Maintaining ratiometric data in electronically manipulated signal processing systems

US5371500A · kind A · utility

Assignee

• DELCO ELECTRONICS CORPORATION · US

Inventors

• Raymond Lippmann · Ann Arbor, US
• James E. Nelson · North Branch, US
• Michael J. Schnars · Clarkston, US
• James R. Chintyan · Davison, US
• Mark C. Hansen · Kokomo, US
• Edward H. Honnigford · Russiaville, US

Key dates

• Filing date: Sep 11, 1992
• Grant date: Dec 6, 1994
• Expiry date: Sep 11, 2012

Classification

• Technology area (CPC H): Electricity
• CPC primary: H03M1/66
• WIPO field: Basic communication processes
• WIPO sector: Electrical engineering

Abstract

A circuit apparatus comprises interface circuitry between analog and digital circuitry. A multiple reference circuit provides a variety of reference voltage signals. The multiple reference circuitry is coupled to a selection circuit that selectively couples one of the reference voltage signals to a first reference input of the interface circuitry and selectively couples another of the reference voltage signals to a second reference input of the interface circuitry, whereby the first and second reference inputs may be selectively coupled to the reference voltages and the circuit maintains a ratiometric relationship between the digital and analog circuitry.