Patent ID: 7791419
Filing Date: 2010-09-07
Classification: H03L,H04J,H04W,Y02D

Abstract:
1. A device for timing events comprising: a first oscillator including an output, the first oscillator including a mechanically resonant element; a second oscillator including an output, the second oscillator including a quartz resonator, wherein the second oscillator has a temperature characteristic; a frequency relater having an output, a first input, and a second input, the frequency relater having the first input coupled to the first oscillator output and the second input coupled to the second oscillator output, wherein the output of the frequency relater provides a quantity corresponding to a frequency relation between a first oscillator frequency and a second oscillator frequency, and wherein an estimate of the first oscillator frequency is based at least in part on the first oscillator, the second oscillator, and the frequency relater; and a temperature measurement circuit having a temperature measurement output, wherein the temperature measurement output and the temperature characteristic of the second oscillator are used to improve the estimate of the first oscillator frequency.