A Supply-Scalable-Serializing Transmitter With Controllable Output Swing and Equalization for Next-Generation Standards
- Authors
- Bae, Woorham; Ju, Haram; Park, Kwanseo; Han, Jae duk; Jeong, Deog-Kyoon
- Issue Date
- Jul-2018
- Publisher
- IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
- Keywords
- CMOS; high-speed I/O; regulator; scalability; voltage-mode transmitter
- Citation
- IEEE TRANSACTIONS ON INDUSTRIAL ELECTRONICS, v.65, no.7, pp.5979 - 5989
- Indexed
- SCIE
SCOPUS
- Journal Title
- IEEE TRANSACTIONS ON INDUSTRIAL ELECTRONICS
- Volume
- 65
- Number
- 7
- Start Page
- 5979
- End Page
- 5989
- URI
- https://scholarworks.bwise.kr/hanyang/handle/2021.sw.hanyang/16800
- DOI
- 10.1109/TIE.2017.2779439
- ISSN
- 0278-0046
- Abstract
- Supporting a wide operating range for industrial-standard backward-compatible transmitters often results in energy inefficiency. This paper describes an energy-efficient voltage-mode-serializing transmitter with an operating range of up to 32 Gb/s. The proposed transmitter uses a programmable internal supply to set the voltage level for various data rates optimally, thus improving overall energy efficiency. Output swing and pre-emphasis levels are largely adjustable while the constant output impedance is maintained using a dedicated control loop. CMOS-logic-based circuits and quarter-rate clocking enhance the energy efficiency over the entire data rate range, while a P-over-N voltage-mode driver is used to achieve a high maximum output swing. Two supply regulators with replicas provide constant pull-up and pull-down impedances of the output driver. The variable output swing, pre-emphasis, and internal supply are realized by using segmented output drivers and replicas. The proposed transmitter, fabricated in a 65-nm CMOS process, occupies an active area of 0.173 mm(2). The prototype chip achieves a wide output swing range of 0.4-1.3 V-ppd and an energy efficiency of 2.10-3.45 pJ/bit, across a data rate of 5-32 Gb/s.
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