A 0.076mm2 3.5GHz spread-spectrum clock generator with memoryless Newton-Raphson modulation profile in 0.13μm CMOS

Sewook Hwang, Minyoung Song, Young Ho Kwak, Inhwa Jung, Chulwoo Kim

Research output: Chapter in Book/Report/Conference proceedingConference contribution

6 Citations (Scopus)

Abstract

A spread-spectrum clock generator (SSCG) is a cost-effective solution to reduce EMI, which has become a serious problem in high-speed systems. In applications such as serial links, display drivers and consumer electronics, SSCG is essential or strongly recommended. Control options such as frequency deviation (δ) and modulation frequency (fm) help to satisfy these demands. Furthermore, efficient modulation-profile generation is critical for achieving further EMI reduction and lowering fabrication cost. PLL-based SSCGs are reported in [1-3]. The ΔΣ modulator (ΔΣM) controls the division ratio [1,2] and the phase information of phase detector (PD) [3] to generate a spread-spectrum clock. The self-referenced clock generator uses a capacitor array to generate a spread-spectrum clock [7]. However, they do not have a way to control δ and fm. Dual-loop direct VCO modulation [4] and digital period synthesizer with delay-line [5] are able to control δ and fm. However, [4] requires an additional VCO, which increases the power consumption by 2x, and [5] suffers from a large deterministic jitter through the delay-line and logic circuits. A triangular profile is commonly used in many SSCGs [1,3,4]. Though the implementation of a triangular profile is very simple, its performance is poor. The chaotic PAM modulation in [2] requires complex analog circuits. Recently, a piecewise-linear profile with SRAM was presented in [5]. However, the additional memory consumes a large amount of power and occupies a large area. This paper presents a frequency-locked loop (FLL) based SSCG with frequency-to-voltage converter (FVC) [6], that saves area and provides multiple δ with low bandwidth variation. A memoryless Newton-Raphson modulation profile with multiple f m is also described.

Original languageEnglish
Title of host publication2011 IEEE International Solid-State Circuits Conference - Digest of Technical Papers, ISSCC 2011
Pages360-361
Number of pages2
DOIs
Publication statusPublished - 2011
Event2011 IEEE International Solid-State Circuits Conference, ISSCC 2011 - San Francisco, CA, United States
Duration: 2011 Feb 202011 Feb 24

Publication series

NameDigest of Technical Papers - IEEE International Solid-State Circuits Conference
ISSN (Print)0193-6530

Other

Other2011 IEEE International Solid-State Circuits Conference, ISSCC 2011
CountryUnited States
CitySan Francisco, CA
Period11/2/2011/2/24

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Electrical and Electronic Engineering

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    Hwang, S., Song, M., Kwak, Y. H., Jung, I., & Kim, C. (2011). A 0.076mm2 3.5GHz spread-spectrum clock generator with memoryless Newton-Raphson modulation profile in 0.13μm CMOS. In 2011 IEEE International Solid-State Circuits Conference - Digest of Technical Papers, ISSCC 2011 (pp. 360-361). [5746354] (Digest of Technical Papers - IEEE International Solid-State Circuits Conference). https://doi.org/10.1109/ISSCC.2011.5746354