Calibration device and method for generating a clock in an integrated circuit
First Claim
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1. 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;
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.
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Abstract
To generate an accurate frequency standard in an integrated circuit, it is proposed to activate a reference oscillator at certain time intervals and to calibrate the local oscillator. For this purpose, a calibration circuit is provided, which determines the clock ratio between the internal clock and the reference clock. The clock ratio determined is used for programming a frequency divider. The calibration circuit is particularly suitable for being used in mobile radio devices.
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Citations
20 Claims
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1. A calibration device for generating a clock in an integrated circuit, comprising:
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a device for generating clock signals disposed in the integrated circuit, said device generating both an internal clock and a 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. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14)
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15. A device for transmitting and receiving data, comprising:
a calibration device, containing;
a device for generating clock signals disposed in the integrated circuit, said device generating both an internal clock and a 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.
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16. A calibration method for generating a clock in an integrated circuit, the integrated circuit containing a device for generating clock signals including an internal clock and a target clock, which method comprises the steps of:
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changing a reference oscillator from a passive state into an active state, the reference oscillator supplying a reference clock to the integrated circuit in the active state;
determining a clock ratio between the internal clock and the reference clock; and
influencing the target clock in dependence on the clock ratio between the internal clock and the reference clock. - View Dependent Claims (17, 18, 19, 20)
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Specification