公开(公告)号：US11867773B2

公开(公告)日：2024-01-09

申请号：US16888927

申请日：2020-06-01

Applicant: TEXAS INSTRUMENTS INCORPORATED

Inventor： Partha Sarathi Basu ,  Dimitar Trifonov Trifonov ,  Tony Ray Larson ,  Chao-Hsiuan Tsay

IPC: G01R33/00 ,  G01R33/07 ,  G06G7/184

CPC classification number: G01R33/0017 ,  G01R33/072 ,  G06G7/184

Abstract: A dual integrator system comprises two integrators, an output stage, and a switching network. The first and second integrators receive a differential Hall sensor signal and a reference voltage. The first integrator outputs a first integrator signal based on the differential Hall sensor and the reference voltage. The second integrator outputs a second integrator signal based on the differential Hall sensor signal and the reference voltage. The first integrator comprises a first offset cancellation feedback loop, and the second integrator comprises a second offset cancellation feedback loop. The switching network is coupled to the first and second integrators and to the output stage, and alternates which of the first and second integrators is coupled to the output stage. In some embodiments, the first and second integrators each perform a reset operation, a sampling operation, an integration operation, a differential to single-ended conversion operation, and a holding operation.

公开(公告)号：US11061100B2

公开(公告)日：2021-07-13

申请号：US16576963

申请日：2019-09-20

Applicant: TEXAS INSTRUMENTS INCORPORATED

Inventor： Tony Ray Larson ,  Dimitar Trifonov ,  Chao-Hsiuan Tsay ,  Partha Sarathi Basu

IPC: G01R35/00 ,  G01R15/20 ,  G01R33/07 ,  H03M1/12

Abstract: A system comprises a calibration current generator, which provides a calibration current to a first and a second Hall channel, and a bias current generator, which determines a difference between a calibration signal from the Hall channels and a threshold and adjusts a biasing current for the Hall channels based on the difference. In some embodiments, the bias current generator comprises a subtractor coupled to an ADC and a controller coupled between the ADC and a DAC. The subtractor obtains a first and a second signal from the first and second Hall channels, respectively, and subtracts the first from the second to obtain the calibration signal. The controller determines the difference between a sampled signal from the ADC and the threshold and an adjustment to the biasing current based on the difference. The DAC adjusts the biasing current based on a control signal from the controller indicating the adjustment.