An 8 bit 12 MS/s asynchronous successive approximation register ADC with an on-chip reference

作者：Yu Meng Wu Lipeng Li Fule and Wang Zhihua Institute of Microelectronics Tsinghua University Beijing China

来源：Chinese Journal of Semiconductors, 2013, (02): 113-117.

• analog-to-digital converter
• successive approximation
• asynchronous control logic
• on-chip reference

<正>This paper proposes an 8 bit asynchronous successive approximation register ADC for wireless transceivers.A split capacitor DAC is used to reduce power and area consumption and the value of the split capacitor is calculated theoretically to ensure linearity.Asynchronous control logic is proposed to eliminate the high internal clocks and significantly speeds up the successive approximation algorithm.An on-chip reference with a fully integrated buffer and decoupling capacitor is adopted for avoiding an extra pin for the off-chip reference. The prototype,fabricated in UMC 0.18μm CMOS technology,achieves an effective number of bits of 7.64 bits at a sampling frequency of 12 MS/s.The total power consumption is 0.918 mW for a 1.8 V supply,while the onchip reference consumes 53%of the total power.It achieves a figure of merit of 180 fJ/conv-step,excluding the reference’s power consumption.

• 出版日期2013-2-15
• 单位清华大学