一种用于铷频标的紧凑型直接数字频率合成器

研发了高精度铷频标芯片SoC实现中应用的一种紧凑型直接数字频率合成器（DDFS) . 为了减小芯片面积和降低功耗，采用正弦对称技术、modified Sunderland 技术、正弦相位差技术、四线逼近技术以及量化和误差ROM技术对相位转正弦的映射数据进行了压缩. 利用这些技术，ROM尺寸压缩了98%. 采用标准0.35μm CMOS工艺，一个具有32位相位存储深度和10位DAC的紧凑型DDFS流片成功,其核心面积为1.6mm2. 在3.3V电源下，该芯片的功耗为167mW, 无杂散动态范围（SFDR）为61dB.

A Compact Direct Digital Frequency Synthesizer for the Rubidium Atomic Frequency Standard

A compact direct digital frequency synthesizer(DDFS)for system-on-chip implementation of the high precision rubidium atomic frequency standard is developed.For small chip size and low power consumption,the phase to sine mapping data is compressed using sine symmetry technique,sine-phase difference technique,quad line approximation technique,and quantization and error read only memory(QE-ROM)technique.The ROM size is reduced by 98% using these techniques.A compact DDFS chip with 32bit phase storage depth and...