Spread-Spectrum Clocking in Switching Regulators for EMI Reduction

Takayuki DAIMON; Hiroshi SADAMURA; Takayuki SHINDOU; Haruo KOBAYASHI; Masashi KONO; Takao MYONO; Tatsuya SUZUKI; Shuhei KAWAI; Takashi IIJIMA

Spread-Spectrum Clocking in Switching Regulators for EMI Reduction

Takayuki DAIMON, Hiroshi SADAMURA, Takayuki SHINDOU, Haruo KOBAYASHI, Masashi KONO, Takao MYONO, Tatsuya SUZUKI, Shuhei KAWAI, Takashi IIJIMA

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This paper describes a simple, inexpensive technique for intentionally broadening and flattening the spectrum of a DC-DC converter (switching regulator) to reduce Electro-Magnetic Interference (EMI). This noise spectrum broadening technique involves intentionally introducing pseudo-random dithering of control clock timing, which can be achieved by adding simple digital circuitry. This technique can significantly reduce noise power spectrum peaks at the DC-DC converter output. For our test case circuit, measurements showed that noise power was reduced by 5.7 dBm at the main peak, by 15.6 dBm at the second peak and by 12.8 dBm at the third peak. This simple, inexpensive technique can be applied to most conventional switching regulators by adding simple digital circuitry, and without any modification of the design of other parts.

Publication: IEICE TRANSACTIONS on Fundamentals Vol.E86-A No.2 pp.381-386

Publication Date: 2003/02/01

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Type of Manuscript: Special Section PAPER (Special Section on Analog Circuit Techniques and Related Topics)

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Takayuki DAIMON, Hiroshi SADAMURA, Takayuki SHINDOU, Haruo KOBAYASHI, Masashi KONO, Takao MYONO, Tatsuya SUZUKI, Shuhei KAWAI, Takashi IIJIMA, "Spread-Spectrum Clocking in Switching Regulators for EMI Reduction" in IEICE TRANSACTIONS on Fundamentals, vol. E86-A, no. 2, pp. 381-386, February 2003, doi: .
Abstract: This paper describes a simple, inexpensive technique for intentionally broadening and flattening the spectrum of a DC-DC converter (switching regulator) to reduce Electro-Magnetic Interference (EMI). This noise spectrum broadening technique involves intentionally introducing pseudo-random dithering of control clock timing, which can be achieved by adding simple digital circuitry. This technique can significantly reduce noise power spectrum peaks at the DC-DC converter output. For our test case circuit, measurements showed that noise power was reduced by 5.7 dBm at the main peak, by 15.6 dBm at the second peak and by 12.8 dBm at the third peak. This simple, inexpensive technique can be applied to most conventional switching regulators by adding simple digital circuitry, and without any modification of the design of other parts.
URL: https://global.ieice.org/en_transactions/fundamentals/10.1587/e86-a_2_381/_p

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@ARTICLE{e86-a_2_381,
author={Takayuki DAIMON, Hiroshi SADAMURA, Takayuki SHINDOU, Haruo KOBAYASHI, Masashi KONO, Takao MYONO, Tatsuya SUZUKI, Shuhei KAWAI, Takashi IIJIMA, },
journal={IEICE TRANSACTIONS on Fundamentals},
title={Spread-Spectrum Clocking in Switching Regulators for EMI Reduction},
year={2003},
volume={E86-A},
number={2},
pages={381-386},
abstract={This paper describes a simple, inexpensive technique for intentionally broadening and flattening the spectrum of a DC-DC converter (switching regulator) to reduce Electro-Magnetic Interference (EMI). This noise spectrum broadening technique involves intentionally introducing pseudo-random dithering of control clock timing, which can be achieved by adding simple digital circuitry. This technique can significantly reduce noise power spectrum peaks at the DC-DC converter output. For our test case circuit, measurements showed that noise power was reduced by 5.7 dBm at the main peak, by 15.6 dBm at the second peak and by 12.8 dBm at the third peak. This simple, inexpensive technique can be applied to most conventional switching regulators by adding simple digital circuitry, and without any modification of the design of other parts.},
keywords={},
doi={},
ISSN={},
month={February},}

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TY - JOUR
TI - Spread-Spectrum Clocking in Switching Regulators for EMI Reduction
T2 - IEICE TRANSACTIONS on Fundamentals
SP - 381
EP - 386
AU - Takayuki DAIMON
AU - Hiroshi SADAMURA
AU - Takayuki SHINDOU
AU - Haruo KOBAYASHI
AU - Masashi KONO
AU - Takao MYONO
AU - Tatsuya SUZUKI
AU - Shuhei KAWAI
AU - Takashi IIJIMA
PY - 2003
DO -
JO - IEICE TRANSACTIONS on Fundamentals
SN -
VL - E86-A
IS - 2
JA - IEICE TRANSACTIONS on Fundamentals
Y1 - February 2003
AB - This paper describes a simple, inexpensive technique for intentionally broadening and flattening the spectrum of a DC-DC converter (switching regulator) to reduce Electro-Magnetic Interference (EMI). This noise spectrum broadening technique involves intentionally introducing pseudo-random dithering of control clock timing, which can be achieved by adding simple digital circuitry. This technique can significantly reduce noise power spectrum peaks at the DC-DC converter output. For our test case circuit, measurements showed that noise power was reduced by 5.7 dBm at the main peak, by 15.6 dBm at the second peak and by 12.8 dBm at the third peak. This simple, inexpensive technique can be applied to most conventional switching regulators by adding simple digital circuitry, and without any modification of the design of other parts.
ER -