Telefonaktiebolaget Lm Ericsson (publ)

Anthony Chak Keung Soong

Bruce S Schwartz

David Purdy

Kate Jennings Lainson

An oscillating circuit ( ) includes a quartz crystal oscillator ( ) for generating a clock signal ( ). The clock signal is synchronized to a master signal ( ) during the lock-in periods when the oscillating circuit ( ) has access to the master signal ( ). During the holdover periods when the oscillating circuit ( ) loses access to the master signal ( ), an oscillation frequency function predicts the crystal oscillation frequency in terms the physical parameters, e.g., time and temperature, that may affect the crystal oscillation frequency. The predicted frequency is compared with a standard frequency to generate an error signal. In response to the error signal, a fraction handler block ( ) determines whether adding cycles to or deleting cycles from the clock signal, thereby calibrating the oscillation signal ( ) of the oscillating circuit ( ).

Growing community of inventors

Superior, CO, United States of America

Anthony Chak Keung Soong