![]() ![]() ![]() However, it should be remembered that they are measuring the same phenomena, albeit with a different approach. Each of these two categories of equipment has its own set of advantages and disadvantages. Frequency domain equipment usually comes in the form of a spectrum analyzer, a spectrum analyzer with phase noise measurement capability or a phase noise analyzer. Time domain equipment typically comes in the form of a high-speed digital oscilloscope with high single-shot sampling bandwidth. Most modern equipment that measures jitter can be placed into one of two broad categories: time domain and frequency domain. Here are some practical pointers and observations to assist in situations where clock signals have been divided down from higher frequency voltage-controlled oscillators (VCOs). The engineer is also constantly looking for methods of expanding the reach of the equipment at hand. While measuring ultra low-jitter devices and equipment, the engineer is continually required to ask whether the measurement values are the result of the device under test (DUT) or if they are due to the equipment being used. As clock speeds and communication channels run at ever higher frequencies, accurate jitter and phase noise measurements become more important, even as they become more difficult and expensive to manage.
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