公开(公告)号：US20200252073A1

公开(公告)日：2020-08-06

申请号：US16854077

申请日：2020-04-21

Applicant: TEXAS INSTRUMENTS INCORPORATED

Inventor： Atul Kumar AGRAWAL ,  Gautam Salil NANDI ,  Siddharth MALHOTRA ,  Tanmay NEEMA

IPC: H03M1/10

Abstract: An integrated circuit includes a digital-to-analog converter (DAC) core including a plurality of thermometric arms and an R-2R ladder, the DAC core to convert a DAC code to an analog signal. The integrated circuit includes additional components as well. A differential non-linearity (DNL) calibration circuit outputs DNL coefficients based on the DAC code. A memory stores a value indicative of a product of a resistor temperature coefficient (TC) and a resistor self-heating coefficient (SHC). A current DAC (IDAC) couples to the R-2R ladder. A self-heating calibration circuit generates a self-heating trim code based on the value from the memory. An adder adds a value indicative of the DNL coefficients with the self-heating trim code to generate an IDAC trim code and provides the IDAC trim code to the IDAC to trim the R-2R ladder.

公开(公告)号：US20200162090A1

公开(公告)日：2020-05-21

申请号：US16197132

申请日：2018-11-20

Applicant: TEXAS INSTRUMENTS INCORPORATED

Inventor： Atul Kumar AGRAWAL ,  Gautam Salil NANDI ,  Siddharth MALHOTRA ,  Tanmay NEEMA

IPC: H03M1/10

Abstract: An integrated circuit includes a digital-to-analog converter (DAC) core including a plurality of thermometric arms and an R-2R ladder, the DAC core to convert a DAC code to an analog signal. The integrated circuit includes additional components as well. A differential non-linearity (DNL) calibration circuit outputs DNL coefficients based on the DAC code. A memory stores a value indicative of a product of a resistor temperature coefficient (TC) and a resistor self-heating coefficient (SHC). A current DAC (IDAC) couples to the R-2R ladder. A self-heating calibration circuit generates a self-heating trim code based on the value from the memory. An adder adds a value indicative of the DNL coefficients with the self-heating trim code to generate an IDAC trim code and provides the IDAC trim code to the IDAC to trim the R-2R ladder.

公开(公告)号：US20240310432A1

公开(公告)日：2024-09-19

申请号：US18344623

申请日：2023-06-29

Applicant: TEXAS INSTRUMENTS INCORPORATED

Inventor： Gautam Salil NANDI ,  Rajavelu THINAKARAN ,  Hariharan SRINIVASAN

IPC: G01R31/28 ,  G01R19/18 ,  G01R35/00 ,  H03F3/04

CPC classification number: G01R31/2834 ,  G01R19/18 ,  G01R35/005 ,  H03F3/04

Abstract: In some examples, a method of performing measurement of a device under test (DUT) coupled to a connector includes determining a first voltage signal representative of a current of the DUT, the current flowing through the connector. The method also includes determining a second voltage signal representative of a voltage of the DUT, as provided at the connector. The method also includes determining a calibration current according to the first voltage signal. The method also includes modifying measurement of the DUT according to the calibration current.

公开(公告)号：US20200333814A1

公开(公告)日：2020-10-22

申请号：US16386637

申请日：2019-04-17

Applicant: TEXAS INSTRUMENTS INCORPORATED

Inventor： Gautam Salil NANDI ,  Mit BHATTACHARYA

IPC: G05F1/46 ,  G05F1/575 ,  H03M1/78

Abstract: A digital-to-analog converter includes a resistor ladder, a first switch and a protection circuit. The first switch includes a first terminal and a second terminal that are respectively coupled to a rung of the resistor ladder and a reference voltage node. The protection circuit is coupled to the reference voltage node and to a reference voltage input terminal. The protection circuit includes a second switch, a third switch, and a fourth switch. First and second terminals of the second switch are respectively coupled to the reference voltage node and the reference voltage input terminal. First and second terminals of the third switch are respectively coupled to the reference voltage node and a reference voltage feedback terminal. The first and second terminals of the fourth switch are respectively coupled to the reference voltage input terminal and the reference voltage feedback terminal.