Noise points are various, a variety of nature.
So the countermeasures of noise (
The noise reduction methods)
In addition, in addition to the capacitance, and zener diodes and noise/surge/ESD suppressor noise components.
Different noise properties, needed for noise reduction components are different.
If it is a DC/DC converters, most will according to the circuit and voltage level, using the LCR to reduce noise.
Use the capacitor
to reduce noise map 】
Below is by adding a capacitor to reduce the DC/DC converter output voltage noise of the sample.
上面的波形是出口端lc滤波器的电容为22µf时,在约200 mhz此时率范围存在180 mvp-
Noise (about p
The waveform is below in order to reduce the noise and added 2200 pf capacitor after the results.
Can be seen from the waveform figure, add 2200 pf capacitor make noise is reduced by about 100 mv.
Below for the added capacitor impedance frequency characteristic.
Answer: choose 2200 pf capacitor, because the impedance lowest near 160 MHZ, using the impedance characteristics, can reduce the amplitude of noise about 2 MHZ.
This is by adding a capacitor to reduce the target noise frequency impedance, thus reducing the amplitude of the noise.
Like this by adding a capacitor to reduce noise, noise (need to grasp
Key points: ・ by reducing the target noise frequency impedance to reduce noise.
Rather than let value)
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