NDLI: A study of the interference potential of spread spectrum clock generation techniques

Content Provider	IEEE Xplore Digital Library
Author	Hardin, K.B. Fessler, J.T. Bush, D.R.
Copyright Year	1997
Description	Author affiliation: Lexmark Int. Inc., Lexington, KY, USA (Hardin, K.B.; Fessler, J.T.; Bush, D.R.)
Abstract	A technique to reduce the radiated emissions of digital clock signals and associated harmonics has previously been presented (Hardin et al. 1994). This technique, referred to as spread spectrum clock generation, or SSCG, intentionally broadbands a normally narrowband signal by frequency modulating the trapezoidal clock signal with a unique modulating waveform. As a result of this modulation, the amplitudes of the harmonics of the clock signal can be reduced by as much as 2-22 dB, depending on the frequency of measurement and the frequency deviation. Since the decrease in the amplitudes of the clock harmonics is accomplished by increasing the bandwidth occupied by the harmonics, a number of SSCG clock harmonics may correspond in frequency to an intentionally transmitted signal, such as radio or television. This raises the question of whether SSCG clock generation techniques result in an increase in the interference potential to wideband broadcast receivers as compared to existing clock generation techniques. An additional question which arises is whether existing electromagnetic interference (EMI) measurement procedures are appropriate for products utilizing this technology. The paper presents experimental studies of the interference characteristics of SSCG to broadcast receivers, in particular to television receivers. The results indicate that SSCG presents no greater interference potential to television receivers and in the case of the television audio quality, creates significantly less interference than standard clock generation techniques and that existing EMI measurement procedures are appropriate.
Starting Page	624
Ending Page	629
File Size	657357
Page Count	6
File Format	PDF
ISBN	0780336089
DOI	10.1109/ISEMC.1995.523633
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	1995-08-14
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Spread spectrum communication Clocks Electromagnetic interference TV interference TV receivers TV broadcasting Signal generators Narrowband Frequency modulation Amplitude modulation
Content Type	Text
Resource Type	Article

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