Patent ID: 8264292
Filing Date: 2012-09-11
Classification: H03L

Abstract:
1. A device capable of compensating for the manufacturing tolerances and the temperature drift of a reference frequency of a silicon-type resonator, generating a programmable compensated reference frequency Fref, comprising: a temperature sensor capable of measuring an operating temperature of said resonator and capable of providing a first signal corresponding to the temperature, a sequencer connected to said temperature sensor, said sequencer being capable of determining a second compensation signal, from the first signal and as a function of said temperature value, using calibration data intended to be stored in a storage means connected to said sequencer, said second signal corresponding to a positive value N, said sequencer being, moreover, capable of determining a third compensation signal, from said first signal and as a function of the temperature value, using calibration data, said third signal corresponding to a ratio between a positive integer S and N, S being less than or equal to N, a variable counter connected to said sequencer and connected to an oscillator provided with said resonator, said variable counter—being capable of receiving said compensation signals, capable of producing a fourth output signal every N periods of a clock signal coming from said resonator, and capable of detecting the state S, arranged to produce a fifth signal capable of modifying the load capacity of said oscillator, wherein N comprises an integer part Nint and a fractional part Nfrac, and in that the variable counter comprises: an accumulator connected to the outlet of the sequencer and capable of receiving a sixth signal corresponding to the fractional part of N, a Nint, Nint+1 dual-module counter connected to the outlet of the accumulator and to the outlet of the sequencer, capable of receiving a seventh signal corresponding to the integer part of N, and whereof the output is the compensated reference frequency Fref, a counting element connected to the outlet of the sequencer and to the outlet of the dual-module counter, capable of receiving said third signal and said fourth signal, said counting element being capable of producing the fifth signal as a function of the state S.