Discrete spread-spectrum sampling (DSSS) to reduce RF emission and beat frequency issues

M.J. Coenen; A.H.M. Roermund, van

Discrete spread-spectrum sampling (DSSS) to reduce RF emission and beat frequency issues

Integrated Circuits

Research output: Chapter in Book/Report/Conference proceeding › Conference contribution › Academic › peer-review

Abstract

Using spread spectrum clocking techniques with digital systems is quite commonly used to reduce RF emission at the higher harmonics, this to fulfill the existing EMC regulations. Results have been reported frequently. However, with analogue interfaces, fixed frequency sampling is still in place for the sake of signal reconstruction. In this paper the use of discrete spread spectrum sampling is introduced which will not only reduce the RF emission from these analogue-to-digital or digital-to-analog interfaces but will also eliminate the effect of beat frequencies. The beat frequency signal resulting from fixed frequency sampling harmonics and a fixed frequency RF interference, will be spread out as sideband noise in the baseband of the intended signal. A similar DSS technique has been introduced in a patented ABCD power conversion concept using 16 (24) fixed frequencies selected randomly.

Original language	English
Title of host publication	Proceeding of APEMC 2010, April 12-16, Beijing, China
Publication status	Published - 2010
Event	conference; Asia-Pacific Symposium on Electromagnetic Compatibility (APEMC 20100, April 12-16, Beijing, China - Beijing, China Duration: 12 Apr 2010 → 16 Apr 2010

Conference

Conference	conference; Asia-Pacific Symposium on Electromagnetic Compatibility (APEMC 20100, April 12-16, Beijing, China
Abbreviated title	APEMC 2010
Country	China
City	Beijing
Period	12/04/10 → 16/04/10
Other	APEMC 2010, April 12-16, Beijing, China

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Cite this

Coenen, M. J., & Roermund, van, A. H. M. (2010). Discrete spread-spectrum sampling (DSSS) to reduce RF emission and beat frequency issues. In Proceeding of APEMC 2010, April 12-16, Beijing, China

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N2 - Using spread spectrum clocking techniques with digital systems is quite commonly used to reduce RF emission at the higher harmonics, this to fulfill the existing EMC regulations. Results have been reported frequently. However, with analogue interfaces, fixed frequency sampling is still in place for the sake of signal reconstruction. In this paper the use of discrete spread spectrum sampling is introduced which will not only reduce the RF emission from these analogue-to-digital or digital-to-analog interfaces but will also eliminate the effect of beat frequencies. The beat frequency signal resulting from fixed frequency sampling harmonics and a fixed frequency RF interference, will be spread out as sideband noise in the baseband of the intended signal. A similar DSS technique has been introduced in a patented ABCD power conversion concept using 16 (24) fixed frequencies selected randomly.

AB - Using spread spectrum clocking techniques with digital systems is quite commonly used to reduce RF emission at the higher harmonics, this to fulfill the existing EMC regulations. Results have been reported frequently. However, with analogue interfaces, fixed frequency sampling is still in place for the sake of signal reconstruction. In this paper the use of discrete spread spectrum sampling is introduced which will not only reduce the RF emission from these analogue-to-digital or digital-to-analog interfaces but will also eliminate the effect of beat frequencies. The beat frequency signal resulting from fixed frequency sampling harmonics and a fixed frequency RF interference, will be spread out as sideband noise in the baseband of the intended signal. A similar DSS technique has been introduced in a patented ABCD power conversion concept using 16 (24) fixed frequencies selected randomly.

M3 - Conference contribution

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