摘要
实现了一种适合手持式设备应用的8bit模数(A/D)转换器,该A/D转换器采用了2级电容插值和斩波放大技术以降低正常工作模式功耗,流水放大和预平衡比较器技术有效地提高了采样频率。测试结果表明,该流水插值A/D转换器的微分非线性(DNL)和积分非线性(INL)分别为-1~1.63LSB和-1.66~2.05LSB,其总谐波失真(THD)、去除寄生动态范围(SFDR)和信噪加失真比(SNDR)分别为-43dB、54dB和36.7dB,正常工作模式和等待模式功耗分别为76mW和5mW。该芯片采用中芯国际(SMIC)0.18μm单层多晶六层金属混合CMOS工艺,芯片面积为1269μm×885μm。
An 8 bit analog-to-digital (A/D) converter suitable for portable applications is presented. The capacitive interpolation and chopper amplifier technique have been adopted to reduce the power dissipation of normal work mode. The pipeline chopper amplifier and pre-equalized comparator increase the sampling rate effectively. Measurement result shows the pipeline interpolating A/D converter achieves a differential nonlinearity (DNL) and integral nonlinearity (INL) of - 1-1.63LSB and - 1.66-2. 05LSB respectively, the total harmonic distortion (THD), spurious free dynamic range (SFDR) and signal-to-noise plus distortion ratio (SNDR) are -43 dB,54 dB and 36. 7 dB. The total power dissipation of normal work mode and standby mode are 76 mW and 5 mW respectively. The A/D converter is designed by using SMIC 0. 18 μm 1-poly-6-metal mix-signal CMOS process with the chip area of 1269 μm×885μm.
出处
《电子器件》
CAS
2008年第4期1187-1190,共4页
Chinese Journal of Electron Devices
基金
科技部中小企业创新基金资数项目(05C26212300404)
关键词
容性插值
流水斩波放大器
预平衡比较器
A/D转换器
Capacitive interpolation
pipeline chopper amplifier
pre-equalized comparator
A/D converter