Patent ID: 7463077

Claim:
A device for generating a periodic clock signal, comprising: a bandpass filter, the bandpass filter comprising a bandpass filter input for receiving an input signal and a bandpass filter output for outputting a bandpass filtered signal; and a comparator, the comparator having at least a first comparator input for receiving the bandpass filtered signal and a comparator output for outputting the clock signal, wherein the comparator is configured to output a first signal level at the comparator output, if the bandpass filtered signal exceeds a reference level, and output a second signal level at the comparator output, if the bandpass filtered signal falls below the reference level, wherein the comparator comprises a second comparator input, the second comparator input receiving a signal inverted with respect to the bandpass filtered signal, and the comparator being configured to detect an overshooting or undershooting of the reference level by means of the comparison between the bandpass filtered signal and the inverted bandpass filtered signal.