Patent ID: 8724765
Filing Date: 2014-05-13
Classification: H03L

Abstract:
1. A locking system, comprising a digital phase discrimination and conversion unit, a digital loop filter unit and a digital voltage controlled oscillation unit which are connected in turn, wherein, the digital phase discrimination and conversion unit is configured to perform a phase discrimination and conversion process to an input signal F the digital loop filter unit is configured to perform a filtering process to the signal clk and the signal sign, and generate a signal ahead which is used to denote that the frequency of the signal F the digital voltage controlled oscillation unit is configured to perform a voltage controlled oscillation process for the signal ahead and the signal lag which are generated after the filtering process to the signal clk and the signal sign, to implement a locking of the signal F wherein the digital phase discrimination and conversion unit comprises a digital stagger phase discriminator and a conversion module, wherein, the digital stagger phase discriminator is configured to perform a phase discrimination process to the signal F the conversion module is configured to calculate a pulse width of the pulse signal error according to a counting signal count, and generate the signal sign which denotes the frequency size relationship between the signal F wherein the counting signal count is implemented by way of a time interval calculation, and the signal sign denotes the frequency size relationship between the signal F