are highly sensitive to the input power level, this will have high impact on the yield of the receiver test.
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