An On-Chip Monitoring Circuit for Signal-Integrity Analysis of 8-Gb/s Chip-to-Chip Interfaces With Source-Synchronous Clock
- Authors
- Lee, Pil-Ho; Lee, Han-Yeol; Lee, Hyun-Bae; Jang, Young-Chan
- Issue Date
- Apr-2017
- Publisher
- IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
- Keywords
- Chip-to-Chip interface; fractional divider; fractional-N phase-locked loop (PLL); frequency synthesizer; inductive peaking; on-chip monitoring circuit (OCMC); subsampling
- Citation
- IEEE TRANSACTIONS ON VERY LARGE SCALE INTEGRATION (VLSI) SYSTEMS, v.25, no.4, pp.1386 - 1396
- Journal Title
- IEEE TRANSACTIONS ON VERY LARGE SCALE INTEGRATION (VLSI) SYSTEMS
- Volume
- 25
- Number
- 4
- Start Page
- 1386
- End Page
- 1396
- URI
- https://scholarworks.bwise.kr/kumoh/handle/2020.sw.kumoh/1087
- DOI
- 10.1109/TVLSI.2016.2639289
- ISSN
- 1063-8210
- Abstract
- This paper presents an on-chip monitoring circuit (OCMC) for analyzing the signal integrity of highspeed signals for a chip-to-chip interface with a source-synchronous clocking scheme. The proposed OCMC consists of a fractional-N phase-locked loop (PLL)-based frequency synthesizer, a high-bandwidth track-and-hold circuit, and a 10-bit analog-to-digital converter (ADC) to implement a subsampling scheme. The proposed fractional-N PLL-based frequency synthesizer improves the time jitter accumulated in a voltage-controlled oscillator using a fractional frequency divider operated by an eight-phase clock. The bandwidth of the track-and-hold circuit is designed to be 6 GHz, using inductive peaking realized through a source follower. The OCMC samples 49 points over two unit intervals of a high-speed input signal when the frequency multiplication of the frequency synthesizer is 6.125/6. The 10-bit ADC uses the architecture of a pipelined successive approximation register ADC to reduce the power consumption and chip area. The proposed OCMC is implemented with 65-nm CMOS technology and a 1.2 V supply. The 8-Gb/s chip-to-chip interface signal is reconstructed with time and voltage resolutions of 5.1 ps and 1.17 mV, respectively.
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