Apparatus and method for spectrally shaping a reference clock signal

US7379005B2 · kind B2 · utility

Assignee

• Infineon Technologies AG · DE

Inventors

• Andreas Wiesbauer · Powirtschach, AT
• Luis Hernandez · Madrid, ES
• Dietmar Straussnigg · Villach, AT
• Daniel Gruber · St. Pölten, AT
• Richard Gaggl · Pörtschach am Wörther See, AT
• Martin Clara · Villach, AT
• Stefan Matschitsch · Fürstenfeld, AT

Key dates

• Filing date: Sep 6, 2006
• Grant date: May 27, 2008
• Expiry date: Sep 6, 2026

Classification

• Technology area (CPC H): Electricity
• CPC primary: H03M3/464
• WIPO field: Basic communication processes
• WIPO sector: Electrical engineering

Abstract

Clock signal jitter detection circuit for detecting a clock signal jitter in a reference clock signal (CLK), having a switched-capacitor reference digital-analogue converter (15) which is clocked by the reference clock signal (CLK) and which converts a digital input signal into a first current, a current-controlled digital-analogue converter (16) which is clocked by the reference clock signal (CLK) and which converts the digital input signal into a second current, and having a current integrator (18) which integrates the difference between the first current and the second current to produce a signal which indicates the clock signal jitter in the reference clock signal (CLK).