Frequency generator with a phase locked loop

US7218178B2 · kind B2 · utility

Assignee

• Fraunhofer-Gesellschaft zur förderung der angewandten Forschung e.V. · DE

Inventors

• Niels Christoffers · Cambridge, GB
• Rainer Kokozinski · Oberhausen, DE
• Bedrich Hosticka · Rübhausen, DE
• Stephan Kolnsberg · Krefeld, DE

Key dates

• Filing date: Sep 23, 2005
• Grant date: May 15, 2007
• Expiry date: Sep 23, 2025

Classification

• Technology area (CPC H): Electricity
• CPC primary: H03L7/093
• WIPO field: Basic communication processes
• WIPO sector: Electrical engineering

Abstract

A frequency generator with a phase locked loop includes a loop filter, the transfer function of which has a pair of complex conjugated poles. The present invention provides an optimum and greatly improved compromise, in particular as opposed to the prior art, between phase noise and settling time of the phase locked loop of the frequency generator.