Calibration configuration

US6946848B2 · kind B2 · utility

Assignee

• Infineon Technologies AG · DE

Inventors

• Andreas Täuber · Unterschleißheim, DE
• Thomas Hein · Hersbruck, DE
• Aaron Nygren · Birkenfeld, DE

Key dates

• Filing date: Sep 29, 2003
• Grant date: Sep 20, 2005
• Expiry date: Feb 28, 2024

Classification

• Technology area (CPC G): Physics
• CPC primary: G01R35/007
• WIPO field: Measurement
• WIPO sector: Instruments

Abstract

A calibration configuration for setting an adjustable impedance has a voltage divider with a variable resistor and a resistor connected in series, which circuit is supplied with potentials of a supply voltage and has, between the resistors, a partial voltage tap off terminal. A circuit has a further resistor, whose value is in a fixed relationship with a resistance of the first voltage divider resistor, and generates a voltage dependent upon a value derived from the further resistor. The voltage and the partial voltage are fed to a comparator for outputting a comparison result to a downstream control logic unit, which logic unit is coupled to the resistor of the first voltage divider and generates a control signal dependent upon the comparator output signal. The control logic unit control signal is used to set the variable resistor until the voltages fed to the comparator correspond to one another.