Reference Voltage Buffer For Hybrid Rc-Dac Sar Adcs In 130 Nm Cmos Process
2021 IEEE INTERNATIONAL SYMPOSIUM ON CIRCUITS AND SYSTEMS (ISCAS)(2021)
摘要
Fast settling, accurate reference voltage buffer (RVB) are one of the key blocks of a successive approximation register (SAR) ADC. This paper presents the design of a RVB, which is aimed to drive SAR ADC architectures with hybrid RC-DAC: a popular implementation for area and power efficient solution. The design challenges associated with the RVB implementation are also discussed using a 12-bit, 8 MSPS SAR ADC as a test vehicle. Implemented in 130nm CMOS process, the buffer operates from a 1.2V supply and consumes 760 mu A current while occupying 1530 mu m(2) of area. It is capable of settling to better than 12-bit accuracy within 3.9 ns and has a total output noise of 87 mu V. Post-layout simulations together with the entire SAR ADC shows a ENOB of 11.5-bits thus confirming that the proposed reference voltage buffer serves the targeted application.
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关键词
hybrid RC-DAC SAR ADC,8MSPS SAR ADC,RVB implementation,SAR ADC architectures,successive approximation register ADC,reference voltage buffer,CMOS process,current 760.0 muA,voltage 87.0 muV,size 130.0 nm,voltage 1.2 V
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