公开(公告)号：US20170179971A1

公开(公告)日：2017-06-22

申请号：US15282586

申请日：2016-09-30

Applicant: ANALOG DEVICES GLOBAL

Inventor： ZHAO LI ,  HAJIME SHIBATA ,  TREVOR CLIFFORD CALDWELL ,  RICHARD E. SCHREIER ,  VICTOR KOZLOV ,  DAVID NELSON ALLDRED ,  PRAWAL MAN SHRESTHA

IPC: H03M1/10 ,  H03M3/00 ,  H03M1/36

CPC classification number: H03M1/1023 ,  H03M1/1004 ,  H03M1/1038 ,  H03M1/1085 ,  H03M1/361 ,  H03M3/378 ,  H03M3/384

Abstract: A flash analog-to-digital converter (ADC) includes comparators that convert an analog input signal to a digital output signal. Offsets of these comparators introduce noise and can hurt the performance of the ADC. Thus, these comparators are calibrated using calibration codes. Conventional calibration methods determine these calibration codes by removing the ADC from an input signal. Otherwise, it is difficult to distinguish the noise from the signal in the calibration measurement. In contrast, an embodiment can determine the calibration codes while the ADC converts the input signal to a digital signal. Such an embodiment can be achieved by a frequency-domain technique. In an embodiment employing a frequency-domain power meter, an input signal can be removed from the power measurement. This removal enables accurate measurement of in-band noise without having the measurement be corrupted by input signal power.