公开(公告)号：US20040113665A1

公开(公告)日：2004-06-17

申请号：US10688208

申请日：2003-10-17

Applicant: STMicroelectronics SA

Inventor： Loic Joet ,  Sebastien Dedieu ,  Eric Andre ,  Daniel Saias

IPC: H03L007/06

CPC classification number: H03L7/087 ,  H03L7/0891 ,  H03L7/183 ,  H03L7/199 ,  H03L2207/18

Abstract: A method for generating a signal with a frequency equal to a product of a reference frequency and a real number includes providing an output signal from an oscillator, and performing a first integer division of a frequency of the output signal by a first integer divider to obtain a first intermediate signal. A first measurement signal representative of a time difference between the first intermediate signal and a reference signal having the reference frequency is determined. The method further includes generating a first comparison signal derived from the first measurement signal, and generating a second comparison signal dependent on a period of the reference signal, on integer and decimal parts of the real number and on the first integer divider. The first and second comparison signals are compared to obtain an error signal representative of a time difference between a period of a current output signal and the period of the reference signal. The first integer division is deactivated to deliver an error signal to the input of the oscillator, with the output signal from the oscillator forming the desired signal with a frequency equal to the product of the reference frequency and the real number.

Abstract translation: 用于产生频率等于参考频率和实数的乘积的信号的方法包括提供来自振荡器的输出信号，以及通过第一整数分频器对输出信号的频率进行第一整数除法以获得 第一中间信号。 确定代表第一中间信号和具有参考频率的参考信号之间的时间差的第一测量信号。 该方法还包括生成从第一测量信号导出的第一比较信号，以及根据参考信号的周期，在实数的整数和小数部分以及第一整数分频器上产生第二比较信号。 比较第一和第二比较信号以获得表示当前输出信号的周期与参考信号周期之间的时间差的误差信号。 第一个整数除法被去激活以向振荡器的输入端发送一个误差信号，来自振荡器的输出信号形成期望的信号，其频率等于参考频率和实数的乘积。