公开(公告)号：US10187940B2

公开(公告)日：2019-01-22

申请号：US15131831

申请日：2016-04-18

Applicant: Texas Instruments Incorporated

Inventor： Arup Polley ,  Ajit Sharma ,  Srinath Ramaswamy ,  Sriram Narayanan

IPC: H05B33/08 ,  A61B5/024 ,  A61B5/1455 ,  A61B5/00

Abstract: An LED (light-emitting diode) driver for a photoplethysmography system, including a switched-mode operational amplifier for driving a driver transistor with a source-drain path in series with the LED. In a first clock phase in which the LED is disconnected from the driver transistor, the amplifier is coupled in unity gain mode, and a sampling capacitor stores a voltage corresponding to the offset and flicker noise of the amplifier; the gate of the driver transistor is precharged to a reference voltage in this first clock phase. In a second clock phase, the sampled voltage at the capacitor is subtracted from the reference voltage applied to the amplifier input, so that the LED drive is adjusted according to the sampled noise. A signal from the transmitter channel is forwarded to a noise/ripple remover in the receiving channel, to remove transmitter noise from the received signal.

公开(公告)号：US10041811B2

公开(公告)日：2018-08-07

申请号：US15186394

申请日：2016-06-17

Applicant: Texas Instruments Incorporated

Inventor： Arup Polley ,  Srinath Ramaswamy ,  Baher S. Haroun ,  Rajarshi Mukhopadhyay

IPC: G01D5/14

Abstract: A high bandwidth Hall sensor includes, for example, a Hall element for generating a first polarity Hall-signal output current. An amplifier receives, at a first input, the first polarity Hall-signal output current and outputs a feedback current of a second polarity opposite the first polarity in response. The feedback current is coupled to the first input, and the feedback current suppresses an instantaneous voltage generated by the first polarity first Hall element output current at the first input. In an embodiment, the feedback current suppresses the instantaneous voltage generated by first polarity Hall element output current such that the effects of the Hall element source impedance are reduced.

公开(公告)号：US09778327B2

公开(公告)日：2017-10-03

申请号：US14848731

申请日：2015-09-09

Applicant: Texas Instruments Incorporated

Inventor： Ganesan Thiagarajan ,  Arup Polley ,  Terry Lee Sculley

IPC: G01R35/00 ,  G01R33/09 ,  G01R33/00

CPC classification number: G01R33/093 ,  G01R33/0035

Abstract: Methods and apparatus for magnetic sensors and integrated calibration. In an example arrangement, a system includes a magnetic sensor configured to output a signal corresponding to magnetic fields; a calibration trace disposed proximal to the magnetic sensor; a controlled current source coupled to the calibration trace and configured to output a current resulting in a magnetic field output from the calibration trace; and a comparator coupled to the output signal from the magnetic sensor and to an expected signal. In the example arrangement, the comparator outputs a signal indicating whether the output signal from the magnetic sensor corresponds to the expected signal. Methods are also disclosed.

公开(公告)号：US09667289B2

公开(公告)日：2017-05-30

申请号：US15084052

申请日：2016-03-29

Applicant: Texas Instruments Incorporated

Inventor： Arup Polley ,  Ajit Sharma ,  Seung Bae Lee ,  Sriram Narayanan ,  Srinath Ramaswamy

IPC: H04L27/06 ,  H04B1/10

CPC classification number: H04B1/1036 ,  H04B1/0028 ,  H04B2001/1054

Abstract: Reduced noise and power with rapid settling time and increased performance in multi-modal analog multiplexed data acquisition systems. An example apparatus arrangement includes a circuit input configured to receive a plurality of analog input signals; an analog to digital converter circuit configured to output a digital representation of an analog voltage; a selection circuit configured to select one of the analog input signals received at the circuit input; a buffer coupled to receive the selected one of the analog input signals; a filter coupled to the buffer and configured to perform a high bandwidth sample operation and a low bandwidth sample operation and having a filter output, responsive to a control signal; and a sampling capacitor coupled to the filter to sample the filter output, and having an output coupled to the analog to digital converter. Methods and additional apparatus arrangements are disclosed.

