Patent ID: 8295403
Filing Date: 2012-10-23
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; and an open loop frequency correction subsystem connected to the closed loop reference frequency correction module and the frequency generator; wherein the open loop frequency correction subsystem is configured to sample values of the reference frequency adjustment signal during the closed loop mode, add dithering to the sampled values of the reference frequency adjustment signal if there is insufficient inherent loop dithering during sampling in the closed loop mode, and 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 wherein the frequency correction signal is based on an average value of the samples of the reference frequency adjustment signal and the frequency correction signal is generated to have a greater resolution than the reference frequency adjustment signal.