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A Spread Spectrum Clock Generator With Nested Modulation Profile for a High-Resolution Display System
- Authors
- Jun, Jaehun; Bae, Sang-Geun; Lee, Yeonho; Kim, Chulwoo
- Issue Date
- 11월-2018
- Publisher
- IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
- Keywords
- Spread spectrum clock; EMI; nested modulation profile; wireless interference; display interface
- Citation
- IEEE TRANSACTIONS ON CIRCUITS AND SYSTEMS II-EXPRESS BRIEFS, v.65, no.11, pp.1509 - 1513
- Indexed
- SCIE
SCOPUS
- Volume
- 65
- Number
- 11
- Start Page
- 1509
- End Page
- 1513
- ISSN
- 1549-7747
- Abstract
- 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.
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