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What is distributed inductance

Position: Home >> News >> Industry News

What is distributed inductance

Pubdate:2013-08-26 00:00 source:http://m.456oim.cn Click:

In the circuit, since the distribution of conductor routing and inductance components exist is called distributed inductance.

For example, the electrolytic capacitor is two films rolled up, roll up such structures at high frequencies have a certain inductance, its effect on the circuit equivalent to the circuit in series with an inductor, the inductance value is distributed inductance . The frequency characteristics of the inductor can be known due to the distributed inductance values generally small, low frequency can not consider the impact of distributed inductance, but for the high frequency AC circuit, the impact of distributed inductance can not ignore.

1. Wirewound precision resistors and distributed parameter potentiometer (distributed capacitance and inductance)

Since wound precision resistors and potentiometers presence distribution parameters, precision wirewound resistors and potentiometers when more turns, often with no sense of winding method around the system, namely the forward and reverse winding turns coiled the same number of turns, to minimize distributed inductance.

2. The distribution parameters of the transmission cable

A transmission cable can be seen from the equivalent circuit distributed capacitance, inductance and resistance distribution coalition.

3. The distribution parameters of the PCB lead

To lead a high-frequency circuit on the PCB, its distributed inductance can not be ignored. Removal of these distributed inductance effects can be widened in order to reduce power and ground power line and ground impedance.

4. The connector of distribution parameters

Circuit board connectors, have distributed inductance of 520nH. DIP's (24) pin IC socket, have distributed inductance of 4 ~ 18nH.

5. The capacitor distribution parameters

The capacitor is the actual "over" capacitors different, "real" capacitor due to its packaging, materials and other aspects, it only has one additional characteristic inductance, resistance. Monolithic ceramic capacitors have very low equivalent series inductance, which has a wide band decoupling, it is more suitable for use as high-frequency circuit decoupling capacitors.

Taken together, these small distribution parameters for the lower frequencies in the circuit is negligible; in high-frequency circuits must be noted.


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