Improved Video Interface Made by Pulse Transformer and Differential Receiver
Original Publication Date: 1986-Feb-01
Included in the Prior Art Database: 2005-Mar-08
This article describes a solution to a problem in the CRT display terminal concerned with the radiated electromagnetic interference (EMI) (E-Field) from the interface between logic and monitor portions. Today, it is quite important for CRT display terminals, in particular for low-end ones, to comply with the regulation of radiated EMI (E-Field Strength), such as US FCC-EMI, GERMAN VDE-RFI, etc.. One of the main radiation sources is the interface portion between the logic and monitor portions, on which the high frequency video signal runs through a long way (for example, 100 cm). Fig. 1 shows the proposed new video interface which can improve the radiated EMI characteristics.