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JSSC 2009第10期Data Converters0.35-μm CMOSPipeline ADCNeural Network Accelerator

Nested Digital Background Calibration of a 12-bit Pipelined ADC Without an Input

通过嵌套背景校准技术消除输入SHA的12位流水线ADC,实现低功耗高性能。
12-bit, 20-Msample/s, SNDR 70.2 dB, SFDR 80.3 dB, INL 0.75 LSB
流水线ADC背景校准时序补偿低功耗数字插值
创新点1:嵌套背景校准技术(系统创新) - 通过嵌套架构同时校准流水线ADC和算法ADC,消除了传统输入SHA的需求,降低了23mW功耗,同时保持12位精度(SNDR 70.2dB@58kHz)。
创新点2:数字背景时序补偿(方法创新) - 采用固定系数微分器构建自适应插值器,解决了无SHA导致的采样时序差异问题,使9MHz输入时SFDR仍达78.3dB。
创新点3:自适应插值器设计(电路创新) - 通过数字电路实现动态时序误差补偿,仅需0.1秒(200万样本)即可收敛,相比模拟补偿方案显著提升校准速度。
创新点4:无SHA架构优化(系统创新) - 通过系统级时序管理彻底移除输入SHA,芯片面积缩减至7.5mm²(0.35μm CMOS),实现231mW的低功耗表现。
Abstract
To reduce power dissipation, the input sample-and- hold amplifier (SHA) is eliminated in a pipelined analog-to-digital converter (ADC) with nested background calibration. The nested architecture calibrates the pipelined ADC with an algorithmic ADC that is also calibrated. Without an input SHA, a timing difference between the sampling instants of the two ADCs creates an error that interferes with calibration of the pipelined ADC. This problem is overcome with digital background timing com- pensati