CPC H04B 1/0475 (2013.01) [G06F 1/10 (2013.01); G06F 9/30101 (2013.01); H04B 2001/0491 (2013.01)] | 18 Claims |
1. A digital fingerprint generation circuit, comprising:
a pulse generation sub-circuit configured to generate a plurality of pulse signals;
a digital control oscillator sub-circuit configured to generate an intermediate signal based on a frequency control signal and the plurality of pulse signals;
a frequency dividing sub-circuit configured to divide the intermediate signal in frequency to generate a feedback signal;
a frequency and phase detection sub-circuit configured to generate a digital fingerprint based on an input signal and the feedback signal, and further configured to generate a frequency indication signal indicating whether a frequency of the input signal is larger than a frequency of the feedback signal; and
a control sub-circuit configured to generate the frequency control signal based on the frequency indication signal,
wherein the input signal is a signal generated by a pulse generator, and
wherein the input signal has a frequency not within an operating frequency range of the digital control oscillator sub-circuit.
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