When noise is discussed, the meaning of “noise” is different. In general, probably it means “unwanted or unnecessary signal components.” In this article, “noise” means the unnecessary signal components generated by the system (or tester) itself. It does not include the signal components generated by the device or DUT, directly or indirectly. Therefore, it does not include the power supply noise that caused by the DUT, cross-talk from the signal generated by the DUT nor the ground bounce generated by the DUT. It does include the system background noise, spurious noise generated by the system resources and the noise generated by the system resource itself.  , 319 KB


Test Methodologies

Mixed Signal Lecture Series: DSP-Based Testing Fundamentals 16 - Moving Average

When you measure a signal and it looks noisy, you may want to make it smooth with the moving average. Moving average operation is actually very similar to FIR convolution so that it behaves like a low pass filter. In this article, the frequency characteristics of the moving average and related comb filters are discussed. A different taste of filtering from the FIR convolution is discussed here.  , 705 KB

When I check the spectrum performance of my DAC output with a spectrum analyzer many small spurious frequencies are shown. They are not the harmonics and they are also seen in a lower frequency range. The distances of each spurious frequency component are the same but this distance is not related to the sampling clock of the DAC. What are they?  , 23 KB.

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