Preliminary Experiments for Power Supply Noise Reduction Using On-Board Stubs

This paper demonstrates a power supply noise reduction using on-board stubs. A quarter-length stub attached to the power supply line of an LSI chip works as a band-eliminate filter, and suppresses the power supply noise of the designed frequency. Preliminary experiments show that 87% of the designed frequency noise component is suppressed when stub patterns are written on a power supply area on a PCB board for a 1.25 GHz operating LSI. The results show the possibility of the stub onchip integration when the operating frequency of LSIs becomes higher and the stub length becomes shorter. key words: stub, on-board, power supply noise, di/dt noise, PRBS pattern