Back to results
US 9,960,778 B2Granted
Semiconductor device
AssigneeRenesas Electronics Corporation
InventorsKeisuke Kimura, Yuichi Okuda, Hideo Nakane, Takaya Yamamoto
Life of this patent
Estimating the term…
Abstract
A semiconductor device according to an aspect of the invention relates to an AD converter that converts a signal level of an analog signal into a digital value by using a comparator, and determines an amount of adjustment of an offset voltage of the comparator based on an offset determination result of the comparator obtained immediately after a least significant bit (LSB) of a digital value output as a conversion result is converted.
Claims10
A semiconductor device comprising:
- a sample-and-hold circuit which samples voltage levels of an input differential signal and outputs a first and a second comparison lines;
- a digital-to-analog conversion circuit which is connected to the first and the second comparison lines;
- a comparator which compares voltage levels of the first and the second comparison lines;
- a successive approximation control circuit which controls the digital-to-analog conversion circuit according to an output signal of the comparator;
- and
- a switch which is connected between the first and second comparison lines,
- wherein the successive approximation control circuit turns on the switch and outputs an offset determination signal for adjusting an input offset voltage of the comparator, and
- wherein, in a conversion cycle of an analog-to-digital conversion, after a least significant bit of the analog-to-digital conversion is determined, an offset control value of the offset determination signal is determined and a subsequent conversion cycle to the conversion cycle is started.
5 more elements
Dependencies are inferred from the claim text.