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- Title
A Low-Power 12-Bit 20 MS/s Asynchronously Controlled SAR ADC for WAVE ITS Sensor Based Applications.
- Authors
Shehzad, Khuram; Verma, Deeksha; Khan, Danial; Ain, Qurat Ul; Basim, Muhammad; Kim, Sung Jin; Rikan, Behnam Samadpoor; Pu, Young Gun; Hwang, Keum Cheol; Yang, Youngoo; Lee, Kang-Yoon; Serra-Graells, Francesc
- Abstract
A low power 12-bit, 20 MS/s asynchronously controlled successive approximation register (SAR) analog-to-digital converter (ADC) to be used in wireless access for vehicular environment (WAVE) intelligent transportation system (ITS) sensor based application is presented in this paper. To optimize the architecture with respect to power consumption and performance, several techniques are proposed. A switching method which employs the common mode charge recovery (CMCR) switching process is presented for capacitive digital-to-analog converter (CDAC) part to lower the switching energy. The switching technique proposed in our work consumes 56.3% less energy in comparison with conventional CMCR switching method. For high speed operation with low power consumption and to overcome the kick back issue in the comparator part, a mutated dynamic-latch comparator with cascode is implemented. In addition, to optimize the flexibility relating to the performance of logic part, an asynchronous topology is employed. The structure is fabricated in 65 nm CMOS process technology with an active area of 0.14 mm2. With a sampling frequency of 20 MS/s, the proposed architecture attains signal-to-noise distortion ratio (SNDR) of 65.44 dB at Nyquist frequency while consuming only 472.2 µW with 1 V power supply.
- Subjects
SUCCESSIVE approximation analog-to-digital converters; INTELLIGENT transportation systems; ANALOG-to-digital converters; DIGITAL-to-analog converters; NYQUIST frequency; COMPLEMENTARY metal oxide semiconductors
- Publication
Sensors (14248220), 2021, Vol 21, Issue 7, p2260
- ISSN
1424-8220
- Publication type
Article
- DOI
10.3390/s21072260