Tracking circuit for tracking a frequency of a sweeping signal component in an input signal, filter circuit and method for processing a sweeping signal component in an input signal

A tracking circuit for tracking a frequency of a sweeping signal component in an input signal, the tracking circuit comprising

• an input for receiving the input signal comprising the sweeping signal component and a noise component,
• a mixer coupled to the input and configured to mix the input signal with a replica signal and therefrom provide a residual input signal,
• a low-pass filter coupled downstream of the mixer and configured to reduce the noise component from the residual input signal and therefrom provide a filtered input signal,
• a discriminator circuit coupled downstream of the low-pass filter and configured to estimate a frequency error of the filtered input signal and accordingly provide an error signal,
• a loop filter coupled downstream of the discriminator circuit and configured to provide a frequency control value based on the error signal,
• a replica signal generator circuit coupled downstream of the loop filter and configured to provide the replica signal with a frequency adjusted based on the frequency control value, wherein the frequency of the replica signal represents an estimation of a frequency of the sweeping signal component propagated to a current time unit of the input signal.