World's smallest chip common mode choke coil

21 September 2005 Circuit & System Protection

Murata claims its DLP0NS is the world's smallest chip common-mode choke coil for high-speed differential transmission line noise suppression.

This product is smaller, thinner and lighter than the company's previous product at 0,85 x 0,65 x 0,45 mm. The coupling coefficient is over 0,98, which suppresses differential mode impedance for the signal pass-band, causing degradation in signal waveforms. 'Coupling coefficient' represents the amount of coupling between coils connected by magnetism. Its maximum value is 1. With common mode choke coils, the higher the coupling coefficient, the lower the differential mode impedance becomes, making the influence to the signal smaller.

Murata has also tried to align the characteristic impedance of the transmission line to suppress input signal reflection. By doing so, common mode noise alone is effectively removed without affecting high-speed signal waveforms.

Three parts with common mode impedance of 67, 90 and 120 Ω (typical value at 100 MHz) are available to allow for a range of choice according to the application.

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