A 3.0 Gsymbol/s/lane MIPI C-PHY Receiver with Adaptive Level-Dependent Equalizer for Mobile CMOS Image Sensor
- Authors
- Choi, Seokwon; Song, Changmin; Jang, Young-Chan
- Issue Date
- Aug-2021
- Publisher
- MDPI
- Keywords
- adaptive level-dependent equalizer; clock recovery; mobile industry processor interface; C-PHY; three-level signal; CMOS image sensor
- Citation
- SENSORS, v.21, no.15
- Journal Title
- SENSORS
- Volume
- 21
- Number
- 15
- URI
- https://scholarworks.bwise.kr/kumoh/handle/2020.sw.kumoh/19377
- DOI
- 10.3390/s21155197
- ISSN
- 1424-8220
- Abstract
- A 3.0 Gsymbol/s/lane receiver is proposed herein to acquire near-grounded high-speed signals for the mobile industry processor interface (MIPI) C-PHY version 1.1 specification used for CMOS image sensor interfaces. Adaptive level-dependent equalization is also proposed to improve the signal integrity of the high-speed receivers receiving three-level signals. The proposed adaptive level-dependent equalizer (ALDE) is optimized by adjusting the duty cycle ratio of the clock recovered from the received data to 50%. A pre-determined data pattern transmitted from a MIPI C-PHY transmitter is established to perform the adaptive level-dependent equalization. The proposed MIPI C-PHY receiver with three data lanes is implemented using a 65 nm CMOS process with a 1.2 V supply voltage. The power consumption and area of each lane are 4.9 mW/Gsymbol/s/lane and 0.097 mm(2), respectively. The proposed ALDE improves the peak-to-peak time jitter of 12 ps and 34 ps, respectively, for the received data and the recovered clock at a symbol rate of 3 Gsymbol/s/lane. Additionally, the duty cycle ratio of the recovered clock is improved from 42.8% to 48.3%.
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