Connect the power chip to end with a large capacitor and a small capacitor grounding, what is the principle, not simply filtering what, please from the analysis of frequency characteristics, namely when the input Vi output (S), Vo (S), parasitic inductance effects on their. According to the analysis or circuit, uL = L*di (T) /dt analysis... Thank you
What is so complicated that filter, low frequency and large capacitance filter (equivalent to the reservoir, but the large capacitance inductance winding structure has no effect on the high frequency, high frequency, small capacitance counter).
Wow, I meant to say something. But it's almost the same as the two above. But I don't know much about the one you analyzed. In fact, I understand the chip connected to the power supply pin, where there are two capacitors, here is not only the op amp, CPU also. Some digital processing chips, too. In fact, in order to make the chip have a stable power supply. He said the operational amplifier, in fact, is the characteristic triangle thing in turn, and let it turn there are two conditions, is two of its input ports. So if one of these two ports comes from the power source, what if the voltage is not stable enough to ripple? Originally as an op amp, it may have a smaller turn cycle. And in this small cycle, because of the unstable ripple of the power supply. The flip may be affected. That's what I understand. Ha-ha。 I don't know, right?. That is to say, the two capacitors are purely for the sake of better removing the high and low frequency ripple in the power supply. I don't think it's so complicated as you analyze.
What did people use the frequency response analysis, because these elements are not only simple components, the theory analysis is the most simple and effective, and easy to grasp the power flow of the complex circuit, rounding the mathematical relationship between the correlation of small, to design the circuit. Principle analysis is the most important way to analyze the circuit.
The large capacitor (usually electrolytic capacitor) has no effect on the high frequency interference due to the presence of the series equivalent inductance, because the LC can form a resonant, high frequency component, which is equivalent to the absence of the capacitor. The meaning of existence is to provide high capacitance DC component filter on voltage fluctuation of low frequency, output voltage reference, high frequency pulse with small capacitance (ceramic system), because the problem of technology, it does not exist the equivalent inductance of high frequency pulse, it is also effective.
