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.