US 11,942,959 B2
Calibration with feedback sensing
Mihail Jefremow, Augsburg (DE); Stefan Koeck, Ottenhofen (DE); Ralph Mueller-Eschenbach, Munich (DE); Juergen Schaefer, Oberhaching (DE); Arndt Voigtlaender, Ottobrunn (DE); and David Zipperstein, Munich (DE)
Assigned to Infineon Technologies AG, Neubiberg (DE)
Filed by Infineon Technologies AG, Neubiberg (DE)
Filed on Sep. 28, 2021, as Appl. No. 17/487,199.
Prior Publication US 2023/0106703 A1, Apr. 6, 2023
Int. Cl. H03M 1/20 (2006.01); H03M 1/06 (2006.01); H03M 1/10 (2006.01); H03M 3/00 (2006.01)
CPC H03M 1/1014 (2013.01) [H03M 1/0626 (2013.01); H03M 3/464 (2013.01)] 23 Claims
OG exemplary drawing
 
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.