A Spread Spectrum Clock Generator With Nested Modulation Profile for a High-Resolution Display System

A spread-spectrum clock generator is implemented using a nested modulation profile to reduce the peak power levels of radiated electro-magnetic emissions in display products. The display data interface is a potential source of interference, and the spread spectrum technique has been extensively used...

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Bibliographic Details
Published in:IEEE transactions on circuits and systems. II, Express briefs Express briefs, 2018-11, Vol.65 (11), p.1509-1513
Main Authors: Jun, Jaehun, Bae, Sang-Geun, Lee, Yeonho, Kim, Chulwoo
Format: Article
Language:English
Subjects:
Clock generators
Clocks
CMOS
display interface
Electromagnetic interference
EMI
Frequency modulation
Interference
Jitter
Modulation
nested modulation profile
Radiation detectors
Spread spectrum
Spread spectrum clock
Spread spectrum transmission
wireless interference
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Summary:A spread-spectrum clock generator is implemented using a nested modulation profile to reduce the peak power levels of radiated electro-magnetic emissions in display products. The display data interface is a potential source of interference, and the spread spectrum technique has been extensively used for display interfaces. The proposed nested profile can further reduce electro-magnetic interference without any degradation in the other characteristics. A test chip was fabricated using a 55-nm CMOS process, and the test results indicate a 41-dB reduction. The sensitivity of a wireless receiver to interference is tested, and the EVM results for the proposed nested profile exhibits an improvement of 1.4 dB compared to those of the triangular profile.
ISSN:1549-7747
1558-3791
DOI:10.1109/TCSII.2017.2742517