Patent · US Expired

Circuit configuration for tolerance correction in a frequency demodulator

US6985029B2 · kind B2 · utility

1Cited by

2References

16Claims

0Family size

Assignee

Infineon Technologies AG · DE

Inventors

Elmar Wagner · Taufkirchen, DE
Stefan Heinen · Krefeld, DE
Andre Hanke · Mülheim an der Ruhr, DE

Key dates

Filing date	Nov 18, 2002
Grant date	Jan 10, 2006
Priority date	—
Expiry date	Apr 29, 2023

Classification

Technology area (CPC H)Electricity
CPC primaryH03D3/002
WIPO fieldBasic communication processes
WIPO sectorElectrical engineering

Abstract

A demodulator has a resistor and a capacitor that may be subject to tolerances. For tolerance correction, the FM demodulator is preferably supplied with a reference frequency, which corresponds to the nominal mid-frequency of the demodulator, which is a function of the resistor and the capacitor. Any discrepancy between the actual mid-frequency of the demodulator and its nominal mid-frequency leads to the production of a voltage that differs from a nominal voltage at the output. A detector detects this error and adjusts the values of the resistor or capacitor until the error between the nominal voltage and the voltage is zero or is a minimum. The described principle can be used, for example, in integrated mobile radio receivers.

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