公开(公告)号：US07167685B2

公开(公告)日：2007-01-23

申请号：US10883641

申请日：2004-06-30

Applicant: Ralf Kakerow ,  Markus Müller ,  Stephan Böcker

Inventor： Ralf Kakerow ,  Markus Müller ,  Stephan Böcker

IPC: H04B1/40 ,  H04B1/18 ,  H04B15/00 ,  H04B1/06

CPC classification number: H03L7/1976 ,  H03K23/667

Abstract: The invention relates to a method of operating a frequency divider. The frequency divider includes a plurality of divider cells arranged in a chain. Each divider cell is adapted to divide a frequency of an input signal with one of two enabled division ratios in accordance with an applied division ratio control signal, and each divider cell but the last is adapted to provide a frequency divided signal as an input signal for a respective next divider cell. In order to enable a Fractional-N division, the method comprises receiving and buffering a new division ratio control signal for each of the divider cells, and synchronizing an application of the buffered division ratio control signals to the divider cells with a status of a current division cycle. The invention relates equally to a corresponding frequency divider, PLL frequency synthesizer, RF front end, device and system.

Abstract translation: 本发明涉及一种操作分频器的方法。 分频器包括布置在链中的多个分频单元。 每个分频器单元适于根据所施加的分频比控制信号将输入信号的频率与两个使能的分频比之一分开，并且每个分频器单元而最后一个分频单元适于提供分频信号作为输入信号 相应的下一个分频器单元。 为了实现分数N分频，该方法包括接收和缓冲每个分频器单元的新的分频比控制信号，并将缓冲的分频比控制信号的应用与具有当前状态的分频器单元同步 分割周期。 本发明同样涉及相应的分频器，PLL频率合成器，RF前端，器件和系统。