公开(公告)号：US20220179015A1

公开(公告)日：2022-06-09

申请号：US17114589

申请日：2020-12-08

Applicant: TEXAS INSTRUMENTS INCORPORATED

Inventor： Arup POLLEY ,  Srinath M. RAMASWAMY ,  Jo BITO ,  Baher S. HAROUN

IPC: G01R33/00 ,  G01R33/07

Abstract: A Hall sensor circuit includes a first Hall sensor, a second Hall sensor, a first preamplifier circuit, a second preamplifier circuit, a subtractor circuit, and a duty cycling circuit. The first preamplifier circuit includes an input and an output. The input is coupled to the first Hall sensor. The second preamplifier circuit includes a first input, a second input, and an output. The first input is coupled to the second Hall sensor. The subtractor circuit includes a first input coupled to the output of the first preamplifier circuit, a second input coupled to the output of the second preamplifier circuit, and an output coupled to the second input of the second preamplifier circuit. The duty cycling circuit is coupled to the second preamplifier circuit and the second Hall sensor.

公开(公告)号：US20170155398A1

公开(公告)日：2017-06-01

申请号：US14954577

申请日：2015-11-30

Applicant: TEXAS INSTRUMENTS INCORPORATED

Inventor： Sriram NARAYANAN ,  Srinath RAMASWAMY ,  Arup POLLEY ,  Ajit SHARMA

IPC: H03M1/06 ,  H03M1/00

CPC classification number: H03M1/0609 ,  H03M1/001 ,  H03M1/002 ,  H03M1/1295 ,  H03M1/162

Abstract: An analog to digital converter (ADC) system that includes a first amplifier configured to amplify an analog input signal to produce an amplified direct current (DC) signal, an ADC configured to receive the amplified DC signal and convert the amplified DC signal into a digital DC signal, a digital to analog converter configured to receive the digital DC signal and convert the digital DC signal into an analog DC signal, and a second amplifier configured to receive an analog alternating current (AC) signal comprising the analog DC signal subtracted from the analog input signal and amplify the analog AC signal to produce an amplified AC signal. The ADC is further configured to receive the amplified AC signal and produce a digital AC signal. The second amplifier has a gain greater than a gain of the first amplifier.

公开(公告)号：US20200182950A1

公开(公告)日：2020-06-11

申请号：US16657281

申请日：2019-10-18

Applicant: TEXAS INSTRUMENTS INCORPORATED

Inventor： Baher S. HAROUN ,  Arup POLLEY ,  Srinath M. RAMASWAMY

IPC: G01R33/07 ,  H01L43/06 ,  H01L43/04

Abstract: An amplifier includes a graphene Hall sensor (GHS). The GHS includes a graphene layer formed above a substrate, a dielectric structure formed above a channel portion of the graphene layer, and a conductive gate structure formed above at least a portion of the dielectric structure above the channel portion of the graphene layer for applying a gate voltage. The GHS also includes first and second conductive excitation contact structures coupled with corresponding first and second excitation portions of the graphene layer for applying at least one of the following to the channel portion of the graphene layer: a bias voltage; and a bias current. The GHS further includes first and second conductive sense contact structures coupled with corresponding first and second sense portions of the graphene layer. The amplifier also includes a current sense amplifier (CSA) coupled to the GHS. The CSA senses current output from the GHS.