Device having a voltage-controlled oscillator and a switching arrangement for self-calibration
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Dec 5, 2017
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Dec 5, 2011
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Dec 6, 2010
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Abstract
A device, particularly a radar sensor, has a voltage-controlled oscillator for generating a high-frequency signal which has an actual frequency, a voltage adjusting device to control the oscillator, and a calibration device operable for adjusting a voltage value which is assigned to a value of a target frequency. The calibration device is operable for finding a difference between a frequency and the target frequency corresponding to the voltage set at the oscillator. The calibration device is also operable for generating a low-frequency signal from the high-frequency signal, determining the oscillation period of the low-frequency signal, calculating an auxiliary frequency from the oscillation period of the low-frequency signal, wherein the auxiliary frequency corresponds to the actual frequency of the high-frequency signal, and for adjusting the voltage value assigned to the target frequency according to the frequency difference between the auxiliary frequency and the target frequency.
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