Patent · US Expired

PLL circuit modulatable by a modulation signal having a direct current component

US5461348A · kind A · utility

2Cited by

3References

5Claims

0Family size

Assignee

Fraunhofer-Gesellschaft zur förderung der angewandten Forschung e.V. · DE

Inventors

Albert Heuberger · Erlangen, DE
Ludwig Wallrapp · Erlangen, DE
Dieter Seitzer · Erlangen, DE

Key dates

Filing date	Oct 27, 1994
Grant date	Oct 24, 1995
Priority date	—
Expiry date	Oct 27, 2014

Classification

Technology area (CPC H)Electricity
CPC primaryH03C2200/0075
WIPO fieldBasic communication processes
WIPO sectorElectrical engineering

Abstract

A PLL circuit modulatable by a modulation signal having a direct current component has a voltage-controlled main oscillator, a loop divider, a phase comparator and a loop filter. The reference frequency signal for the phase comparator is derived from the modulation signal by a first compensation filter, a voltage-controlled reference oscillator and a reference divider being connected downstream of said first compensation filter. The voltage-controlled main oscillator is controlled by the modulation signal via a second compensation filter followed by a downstream data lowpass.

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