Importance

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Abstract

A phase-locked loop with reduced settling time, in particular in or for a transceiver circuit of a tire pressure monitoring system, is disclosed, The phase-locked loop includes, sequentially arranged in a signal path, phase comparators for generating a phase difference signal by comparing a reference input signal and an output signal, loop filters for filtering the phase difference signal, and an oscillator controlled by the filtered phase difference signal for generating the output signal. The phase-locked loop has an adapting circuit for reducing the settling time at switch-on of the phase-locked loop, which adapting circuit correlates the actual switch-on of the phase-locked loop with the signal behavior of the reference input signal. A transceiver circuit of a tire pressure monitoring system is also disclosed.

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First Claim