Frequency-domain ADC flash calibration
US10056914B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Sep 30, 2016 |
| Grant date | Aug 21, 2018 |
| Priority date | — |
| Expiry date | Sep 30, 2036 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03M3/384
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
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.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.