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應用說明
Characterizing near field communication (NFC) signals for proper timing and amplitude modulation is important to insure reliable communication between polling (initiator) and listening (target) devices. Although there are a variety of available test tools today that can perform automated testing of NFC devices, during the R&D turn-on and debug phase of development it is often necessary to perform these measurements manually on the bench. The ideal tool for viewing and testing RF analog signal quality, including NFC, is an oscilloscope. As opposed to dedicated one-box NFC testers that only provide statically captured/digitized waveforms with pass/fail information, oscilloscopes provide repetitively updated waveforms. This is important because it gives the hardware designer the ability to monitor waveforms for intermittent signal anomalies, as well as the ability to make quick qualitative judgements about overall system operation. Once things are up and running, only then is it time to consider automated design verification testing, which can also be performed using a Keysight oscilloscope-based NFC test system.
This application note focuses on showing you how to use a Keysight InfiniiVision X-Series oscilloscope to trigger on NFC communication, how to demodulate the captured RF waveform, and then how to perform various parametric measurements on the demodulated waveform to verify system performance.
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