PRF frequency generator for a fill level measuring device

US10295391B2 · kind B2 · utility

Assignee

• Endress+Hauser SE+Co. KG · DE

Inventors

• Rolf Gluth · Neu-Ulm, DE
• Winfried Mayer · Hobrechtsfelde, DE

Key dates

• Filing date: Nov 14, 2014
• Grant date: May 21, 2019
• Expiry date: Nov 25, 2035

Classification

• Technology area (CPC G): Physics
• CPC primary: G01S13/282
• WIPO field: Measurement
• WIPO sector: Instruments

Abstract

The invention relates to a frequency generator for generating two pulse repetition frequency signals with slightly different frequencies for a radar measuring device. The frequency generator comprises an oscillator, which generates an oscillator signal, a first signal path for generating a first pulse repetition frequency signal from the oscillator signal, and a second signal path for generating a second pulse repetition frequency signal from the oscillator signal. The first signal path comprises a frequency divider or a first DDS module which is designed to generate a first frequency signal on the basis of the oscillator signal, a first mixer which is designed to upmix the first frequency signal or a signal derived therefrom to an intermediate frequency band and to generate a first intermediate frequency signal, and a first ceramic bandpass filter which is designed to filter out a selected frequency component of the first intermediate frequency signal and to generate a bandpass-filtered first intermediate frequency signal. The second signal path comprises a second DDS component which is designed to generate a second frequency signal on the basis of the oscillator signal, said seco…