High-current broadband noise issues now solved

12 July 2006 Circuit & System Protection

It is a common problem. The ESL (equivalent series inductance) of a two-terminal capacitor prevents noise suppression across the frequency range, and using a number of capacitors in parallel costs money, takes up space and causes undesirable resonances in those capacitors.

Murata says that it can now offer a simple solution to this problem with its three-terminal capacitor, the FM18PC105R0J3.

In the illustrations, the graph describes the comparable performance of a two terminal capacitor (red graph) and a three terminal device (blue graph) of the same value, showing the better noise suppression. These three terminal capacitors can be used on the output of a DC-DC converter, where voltage fluctuations can cause bit-rate errors and malfunctions. The suppression of radiated noise with a capacitor across the signal and ground lines of an IC can also cause a loop-antenna effect, literally creating a radiating magnetic field. In contrast, with a three-terminal capacitor, two self-cancelling fields are created, thus eliminating potential radiation.

Murata offers three-terminal capacitors in 0603 and 0805 sizes depending on the application. Values range from 0,1 to 1,0 μF, voltage ratings from 6,3 to 25 V d.c. and current ratings up to 4,0 A d.c. Most have an operating temperature range of -55-125°C.

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