On Thu, Jun 6, 2024 at 03:44 AM, <scnuzmj@...> wrote:
I have confusion about the infulence of VBW, in my knowledge, according to the block diagram of the spectrum analyzer, when VBW > RBW, the bandwidth of VBW will great than the video signal(limited by RBW), so the video filter will not filter the video signal, then the change of VBW(still great than RBW) should not affect the smooth effect of the trace. But the actual display is not suitable for this guess, I think I must miss something about video filter.
? The VBW in the tinySA is implemented using a moving point average that simulates a RC filter.? It performs the same as the CONFIG->SAMPLE REP menu option, except the repetition samples and sweep times have been calibrated for each video bandwidth to approximate the equivalent performance of the selected VBW.
? The moving point average implementation of the VBW was the best solution Erik was able provide for anticipated users of the tinySA within the cost constraints of the original project.
Herb
