用于电荷域ADC的大摆幅电荷传输电路设计

Design of a Large-Swing Charge Transfer Circuit for Charge-Domain Analog-to-Digital Converter

提出了一种用于高速电荷域流水线模数转换器(Analog-to-Digital Converter,ADC)中的高精度大摆幅电荷传输电路,采用栅压自举技术,克服了现有电荷传输电路中信号摆幅受限的问题。基于该技术,采用0.18μm CMOS工艺,设计并实现了一款14位200 MS/s电荷域流水线ADC。在189.9 MHz信号输入和全采样率条件下,信噪比为61.7 d BFS,无杂散动态范围为72.6 d Bc;在1.8 V供电下,ADC整体功耗仅为102 m W。

A high-precision large-swing charge transfer circuit for high-speed charge-domain pipelined analog-to-digital converter(ADC)is proposed.The gate voltage bootstrap technology is adopted to overcome the limitation of the signal swing in the existing charge transfer circuit.With the proposed charge transfer circuit,a 14-bit 200 MS/s charge-domain pipelined ADC is designed and implemented in 0.18μm CMOS process.The implemented ADC achieves 61.7 d BFS signal to noise ratio and 72.6 d Bc spurious free dynamic range for a 189.9 MHz input signal at full sampling rate.The overall ADC power consumption is only 102 m W at 1.8 V supply.