AN4511 datasheet(9/21 Pages) STMICROELECTRONICS

tên linh kiện	AN4511

Giải thích chi tiết về linh kiện	Common mode filters

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AN4511

The main parameters

This section shows how to measure the common mode and the differential mode

impedance, see Figure 7. The equipment can be an impedance meter such as the E4991A

from Agilent technology, working up to 3 GHz.

Figure 7. Differential and common mode impedance measurement

Figure 8 shows the variation of impedance versus frequency. Differential impedance at low

frequency represents the sum of inductance resistances of the filter.

Figure 8. Typical common mode and differential mode impedance vs. frequency

(ECMF04-4HSM10)

However, CMF can be chosen by using insertion losses. Two main parameters are defined:

•

SCC21 common mode rejection, the filter efficiency cuts the unwanted noise in a

specific frequency range

•

SDD21 defines the differential bandwidth of the filter, the filter ability to drive the main

signal without distortion

AN4511 bảng dữ liệu(PDF) 9 Page - STMicroelectronics