一种快速捕获、带宽可调的锁相环电路  

A Fast Acquisition PLL with Tunable Loop Bandwidth

作　　者：方盛[1] 秦希[1] 蒋俊[1] 易婷[1] 洪志良[1] 

机构地区：[1]复旦大学专用集成电路与系统国家重点实验室,上海201203

出　　处：《固体电子学研究与进展》2009年第4期556-560,565,共6页Research & Progress of SSE

基　　金：国家自然科学基金项目(60876021)

摘　　要：设计实现了一个快速捕获,带宽可调的电荷泵型锁相环电路。采用了一种利用状态机拓展鉴频鉴相器检测范围的方法,加快了环路的锁定;通过SPI总线实现电荷泵电流配置和调整VCO延时单元的延迟时间,优化了电路性能。芯片采用中芯国际0.18μmCMOS工艺,测试结果表明,锁相环锁定在100MHz时的抖动均方值为24ps,偏离中心频率1MHz处的相位噪声为-98.62dBc/Hz。A fast acquisition charge pump phase-locked loop with tunable loop bandwidth is presented in this paper. A state machine is employed to extend the detection range of the phase frequency detector, which reduces cycle slipping of the control voltage. Functions such as config- uring the current of charge pump, adjusting the delay time of each stage in VCO, can be perf- ormed by using the SPI bus. The chip is implemented in SMIC 0. 18 μm CMOS technology. The measurement results show that the RMS jitter is 24 ps, and the phase noise is -98. 62 dBc/Hz at 1 MHz offset when PLL is locked on 100 MHz.

关 键 词：鉴频鉴相器 检测范围 电荷泵 压控振荡器 

分 类 号：TN431[电子电信—微电子学与固体电子学]