Patent · US Expired

Digital control circuit for tuning systems with a pulse density modulation digital to analog converter

US5059979A · kind A · utility

21Cited by

12References

27Claims

0Family size

Assignee

Deutsche ITT Industries, GmbH · DE

Inventors

Ljubomir Micic · Glückstadt, DE
Daniel Mlynek · Heimbach, DE
Ulrich Sieben · Meßkirch, DE
Klaus Heberle · Meßkirch, DE

Key dates

Filing date	Jun 15, 1990
Grant date	Oct 22, 1991
Priority date	—
Expiry date	Jun 15, 2010

Classification

Technology area (CPC H)Electricity
CPC primaryH03L7/189
WIPO fieldBasic communication processes
WIPO sectorElectrical engineering

Abstract

A digital control circuit with a device for generating a high-resolution tuning voltage is suitable for use in receivers for RF signals, particularly in consumer equipment. The tuning voltage can be electronically switched from one value to another at a high speed. The transient time required with conventional control loops is nearly eliminated since the low-pass filter or the digital integrator is preset to its steady-state integration value. To generate the tuning voltage, dynamic digital-to-analog convertors are provided which, despite their high resolution, require only a smoothing filter with a short response time and a short time constant.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.