Great small capacitance capacitors in parallel significance - maglev Products

Great small capacitance capacitors in parallel significance - magnetic levitation products, because the large capacitance due to the large capacity, it is generally relatively large volume, and often make use of a multi-layer winding way (hands split-off aluminum electrolytic capacitors should be very understanding, did not split You can also take over several different capacitance demolition look at), which led to large distributed inductance capacitance is relatively large (also called equivalent series inductance, the English referred ESL). As you know, the inductance impedance of the high frequency signal is great, therefore, not a large capacitance high frequency performance. Some small-capacity capacitor is just the opposite, due to the small capacity, so the volume can be made very small (to shorten the lead is reduced ESL, because the length of wire can also be seen as an inductor), and often use the plate capacitor structure, so that there is little small capacitor in the ESL, so that it has a very good high frequency performance, but because of the small capacity of the reason, the impedance of the low frequency signal is large. So, if we have to make the low-frequency, high-frequency signal can be a good pass, and then on the use of a large capacitor capacitance and a small way. Often use small capacitance 0.1uF ceramic capacitor, when the higher frequencies, but also smaller capacitor in parallel, such as several pF, hundreds of pF. In a digital circuit, usually given in parallel with a 0.1uF on each chip supply pin capacitance to ground (this is called the decoupling capacitor capacitance, of course, can also be understood as a power supply filter capacitor. It is closer to the position of the chip as possible ), because the signal in these areas are mainly high-frequency signals, the use of smaller capacitor filter on it.

Series-parallel capacitor capacity formula - series-parallel capacitor voltage divider formula

1. tandem formula: C = C1 * C2 / (C1 C2)

2. Parallel formula C = C1 C2 C3

Supplementary part:

Series partial pressure ratio --V1 = C2 / (C1 C2) * V ........ capacitor voltage the greater share of the smaller, under such conditions are the AC-DC

Shunt than --I1 = C1 / (C1 C2) * I ........ Current greater the capacitance by the greater, of course, this is under AC conditions

A small capacitor in parallel on a large capacitance

Large capacitance due to the large capacity, it is generally relatively large volume, and often winding way to create a multi-layer, which leads to large distributed inductance capacitance is relatively large (also called equivalent series inductance, the English referred ESL).

Inductive impedance of the high frequency signal is great, therefore, not a large capacitance high frequency performance. Some small-capacity capacitor is just the opposite, due to the small capacity, so the volume can be made very small (to shorten the lead is reduced ESL, because the length of wire can also be seen as an inductor), and often use the plate capacitor structure, so that there is minimal ESL small capacitor so that it has a very good high frequency performance, but because of the small capacity of the reason, the impedance of the low frequency signal is large.

So, if we have to make the low-frequency, high-frequency signal can be a good pass, and then on the use of a large capacitor capacitance and a small way.

Often use small capacitance of 0.1uF capacitor CBB better (ceramic capacitor is also OK), when the frequency is higher, but also smaller capacitor in parallel, such as several pF, hundreds of pF. In a digital circuit, usually given in parallel with a 0.1uF on each chip supply pin capacitance to ground (this is called the decoupling capacitor capacitance, of course, can also be understood as a power supply filter capacitor, the more close to the chip as possible), because signal in these areas are mainly high-frequency signals, the use of smaller capacitor filter on it.

Ideal capacitor, the impedance decreases with increasing frequency (R = 1 / jwc), but ideal capacitor does not exist, due to the distributed capacitance pin inductance effect in high frequency capacitance no longer a simple capacitor , but it should be seen as a high-frequency capacitor and inductor series equivalent circuit, when the frequency is higher than the resonant frequency, the impedance exhibits increased with increasing frequency characteristics, that is, inductance, capacitance then like an inductor up. Instead inductors have the same characteristics.

Large capacitors in parallel small capacitor in the power supply filter used in a very broad, fundamental reason lies in self-resonance characteristics of capacitance. Capacitors with a good size can be suppressed low to high frequency interference signal power, small capacitors filter high frequency (from high resonant frequency), a large low-frequency filter capacitor (low self-resonant frequency), the two complement each other.