PDF《of Ground Bounce Noise》

IEEE MICROWAVE AND WIRELESS COMPONENTS LETTERS, VOL.

16, NO. 5, MAY

2006 267 A Novel Uniplanar Compact Photonic Bandgap Power Plane With Ultra-Broadband Suppression of Ground Bounce Noise Xiao-Hua Wang, Bing-Zhong Wang, Ye-Hai Bi, and Wei Shao Abstract―A novel -bridged photonic bandgap (PBG) power/ ground planes is proposed with ultra-broadband suppression of the ground bounce noise (GBN) in the high-speed printed circuit boards. The -parameters of the proposed low-period struc- tures show that the novel uniplanar compact photonic bandgap (UC-PBG) structures could omni-directionally suppress the GBN in RF/analog circuits and digital circuits. The high omnidirec- tionally suppressions of the GBN for the proposed structure are validated both experimentally and numerically in the noise bandwidth from

300 MHz to

6 GHz, almost the whole noise band. Index Terms―Electromagnetic compatibility (EMC), ground bounce noise (GBN), photonic bandgap (PBG), power/ground (P/G) planes, simultaneously switching noises (SSN). I. INTRODUCTION WITH FAST edge rates, high clock frequencies, and low voltage levels, ground bounce noise (GBN) between the power/ground (P/G) planes is becoming one of the major concerns for high-speed integrated circuits. The GBN can ex- cite resonance modes between P/G planes and cause signi?cant signal integrity (SI) problems and electromagnetic interference (EMI) issues [1]C[3]. In other words, this noise can produce false switching in circuits. And with the ever-increasing clock frequencies, the solution imposed by the GBN in high-speed integrated circuits becomes more and more important. Many research works have contributed to suppress the GBN. Adding decoupling capacitors between the P/G planes is a typical approach to suppress the GBN. But the structures cannot suppress the GBN effectively at frequencies higher than

600 MHz. Recently, the PBG or electromagnetic bandgap (EBG) structures are proposed to eliminate the noise [4]C[10]. Using PBG or EBG structures to form a high impedance surface (HIS), a wider forbidden bandgap bandwidth was achieved in [6]C[8]. However, multilayer substrates with vias are dif?cult to be implemented. So Wu et al. proposed two novel PBG power planes to suppress the GBN in a

3 4 GHz wider bandwidth in [9], [10], respectively. But the proposed structures still not eliminate the GBN below

6 GHz. Manuscript received December 19, 2005;

revised February 15, 2006. This work was supported by the Key Project of Chinese Ministry of Education under Contract 104166, the National Natural Science Foundation of China under Con- tracts 60371008, and 90505001, and the CRT Program of UESTC. The authors are with the Institute of Applied Physics, University of Elec- tronic Science and Technology of China, Chengdu, 610054, China (e-mail: bzwang@uestc.edu.cn). Digital Object Identi?er 10.1109/LMWC.2006.873509 Fig. 1. Nine-cell PBG power plane. (a) Top view. (b) Parameters of a unite cell. In this letter, a novel low-period -bridged PBG power planes is proposed with ultra-broadband suppression GBN from

300 MHz to

6 GHz, almost the whole noise band de- ?ned in [6], [7]. The key features of this new structure are the -bridges, which improve the inductance between two neighboring pads greatly so that they can suppress the noise at low frequencies, and the inserts, which change the ?ow paths of currents so that they can suppress the noise at high frequencies. Good results are obtained by simulation and measurement. II. DESIGN OF THE UC-PBG STRUCTURE In high-speed integrated circuits, P/G planes are embedded in multilayer FR4 substrate. Therefore, in a SI view, the planes should not only keep continuous to supply the dc voltage but also be as a HIS to suppress the high frequency noise. Fig. 1(a) 1531-1309/$20.00 ?