SJN(Switching Jitter Noise)
1) where was it used ?
We have tried to used 100 mili henrey inductor(RL181S-104J-RC) provided in magnetic component kit provided by element 14. As shown in the figure 1. The inductor was cascaded in series to work as Low Pass filter so that it can attenuate all the noise above 1khz.
Bench setup for using inductor
But instead it was catching radiated electromagnetic field you can see in the figure 4. And it’s FFT spectral graph in figure 5
Figure 2(waveform before using inductor)
Figure3(FFT spectrum graph before using inductor)
Figure 4
Figure 5
2) What is the best solution ?
We decided to leave this problem as if for know until we figure out how to deal with the radiated EMI problem assosiated with it.
3) why we choose the best solution over other ?
Leaving this problem as if for know
Ringing transient noise
1) where was it used ?
We have tried to used 100 mili henrey inductor(RL181S-104J-RC) provided in magnetic component kit provided by element 14. As shown in the figure 1. The inductor was used in series to work as Low Pass filter so that it can attenuate all the noise above 500khz to 2 mhz range. Since Transiant noise is of frequency between 500khz to 2 mhz range.
Bench setup for using inductor
Figure 1(waveform before using inductor)
Figure 2(FFT spectrum graph before using inductor)
Figure 4(waveform after using inductor)
Figure 5(FFT spectrum graph after using inductor)
From the figure 4 and 5 you can see that after using inductor noise was added into the original signal. There was also attenuation of specific signal like transiant ringing noise.
2) What is the best solution ?
We choose capacitance multiplier over inductor because it attenuated the transiant noise at around 14 db that inductor which is around 9db. The inductor also introduce EMI noise for which we are finding solution for it.
3) why we choose the best solution over other ?
We choose capacitance multiplier because it provides the best solution comparative as if for know.