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PN2060A GHz phase noise measurement using only reference OCXOs. In this post, I extend my earlier posts on using a PN2060A phase noise analyser to measure GHz signals with downconverters but using the same reference OCXOs for both the PN2060A and the local oscillators. This avoids using an additional pair of oscillators for the LO signal generator and the consequential addition to spurious phase noise in the measurement. The results seem plausible for the RF sources I have on hand at 1 GHz and are consistent with the instruments' specifications. https://qsl.net/bg6khc/pn2060c_phase_noise_analyzer.htm Microchip 53100A phase noise analyser for GHz measurement The Microchip application note AN3899 investigates using dual channel downconverters to measure GHz phase noise. A simple modification is to use the local oscillator reference oscillators as the reference oscillators for the PN2060A phase noise analyser. This allows just one reference oscillator for each channel. I don't kno

 Measuring GHz phase noise using a dual-channel downconvert with the PN2060A phase noise analyser https://ww1.microchip.com/downloads/en/Appnotes/AN3899-UHF-and-Microwave-Measurements-with-the-53100A-Phase-Noise-Analyzer-DS00003899A.pdf Digital PLL Frequency Synthesizers: what they are, how they work  https://www.youtube.com/watch?v=5K7Pvc5fxZI Dividing the reference oscillator reduces the frequency step size. Dividing the output allows the phase comparison with the reference clock.