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Capacitors reduce acoustic noise in CE apps

Posted: 09 Mar 2009 ?? ?Print Version ?Bookmark and Share

Keywords:capacitor chip? CE applications? noise acoustic?

GJ8 multilayer ceramic chip capacitors

Murata Electronics (UK) Ltd's GJ8 series of multilayer ceramic chip capacitors (MLCCs) has been specifically developed to reduce acoustic noise in consumer and industrial electronics applications.

Sound can be generated by the MLCCs at the input to the DC/DC converter in a notebook PC or by capacitors in the control circuit of the LCD module in a mobile phone. This problem is caused by the expansion and contraction of the dielectric element in some MLCCs, which causes the PCB to vibrate at the amplitude of the voltage applied. When the frequency of the voltage applied approaches audio frequencies, a noise can be heard.

Murata's GJ8 series has been specially designed to reduce this problem and is available with capacitance between 1?F and 10?F. The acoustic noise generated by 4.7 to 10?F GJ8 series capacitors represents an improvement of at least 10dB over ordinary MLCCs; for 1?F models the improvement is up to 30dB. The series is available in low-profile models with thicknesses of just 1.25-, 1.60- or 2.50mm depending on capacitance. Rated voltage is up to 50V.

- Henri Arnold
EE Times Europe

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