TY - GEN

T1 - Optimization of resistances in RL snubbers for power distribution network of integrated circuits

AU - Yamagata, Ryosuke

AU - Iokibe, Kengo

AU - Toyota, Yoshitaka

PY - 2013/9/4

Y1 - 2013/9/4

N2 - Resonance of parasitic impedances in power distribution network (PDN) can increase leakage of the simultaneous switching noise current from integrated circuits (ICs) in the radio frequency (RF) range. The leaking SSN current is a major possible source of the conducted electromagnetic interference (EMI). A method have been proposed to control the PDN resonance by inserting a parallel RL circuit, RL snubber, to damp the resonance. In the previous work, the optimal resistance of the RL snubbers had been determined based on an equivalent circuit of PDN where equivalent series inductances (ESLs) on package had been neglected. In this work, the equivalent circuit was improved as the ESLs on package were taken into account because they were comparable to those on-board and not negligible. A method determining the optimal resistance was also improved. The RL snubbers were applied with the improved optimal resistance to a typical PDN. Effects of the RL snubbers in reducing the RF power current and in improving the power integrity were demonstrated in circuit simulations. Results of the demonstration confirmed that the improved method for optimal resistance gives more EMI reduction and better PI than the method in the previous work.

AB - Resonance of parasitic impedances in power distribution network (PDN) can increase leakage of the simultaneous switching noise current from integrated circuits (ICs) in the radio frequency (RF) range. The leaking SSN current is a major possible source of the conducted electromagnetic interference (EMI). A method have been proposed to control the PDN resonance by inserting a parallel RL circuit, RL snubber, to damp the resonance. In the previous work, the optimal resistance of the RL snubbers had been determined based on an equivalent circuit of PDN where equivalent series inductances (ESLs) on package had been neglected. In this work, the equivalent circuit was improved as the ESLs on package were taken into account because they were comparable to those on-board and not negligible. A method determining the optimal resistance was also improved. The RL snubbers were applied with the improved optimal resistance to a typical PDN. Effects of the RL snubbers in reducing the RF power current and in improving the power integrity were demonstrated in circuit simulations. Results of the demonstration confirmed that the improved method for optimal resistance gives more EMI reduction and better PI than the method in the previous work.

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M3 - Conference contribution

AN - SCOPUS:84883236635

SN - 9784885522772

T3 - 2013 International Symposium on Electromagnetic Theory, EMTS 2013 - Proceedings

SP - 226

EP - 229

BT - 2013 International Symposium on Electromagnetic Theory, EMTS 2013 - Proceedings

T2 - 2013 21st International Symposium on Electromagnetic Theory, EMTS 2013

Y2 - 20 May 2013 through 24 May 2013

ER -