Patent ID: 8477878
Filing Date: 2013-07-02
Classification: H03J,H03L,H04L

Abstract:
1. A communications subsystem for a wireless device for correcting errors in a reference frequency signal, the communications subsystem comprising: a frequency generator for generating the reference frequency signal; a closed loop reference frequency correction module connected to the frequency generator for generating a reference frequency adjustment signal to correct the reference frequency signal when the communications subsystem operates in closed loop mode; an open loop frequency correction subsystem connected to the closed loop reference frequency correction module and the frequency generator, the open loop frequency correction subsystem being configured to sample values of the reference frequency adjustment signal during the closed loop mode and to generate a frequency correction signal to correct the reference frequency signal when the communications subsystem operates in another mode other than closed loop mode; and a plurality of storage modules configured to store values for the reference frequency adjustment signal, wherein each storage module is indexed by operating temperature, wherein the communications subsystem is further configured to sample operating temperature and generate the reference frequency signal based on stored values corresponding to the sampled operating temperature.