公开(公告)号：US11239851B2

公开(公告)日：2022-02-01

申请号：US16997975

申请日：2020-08-20

Applicant: TEXAS INSTRUMENTS INCORPORATED

Inventor： Srinivas Kumar Reddy Naru ,  Anand Jerry George ,  Shagun Dusad ,  Visvesvaraya Appala Pentakota

IPC: H03M1/00 ,  H03M1/06 ,  H03M1/12 ,  H03M1/46 ,  H03M1/10 ,  H03M1/18

Abstract: A system has a digital-to-analog converter; a reference signal coupled to the digital-to-analog converter; a differential amplifier for applying gain, and for generating output signals as a function of sampled input signals, the reference signal, digital codes, and the gain applied by the differential amplifier coupled to the digital-to-analog converter; and a multi-bit successive-approximation register for determining the digital codes in successive stages coupled to the differential amplifier; and the gain applied by the differential amplifier is corrected based on previously determined digital codes.

公开(公告)号：US10790841B2

公开(公告)日：2020-09-29

申请号：US16221323

申请日：2018-12-14

Applicant: TEXAS INSTRUMENTS INCORPORATED

Inventor： Srinivas Kumar Reddy Naru ,  Anand Jerry George ,  Shagun Dusad ,  Visvesvaraya Appala Pentakota

IPC: H03M1/00 ,  H03M1/06 ,  H03M1/12 ,  H03M1/46 ,  H03M1/10 ,  H03M1/18

Abstract: A system has a digital-to-analog converter; a reference signal coupled to the digital-to-analog converter; a differential amplifier for applying gain, and for generating output signals as a function of sampled input signals, the reference signal, digital codes, and the gain applied by the differential amplifier coupled to the digital-to-analog converter; and a multi-bit successive-approximation register for determining the digital codes in successive stages coupled to the differential amplifier; and the gain applied by the differential amplifier is corrected based on previously determined digital codes.

公开(公告)号：US10484001B1

公开(公告)日：2019-11-19

申请号：US16221464

申请日：2018-12-15

Applicant: TEXAS INSTRUMENTS INCORPORATED

Inventor： Rishi Soundararajan ,  Visvesvaraya Pentakota ,  Anand Jerry George

IPC: H03M1/46 ,  H03M1/68 ,  H03M1/12 ,  H03M1/06

Abstract: A system for digitizing a sampled input value includes a digital-to-analog converter for generating an output signal as a function of (1) the sampled input value, (2) a reference value, and (3) digital codes, and a multi-bit analog-to-digital converter for determining the digital codes in first, intermediate, and subsequent cycles. Dither is dynamically added to the digital-to-analog converter in the intermediate cycle. The dither is corrected for in the subsequent cycle.

公开(公告)号：US10038453B1

公开(公告)日：2018-07-31

申请号：US15792924

申请日：2017-10-25

Applicant: TEXAS INSTRUMENTS INCORPORATED

Inventor： Anand Jerry George ,  Rishi Soundararajan ,  Visvesvaraya Pentakota

IPC: H03M1/10 ,  H03M1/06 ,  H03M1/80 ,  H03M1/68 ,  H03M1/46

CPC classification number: H03M1/1061 ,  H03M1/0604 ,  H03M1/468 ,  H03M1/68 ,  H03M1/802 ,  H03M1/804

Abstract: An analog-to-digital converter includes a comparator, a capacitive digital-to-analog converter (DAC), and calibration circuitry. The capacitive DAC is coupled to the comparator, and includes a plurality of capacitors. The calibration circuitry is configured to adjust a value of each of the capacitors, and includes binary search circuitry and error correction circuitry. The binary search circuitry applies a binary search over a first number of bits of a multi-bit adjustment value used to adjust the value of one of the capacitors, and averages a first number of comparator output samples to determine each of the first number of bits. The error correction circuitry applies an error correction to the multi-bit adjustment value generated by the binary search, and averages a second number of comparator output samples for the error correction. The second number of comparator output samples is greater than the first number of comparator output samples.