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Pll

A technology of phase-locked loop and phase difference, applied in the field of phase-locked loop

Inactive Publication Date: 2007-05-30
ATMEL GERMANY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Thus especially in such cases the tire pressure control system no longer works properly

Method used

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Experimental program
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Embodiment Construction

[0059] In these figures, elements and signals that are the same or have the same function are marked with the same reference symbols unless otherwise specified.

[0060] Figure 1 shows a block diagram of a general embodiment of a phase locked loop according to the invention. The phase-locked loop 10 is identified here with the reference symbol 10 . The phase-locked loop has a reference input 11, into which a reference input signal XREF can be coupled; and an output, from which an output signal XVCO can be extracted. A phase comparator 13 , a loop filter 14 and an oscillator 15 are sequentially arranged between the input terminal 11 and the output terminal 12 . A feedback channel 16 is also provided, via which output signal XVCO can be extracted and coupled into the input of phase comparator 13 .

[0061] The phase-locked loop 10 according to the invention also has a further input 17 via which, for example, a digital trigger signal XEN can be coupled. A control device 18 is ...

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PUM

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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.

Description

technical field [0001] The invention relates to a phase-locked loop of the type stated in the preamble of claim 1, in particular a phase-locked loop in or for use in a transceiver circuit of a tire pressure control system, with phase comparators arranged in succession to obtain from a reference The input signal and the output signal generate a phase difference signal; the loop filter is used to filter the phase difference signal; and the oscillator controlled by the filtered phase difference signal is used to generate an output signal. The invention also relates to the transceiver circuit of the tire pressure control system. Background technique [0002] A phase-locked loop (PLL, the English abbreviation for phase-locked loop) has been widely used in electronic circuits to generate and synchronize clock signals, such as clock signals in microelectronic circuits. Such phase-locked loops are generally known in many different embodiments and variants. Just for the basic struc...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H03L7/08H03L7/081H04L7/00B60C23/00B60C23/02
CPCH03L7/10H03L7/095H03L7/087
Inventor 亚历山大·邱尔潘诺夫
Owner ATMEL GERMANY