Patent ID: 6885254

Claim:
A calibration device for generating a clock in an integrated circuit, comprising: a device for generating clock signals disposed in the integrated circuit, said device generating both an internal clock and a target clock, said device for generating clock signals containing a local oscillator disposed in the integrated circuit, said local oscillator generating both the internal clock and the target clock, the internal clock being identical to the target clock; a reference oscillator having selectably an active state and a passive state, said reference oscillator supplying a reference clock in the active state; and a calibration circuit connected to said device and said reference oscillator and receiving the internal clock and the reference clock, said calibration circuit determining a clock ratio between the internal clock and the reference clock; said device for generating clock signals having means for influencing the target clock in dependence on the clock ratio determined by said calibration circuit, said means for influencing the target clock coupled to said calibration circuit.