Patent ID: 11942959
Assignee: INFINEON TECHNOLOGIES AG
Field: Basic communication processes (Electrical engineering)
Classification: CPC H | IPC H

Claim 0:
1. A calibration circuit for calibrating an Analog-to-Digital Converter (ADC), comprising:
a processor configured to generate a digital input word during a calibration;
a signal generator circuit connected to the processor, the signal generator circuit being configured to generate a modulated analog input signal, which is based on the digital input word that is modulated;
the ADC, which is configured to convert an analog reference signal to a digital calibration word, wherein the analog reference signal is a low-pass-filtered version of the analog input signal generated by the signal generator circuit; and
a feedback circuit configured to output a digital feedback signal to the processor, the digital feedback signal being based on a modulated version of the analog reference signal, and
wherein the signal generator circuit, the ADC, and the feedback circuit are provided on a same chip, and
wherein the processor is further configured to, after the calibration, generate using the ADC the digital input word based on an analog signal while compensating for non-linear errors in the ADC using the digital calibration word.