Verfahren zum Betrieb einer Differenzverstärkeranordnung, Entsprechender Differenzverstärker, Integrierte Schaltung und System

Details

Veröffentlichungs-Nr.

EP4738703

Anmeldetag

10. Oktober 2025

Veröffentlichung

6. Mai 2026

Rechtsraum

EP

IPC

H03F3/45

Abstract

A method of operating an amplifier circuit configured to provide an output signal at an output node based on an amplifier offset and at least one input signal received at input nodes of the amplifier circuit. The amplifier circuit further comprises at least one adjustment node configured to receive at least one adjustment signal. The method comprises, during a calibration phase of the amplifier circuit: selectively coupling the input nodes to a common calibration node and applying (110, 111) a common calibration voltage level thereto; iteratively varying (112, 114) the at least one adjustment signal based on a programmable control code (W) and applying the at least one varied adjustment signal to the at least one adjustment node; sensing the calibration output voltage produced at each iteration of the operation (112, 114) of varying the at least one adjustment signal and performing at least one comparison (116) among a i-th calibration output voltage provided by the amplifier and an (i+1)-th calibration output voltage; based at least on the comparison, checking (118) whether the (i+1)-th calibration output voltage has a polarity different from a polarity of the i-th calibration output voltage, and storing (119) the programmed value (W1) of the programmable control code (W) based on the positive result of the checking operation (118). The method further comprises, during an operating phase of the amplifier circuit: producing the at least one adjustment signal based on the stored (119) value (W1) of the control code (W) and applying the at least one produced adjustment signal to the at least one adjustment node as a result, and selectively decoupling the input nodes of the amplifier circuit from the common calibration node and applying at least one input signal to the input nodes of the amplifier circuit, providing an output signal at the output node of the amplifier circuit exempt from the amplifier offset as a result.

Anmelder

Firma

STMicroelectronics International N.V.

Land

🇨🇭 Schweiz