Lightweight Shielding for Circuit Board Electromagnetic Interference Control
Original Publication Date: 1987-Jul-01
Included in the Prior Art Database: 2005-Feb-01
An arrangement is described in which electromagnetic interference (EMI) on a circuit board is controlled by shielding only the noisy components and by filtering the electrical penetrations of the shield. A combination of board-mounted shields and filters are used to control EMI that radiates from circuitry on a printed circuit board. The shields are lightweight, 0.01" copper shields soldered into a circuit board. One application is on a CRT-neck-mounted video amplifier that delivers to the CRT electron gun a 45 V swing at a 16.3 MHz pel rate. Another application is over the fast, noisy Schottky modules on a personal computer adapter card. The shields are bent up from flat, copper-sheet patterns into low-walled, 5-sided boxes. The open side of each box has solder pins spaced at 0.