Phase-locked loop
First Claim
1. A phase-locked loop having a reduced settling time for a transceiver circuit of a tire pressure monitoring system, the phase-locked loop comprising:
- a phase comparator for generating a phase difference signal by comparing a reference input signal with an output signal;
a loop filter for filtering the phase difference signal;
an oscillator controlled by the filtered phase difference signal for generating the output signal; and
an adapting circuit for reducing the settling time at switch-on of the phase-locked loop, the adapting circuit correlating the actual switch-on of the phase-locked loop with the signal behavior of the reference input signal, wherein the phase comparator, the loop filter, the oscillator and the adapting circuit are sequentially arranged in a signal path.
2 Assignments
0 Petitions
Accused Products
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.
12 Citations
22 Claims
-
1. A phase-locked loop having a reduced settling time for a transceiver circuit of a tire pressure monitoring system, the phase-locked loop comprising:
-
a phase comparator for generating a phase difference signal by comparing a reference input signal with an output signal;
a loop filter for filtering the phase difference signal;
an oscillator controlled by the filtered phase difference signal for generating the output signal; and
an adapting circuit for reducing the settling time at switch-on of the phase-locked loop, the adapting circuit correlating the actual switch-on of the phase-locked loop with the signal behavior of the reference input signal, wherein the phase comparator, the loop filter, the oscillator and the adapting circuit are sequentially arranged in a signal path. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19)
-
-
20. A transceiver circuit of a tire pressure monitoring system, the circuit comprising:
-
a device for generating and/or synchronizing a clock signal; and
a phase-locked loop in order to set up short-term data communication with another transceiver circuit of the same tire pressure monitoring system during operation thereof, wherein the phase-locked loop comprises;
a phase comparator for generating a phase difference signal by comparing a reference input signal with an output signal;
a loop-filter for filtering the phase difference signal;
an oscillator controlled by the filtered phase difference signal for generating the output signal; and
an adapting circuit for reducing the settling time at switch-on of the phase-locked loop, the adapting circuit correlating the actual switch-on of the phase-locked loop with the signal behavior of the reference input signal, wherein the phase comparator, the loop filter, the oscillator and the adapting circuit are sequentially arranged in a signal path. - View Dependent Claims (21, 22)
-
Specification