Patent ID: 8248113

Claim:
An apparatus comprising: a clock synthesizer for outputting a first clock in accordance with a first control word during an initial calibration and outputting a second clock in accordance with a combination of a third control word and a fourth control word during a normal operation; a temperature sensor for outputting a second control word representing a temperature of the apparatus; a non-volatile memory for storing and outputting the third control word; a temperature compensated frequency controller for receiving the second control word and the third control word and outputting the fourth control word; and a one-point calibration controller for outputting the first control word, wherein: during the initial calibration, the one-point calibration controller adjusts the first control word until a timing of the first clock is sufficiently accurate with respect to a timing of a reference clock, and upon the first clock being sufficiently accurate the calibration controller stores a present value of the first control word and the second control word into the non-volatile as the third control word; and during the normal operation, the one-point calibration controller is disabled, the non-volatile memory is in a read-only state, and the temperature compensated frequency controller adjusts the fourth control word in response to a change in the second control word.