Amplifier with reduced sensivity to offset voltages

The method for amplifying an input signal (VIN) which comprises a d.c. component and an a.c. component, includes a comparison of the input signal with a reference value to generate a correction signal (ICOR), the generation of an intermediate signal (IINT) by subtracting the correction signal from t...

Full description

Saved in:
Bibliographic Details
Main Authors LEBAILLY, GUILLAUME, DESBONNETS, ERIC
Format Patent
LanguageEnglish
French
German
Published 08.01.2003
Edition7
Subjects
AMPLIFIERS
BASIC ELECTRONIC CIRCUITRY
CONTROL OF AMPLIFICATION
ELECTRICITY
Online AccessGet full text

Cover

More Information
Summary:The method for amplifying an input signal (VIN) which comprises a d.c. component and an a.c. component, includes a comparison of the input signal with a reference value to generate a correction signal (ICOR), the generation of an intermediate signal (IINT) by subtracting the correction signal from the transformed input signal (IIN), a rectification of the intermediate signal (IINT) producing a rectified intermediate signal (IRED), the evaluation of a mean value (IRECT) of the rectified intermediate signal, and a multiplication of the input signal (VIN) by the mean value (IRECT) to obtain an output signal (VOUT). The value of the correction signal is equal to the reference value for the values of the input signal higher than the reference value, and it is equal to the value of the input signal when the input signal is lower than the reference value. The reference value is selected so to eliminate the parasitic a.c. signals. A device is claimed which amplifies an input signal by implementing the method. L'invention concerne un procédé pour amplifier un signal d'entrée [VIN,IIN] comportant une composante continue et une composante alternative, incluant les étapes suivantes : comparaison [GEN] du signal d'entrée [VIN,IIN] avec une valeur de référence, génération d'un signal intermédiaire [IINT] par soustraction [SUB] au signal d'entrée [VIN,IIN] d'un signal dit de correction [ICOR] résultant de ladite comparaison [GEN], redressement [RED] du signal intermédiaire [IINT], évaluation [MEA] d'une valeur moyenne [IRECT] du signal intermédiaire redressé [IRED], multiplication [GAIN] du signal d'entrée [VIN,IIN] par ladite valeur moyenne [IRECT]. L'invention permet une réduction de la sensibilité de l'amplificateur à la composante continue du signal d'entrée. Application : Amplification de signaux analogiques.
Bibliography:Application Number: EP20020077497