8位12MS/s带片上参考电压的异步逐次逼近模数转换器

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.

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