Unlikely to have been from a switching reg -- 1kHz is pretty low. Close-in spurs are often suppressed by some form of cancellation, and a little drift can cause the reappearance of spurs at around that level (or more). That's where I'd look first, anyway. But if it's gone, be happy (unless or until it comes back). :)
Tom
--
Prof. Thomas H. Lee
Allen Ctr., Rm. 205
420 Via Palou Mall
Stanford University
Stanford, CA 94305-4070
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On 3/3/2025 1:42 PM, Jim Ford via groups.io wrote:
In my case it was a Keysight E8257D PSG that showed spurs >-60 dBc at around 1 kHz offset. ?Our project had about a 6 month lull, and when we got back to the lab and set up the benches again, no such spurs could be found! ?I figured the original spur was from a switching regulator, but who knows?
