Phase-locked loop with short transient recovery duration and small interference signal component

US6621356B2 · kind B2 · utility

Assignee

• Infineon Technologies AG · DE

Inventors

• Edmund Gotz · Dachau, DE
• Bernd Memmler · Riemerling, DE
• Günter Schönleber · Oestrich-Winkel, DE

Key dates

• Filing date: Mar 27, 2002
• Grant date: Sep 16, 2003
• Expiry date: Mar 27, 2022

Classification

• Technology area (CPC H): Electricity
• CPC primary: H03L7/0898
• WIPO field: Basic communication processes
• WIPO sector: Electrical engineering

Abstract

In order to shorten the transient recovery duration, the phase-locked loop has a voltage-controlled oscillator providing an oscillator signal to a first frequency divider. The first frequency divider divides the frequency of the oscillator signal, generates a first divider output signal therefrom, and passes it to a phase comparator during the transient recovery duration of the phase-locked loop. Furthermore, a unit is provided, which, after the transient recovery duration of the phase-looped loop, divides the frequency of the first divider output signal and passes it to the phase comparator. The phase comparator compares the first divider output signal with a first reference signal during the transient recovery duration. The phase comparator compares the divided divider output signal with a second reference signal after the transient recovery duration. The output of the phase comparator is connected to the voltage-controlled oscillator via a controllable charge pump.