公开(公告)号：US10574252B2

公开(公告)日：2020-02-25

申请号：US16233198

申请日：2018-12-27

Applicant: TEXAS INSTRUMENTS INCORPORATED

Inventor： Martijn Fridus Snoeij ,  Mikhail Valeryevich Ivanov ,  Roberto Giampiero Massolini ,  Brian David Johnson

IPC: H03L7/08 ,  H03M1/12 ,  H03M1/08 ,  H03L7/18

Abstract: In at least some embodiments, a system comprises a frequency generator configured to generate a second clock signal having a second frequency using a first clock signal having a first frequency. The second frequency is offset from the first frequency and each of a plurality of harmonic frequencies of the second frequency is offset from a harmonic frequency of the first frequency. The system also includes a power converter configured to produce a power signal that at least partially corresponds to the second frequency. The system further comprises an analog-to-digital converter (ADC) configured to sample and convert analog voltages at the first frequency. The ADC is powered by the power signal.

公开(公告)号：US20200003848A1

公开(公告)日：2020-01-02

申请号：US16569741

申请日：2019-09-13

Applicant: Texas Instruments Incorporated

Inventor： Martijn Fridus Snoeij ,  Viola Schaffer ,  Gebhard Haug

IPC: G01R33/022 ,  G01R33/04

Abstract: An integrated fluxgate magnetic gradient sensor includes a common mode sensitive fluxgate magnetometer and a differential mode sensitive fluxgate magnetometer. The common mode sensitive fluxgate magnetometer includes a first core adjacent to a second core. The first and second cores are wrapped by a first excitation wire coil configured to receive an excitation current that affects a differential mode magnetic field. The differential mode sensitive fluxgate magnetometer includes a third core adjacent to the first core and a fourth core adjacent to the second core. The third and fourth cores are wrapped by a second excitation wire coil configured to receive an excitation current that affects a common mode magnetic field.

公开(公告)号：US10218374B2

公开(公告)日：2019-02-26

申请号：US15395212

申请日：2016-12-30

Applicant: TEXAS INSTRUMENTS INCORPORATED

Inventor： Martijn Fridus Snoeij ,  Mikhail Valeryevich Ivanov ,  Roberto Giampiero Massolini ,  Brian David Johnson

IPC: H03L7/08 ,  H03M1/12 ,  H03M1/08

Abstract: In at least some embodiments, a system comprises a frequency generator configured to generate a second clock signal having a second frequency using a first clock signal having a first frequency. The second frequency is offset from the first frequency and each of a plurality of harmonic frequencies of the second frequency is offset from a harmonic frequency of the first frequency. The system also includes a power converter configured to produce a power signal that at least partially corresponds to the second frequency. The system further comprises an analog-to-digital converter (ADC) configured to sample and convert analog voltages at the first frequency. The ADC is powered by the power signal.

公开(公告)号：US10018687B2

公开(公告)日：2018-07-10

申请号：US14987549

申请日：2016-01-04

Applicant: TEXAS INSTRUMENTS INCORPORATED

Inventor： Viola Schaffer ,  Martijn Fridus Snoeij ,  Mikhail Valeryevich Ivanov

IPC: G01N27/72 ,  G01R33/00 ,  G01R33/04 ,  G01R35/00 ,  G01R33/02 ,  G01R15/20 ,  G01K7/10 ,  G01J5/16 ,  G01L19/00

CPC classification number: G01R33/04 ,  G01J5/16 ,  G01K7/10 ,  G01L19/0092 ,  G01R15/20 ,  G01R33/0023 ,  G01R33/02 ,  G01R35/005

Abstract: Improved magnetic sensor excitation circuitry is presented for providing a periodic bidirectional excitation waveform to a fluxgate magnetic sensor excitation coil using a bridge circuit connected to the excitation coil and having lower transistors for switched selective connection to a current mirror input transistor to mirror a current provided by pulsed current source, and with integrated filtering to control pulse rise times and slew rate.