一种提高锁相环抖动测量精度的方法

A New Method for Improving Accuracy of PLL Jitter Measurement

根据高速、高精度锁相环抖动测量的需要,提出了一种对抖动线性放大的方法。这种方法将ps级的抖动放大为一定脉宽的脉冲信号,然后再通过一些简单的测试电路,对放大后的脉冲信号进行测量。由于对原来的微小抖动进行了线性放大,从而极大地提高了抖动测量的精度。基于0.8μm CMOS工艺,采用MOSFET LEVEL=2模型,对结论进行了SPICE仿真验证。

A method to amplify the small jitter linearly is presented, which makes the jitter much easier tor measurement. After amplification of the jitter, a corresponding pulse is transfered. As a result, the measurement accuracy is greatly improved. This method also provides a reference for measurement of high speed PLL＇ s. The results are verified using SPICE simulation based on 0.8μm CMOS process and MOSFET LEVEL=2 model.