Suppression of Common-Mode Radiation and Mode Conversion for Slot-Crossing GHz Differential Signals Using Novel Grounded Resonators

• Published in: IEEE transactions on electromagnetic compatibility Vol. 53; no. 2; pp. 429 - 436
• Main Authors: CHUANG, Hao-Hsiang, WU, Tzong-Lin
• Format: Journal Article
• Language: English
• Published: New York, NY IEEE 01.05.2011; Institute of Electrical and Electronics Engineers; The Institute of Electrical and Electronics Engineers, Inc. (IEEE)
• Subjects: Applied sciences; Bandwidth; Circuit boards; Circuit properties; Common-mode noise; Conversion; Design. Technologies. Operation analysis. Testing; differential signal; Electric, optical and optoelectronic circuits; Electromagnetic compatibility; electromagnetic interference (EMI); Electronic circuits; Electronic equipment and fabrication. Passive components, printed wiring boards, connectics; Electronics; Exact sciences and technology; Frequency ranges; Impedance; Information, signal and communications theory; Insertion loss; Integrated circuit modeling; Integrated circuits; mode conversion; Noise; Oscillators, resonators, synthetizers; Power transmission lines; Printed circuit boards; radio frequency interference (RFI); Reduction; Resonant frequency; Resonators; Semiconductor electronics. Microelectronics. Optoelectronics. Solid state devices; signal integrity (SI); slot line; split plane; Substrates; Telecommunications and information theory; Transmission lines; Performance evaluation; On line; Noise reduction; Electromagnetic compatibility; Implementation; Electromagnetic disturbance; radio frequency interference (RFI); Electromagnetic interference; Electronic packaging; differential signal; Mode conversion; Signal integrity; Common-mode noise; On board equipment; Resonator; Stub line; Printed circuit board; electromagnetic interference (EMI); Bandwidth allocation; Experimental study; Radiofrequency; slot line; split plane; On line processing; Signal processing; System simulation; Printed circuit; Passband; Effectiveness factor; signal integrity (SI); TLM method
• ISSN: 0018-9375; 1558-187X
• DOI: 10.1109/TEMC.2011.2107326

An asymmetrical grounded resonators technique to suppress the common-mode radiation (or electromagnetic interference) and mode conversion caused by the slot-crossing differential signals is proposed. The grounded resonators can be implemented on printed circuit board or package substrate without additional cost by just designing open stubs with shorting via connecting to the reference plane. The design theory based on the transmission line model is developed to estimate the physical length and effective bandwidth of the grounded resonators. In a fabricated example, the measured common-mode passband is from 2.21 to 3.35 GHz with a fractional bandwidth of 41%. Meanwhile, with the integrated grounded resonators, the differential-mode signal can still maintain good signal integrity. The reductions of the mode conversion and the common-mode radiation are also investigated. It shows that the frequency range of more than 5-dB improvement is consistent to the designed common-mode passband. The effectiveness of this novel noise mitigation approach is well validated by both simulation and experiment.