Importance

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Abstract

In one embodiment a tracking circuit for tracking a frequency of a sweeping signal component in an input signal comprises an input (9) for receiving the input signal (Sin) comprising the sweeping signal component and a noise component, a mixer (10) coupled to the input and configured to mix the input signal (Sin) with a replica signal (Srep) and therefrom provide a residual input signal (Sinr), a low-pass filter (20) coupled downstream of the mixer (10), a discriminator circuit (30) coupled downstream of the low-pass filter (20), a loop filter (40) coupled downstream of the discriminator circuit (30) and configured to provide a frequency control value (Sfc), and a replica signal generator circuit (50) coupled downstream of the loop filter (40) and configured to provide the replica signal (Srep) with a frequency adjusted based on the frequency control value (Sfc), wherein the frequency of the replica signal (Srep) represents an estimation of a frequency of the sweeping signal component propagated to a current time unit of the input signal (Sin).

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First Claim