The frequency error of an oscillator is minimized by characterizing the oscillator. A reference signal from an external source containing a minimal frequency error is provided to an electronic device. The external signal is used as a reference frequency to estimate the frequency error of an internal...http://www.google.com.au/patents/US6928275?utm_source=gb-gplus-sharePatent US6928275 - Method and apparatus for compensating local oscillator frequency error
