Circuit for conditioning and digitizing an analog signal

US5835041A · kind A · utility

Assignee

• ITT Automotive Europe GmbH · DE

Inventors

• Michael Zydek · Langgöns, DE
• Wolfgang Fey · Niedernhausen, DE
• Adrian Traskov · Steinbachl, DE

Key dates

• Filing date: Jan 9, 1997
• Grant date: Nov 10, 1998
• Expiry date: Jan 9, 2017

Classification

• Technology area (CPC H): Electricity
• CPC primary: H03M3/022
• WIPO field: Transport
• WIPO sector: Mechanical engineering

Abstract

A circuit for conditioning and digitizing an analog input signal that includes a control circuit taking the form of a delta modulator that has a comparator, a clock-controlled flip-flop, a digital accumulator and a digital-to-analog converter. The comparator compares the analog input signal with an adapted signal. The comparator output is conducted to the flip-flop which produces a binary data stream representative of the difference between the comparator inputs. The digital output signal is generated by the accumulator which if fed with an integration constant that is a function of the output signal of the flip-flop. The digital output signal of the accumulator is converted into a square wave signal, which corresponds to the analog input signal, by way of a digital low-pass filter and a threshold value comparator to which the mean value of the digital output signal is supplied as a threshold value.