Tiny common-mode choke coil arrays

3 October 2007 Passive Components

Murata has released its DLP1ND series of chip common-mode choke coil arrays – claimed to be the smallest in the industry at 1,5 x 0,65 x 0,45 mm – suitable for noise suppression in high-speed differential transmission lines.

The components boast a coupling coefficient between coils of 0,98 or higher. This helps to ensure low values of differential mode impedance in the signal passband, hence minimising signal waveform distortion. To suppress reflection of input signals, the line impedance of the transmission line and the impedance of the common-mode choke coils are designed to match. In this way, only common mode noise is effectively suppressed, without affecting the high-speed signal waveform.

The series consists of four items, having common-mode impedances of 67, 90, 120, and 160 Ω (at 100 MHz).

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