Abstract
Now-a-days, the usage for the high speed printed circuit boards are increased. Inorder to satisfy the high demand of low cost and size reduction, chips must be integrated in a same package in which the signal integrity issues may occur. One of the major issues is radiated emission. The common mode and differential mode radiation occur when the differential signal crosses the splitted reference plane. In this paper, to reduce the common mode radiation, asymmetric resonators with the interdigital capacitors on the splitted ground plane with shorting vias is implemented. The physical dimensions for the stub and the interdigital capacitors are determined by using the design theory of transmission line model. The insertion loss, return loss and the field pattern are determined using the Ansoft HFSS Tool.
Highlights
In the high speed printed circuit board, the chips must be integrated in a single package
The method of realising a capacitor is by providing a slot in the middle of the conductive strip. This will act as a parallel plate capacitor which is known as the interdigital capacitor (IDC)
The grounded resonators are kept in parallel to the differential line in which one end of them is shorted with vias and the other end is connected with the interdigital capacitors
Summary
In the high speed printed circuit board, the chips must be integrated in a single package. This radiated emission can be reduced by using the stitching capacitors [5] It provides return current path of signal lines. An asymmetrical grounded resonators technique was proposed to reduce the EMI for slot crossing differential signals. These asymmetric resonators with one end shorting to the ground plane provides efficient shorting path between the split planes at different frequencies. The asymmetric grounded resonators with interdigital capacitors is proposed to decrease the slot crossing differential signals. The interdigital capacitors are placed at one end of the stub These resonators provide the return current path and would acts as an inductor. The interdigial capacitors provide capacitance and this capacitance and inductance get cancelled and reduces the radiated emission
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