低功耗格雷码计数器ASlC设计

摘要

A Low-power,High-reliability chip is designed as a Gray code counter working in industrial rotary encoder system.The methods of multi-level quiescence and clock gating provide a battery life of 5~10 years,with an average power consumption lower than 30μA.Clock calibration and code distance filter are applied to deal with the frequency drift of RC clock and Gray code instability,respectively.Though designed under 0.25μm,2.5V process,the use of dual-edge triggered register,instead of standard DFF,makes the circuit also suitable for 1.8V power supply voltage.%针对工业用旋转编码器圈数计量需求，设计了一种低功耗、高可靠性的格雷码计数器芯片。采用多级休眠唤醒模式配合时钟门控，保证平均工作功耗小于30μA，电池供电续航5～10年。针对RC时钟频率漂移，格雷码信号不稳定等问题，引入了时钟校准和码距滤波方式加以解决，增强了系统的可靠性。采用双时钟沿触发寄存器取代标准D触发器的设计，保证了0．25μm 2．5V工艺电路，在1．8V供电条件下也可正常工作。