Dual-In-Line Ferrite Attenuator Assembly
Original Publication Date: 1986-Apr-01
Included in the Prior Art Database: 2005-Mar-08
This article describes a modularized packaging of ferrite attenuation components for insertion on printed circuit cards and/or boards as a deterrent to external leakage of high frequency components of 30-300 MHz. Existing personal computers have crystals and oscillators that radiate harmonic frequencies. When an output cable is attached to a printed circuit card and then connected to an external unit, these frequencies will radiate causing special connectors or other devices to be attached to the cable or connector to prevent escapement of these frequencies. In order to suppress EMC (electromagnetic compatibility) emissions, several techniques are available to designers. Some choose to install a ferrite bead within a cable to suppress emissions. Other designers install other protective means.