Clock generator for generating a system clock causing minimal electromagnetic interference

US5699005A · kind A · utility

Assignee

• Deutsche ITT Industries, GmbH · DE

Inventors

• Andreas Menkhoff · Oberhaching, DE
• Ulrich Theus · Gundelfingen, DE

Key dates

• Filing date: Nov 27, 1995
• Grant date: Dec 16, 1997
• Expiry date: Nov 27, 2015

Classification

• Technology area (CPC H): Electricity
• CPC primary: H04B2215/067
• WIPO field: Basic communication processes
• WIPO sector: Electrical engineering

Abstract

A clock generator circuit for clock controlled electronic devices, which causes minimal electromagnetic interference in adjacent electronic equipment. The clock generator circuit includes a clock source for generating a basic clock signal having a predetermined frequency. The basic clock signal defines a reference clock signal having a period T. A phase modulator coupled to the clock source for producing a system clock signal by delaying the basic clock signal. A signal source coupled to the phase modulator, which controls the phase modulator so that the system clock signal is delayed with respect to the reference clock signal by a time period less than half of the period T of the reference clock signal.