A Spread Spectrum Clock Generator for DisplayPort 1.2 with a Hershey-Kiss Modulation Profile
- Resource Type
- Academic Journal
- Authors
- Seung-Wook Oh; Hyung-Min Park; Yong-Hwan Moon; Jin-Ku Kang
- Source
- JOURNAL OF SEMICONDUCTOR TECHNOLOGY AND SCIENCE. 2013-08 13(4):282-290
- Subject
- SSCG
PLL
Hershey-Kiss modulation profile
sigma-delta modulator
DisplayPort
- Language
- Korean
- ISSN
- 1598-1657
2233-4866
This paper describes a spread spectrum clock generator (SSCG) circuit for DisplayPort 1.2 standard. A Hershey-Kiss modulation profile is generated by dual sigma-delta modulators. The structure generates various modulation slopes to shape a non-linear modulation profile. The proposed SSCC for DisplayPort 1.2 generates clock signals with 5000 ppm down spreading with a Hershey-Kiss modulation profile at three different clock frequencies, 540㎒, 270㎒ AND 162㎒. The measured peak power reduction is about 15.6 ㏈ at 540 ㎒ with the chip fabrciated using a 0.13 ㎛ CMOS technology.