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Averaging is a common technique for obtaining stable measurement results when measuring adjacent channel leakage power ratio (ACLR) and occupied bandwidth (OBW) using a spectrum analyzer.
The MS269xA Signal Analyzer supports these measurements at high speed by using a capture function.

Capture Function Requires No Averaging!

[Ex.1] Measurement using conventional spectrum analyzer
The spectrum analyzer requires more time to measure because it must sweep for the number of averaging times.
[Ex.2] Measurement using signal analyzer
The signal analyzer performs high-speed measurement even at the same number of averaging times by capturing the entire in-band data at one time. (8x high speed)
[Ex.3] Batch capture measurement using signal analyzer
The signal analyzer performs ultra-high-speed measurement by capturing data once for the measurement time equivalent to the averaging times, eliminating the need for averaging. (65x ultra-high-speed)

* The above measurement time is calculated from the time required for 1000 measurements.

Measurement Image

The measurement principle is shown in the image below.

The signal analyzer function cuts the measurement time from 2.6 s to 0.04 s (65x faster) compared to using a conventional spectrum analyzer.

When the Spectrum Analyzer (Ex. 1) sweep time is 95 ms and number of display points is 1001, the time per display point is about 95 µs. To obtain about the same accuracy for one measurement with the Spectrum Analyzer at the Signal Analyzer (Ex. 2), set Analysis Length to 95 µs. Additionally, set Analysis Length to 1900 µs (95 µs x 20 times) to obtain the accuracy for 20 measurement using the Spectrum Analyzer as shown in Ex. 3.

Advantage of Ultra-High-Speed ACLR Measurement

Amplifier adjustment is laborious work (adjustment ‹ › confirmation) requiring confirmation of various performance items, such as the distortion compensation circuit, current adjustment, and frequency characteristics. As a result, careful ACLR adjustment requires a lot of time.