公开(公告)号：US20160293834A1

公开(公告)日：2016-10-06

申请号：US14676233

申请日：2015-04-01

Applicant: Texas Instruments Incorporated

Inventor： Arup Polley ,  Archana Venugopal ,  Robert Reid Doering ,  Luigi Colombo

IPC: H01L43/10 ,  G01R33/07 ,  H01L43/06

CPC classification number: H01L43/10 ,  G01R33/07 ,  H01L43/065

Abstract: Described examples include graphene Hall sensors, magnetic sensor systems and methods for sensing a magnetic field using an adjustable gate voltage to adapt the Hall sensor magnetic field sensitivity according to a control input for environmental or process compensation and/or real-time adaptation for balancing power consumption and minimum detectable field performance. The graphene Hall sensor gate voltage can be modulated and the sensor output signal can be demodulated to combat flicker or other low frequency noise. Also, graphene Hall sensors can be provided with capacitive coupled contacts for reliable low impedance AC coupling to instrumentation amplifiers or other circuits using integral capacitance.

Abstract translation: 所描述的实例包括石墨烯霍尔传感器，磁传感器系统和用于使用可调节栅极电压感测磁场的方法，以根据用于环境或过程补偿的控制输入和/或用于平衡功率的实时适应来适应霍尔传感器的磁场灵敏度 消耗和最小可检测现场性能。 可以对石墨烯霍尔传感器门电压进行调制，并且传感器输出信号可被解调，以防止闪烁或其他低频噪声。 此外，石墨烯霍尔传感器可以提供电容耦合触点，用于可靠的低阻抗交流耦合到仪表放大器或使用积分电容的其他电路。

公开(公告)号：US20160235313A1

公开(公告)日：2016-08-18

申请号：US14837179

申请日：2015-08-27

Applicant: Texas Instruments Incorporated

Inventor： Ajit Sharma ,  Sriram Narayanan ,  Srinath Mathur Ramaswamy ,  Arup Polley ,  Seung Bae Lee ,  Wen Li

IPC: A61B5/024 ,  A61B5/00

CPC classification number: A61B5/02427 ,  A61B5/6826 ,  A61B5/7228 ,  A61B2562/0238

Abstract: The circuitry of an optical receiver reduces the ambient DC component and the pleth DC component to leave a pleth signal with substantially only a pleth AC component. The circuitry also provides gain control and can provide transmit power control to change the range of the pleth AC component to occupy a desired input range of an analog-to-digital converter.

Abstract translation: 光接收器的电路减少环境直流分量和百分比直流分量，以便基本上只有一个良好的交流分量留下一个信号。 电路还提供增益控制，并且可以提供发射功率控制，以改变百分之AC组件的范围，以占据模数转换器的期望输入范围。

公开(公告)号：US20140049314A1

公开(公告)日：2014-02-20

申请号：US13728959

申请日：2012-12-27

Applicant: TEXAS INSTRUMENTS INCORPORATED

Inventor： Arup Polley

IPC: H03H11/02

CPC classification number: G11C5/147 ,  H03H11/02 ,  H03H11/245

Abstract: Apparatus and methods disclosed herein implement a MOS resistor using the current channel of a MOS transistor. The MOS resistance R(DS) is dependent upon MOS transistor geometry and nominal gate voltage. MOS resistor terminal-to-gate voltages are averaged and applied to the MOS transistor gate such as to maintain the MOS resistor terminal voltage to current ratio, resulting in a substantially constant R(DS). R(DS) is also compensated for temperature and process variations by adjusting gate voltages via negative feedback methods.

Abstract translation: 本文公开的装置和方法使用MOS晶体管的电流通道实现MOS电阻器。 MOS电阻R（DS）取决于MOS晶体管的几何形状和标称栅极电压。 将MOS电阻端子对栅极电压平均化并施加到MOS晶体管栅极，以将MOS电阻端子电压保持为电流比，导致基本上恒定的R（DS）。 还通过负反馈方法调整栅极电压来补偿R（DS）的温度和工艺变化。

公开(公告)号：US08508876B2

公开(公告)日：2013-08-13

申请号：US13712363

申请日：2012-12-12

Applicant: Texas Instruments Incorporated

Inventor： Arup Polley ,  Rajarshi Mukhopadhyay ,  Reza Sharifi ,  Mark A. Wolfe

IPC: G11B20/10

CPC classification number: G11B21/21 ,  G11B5/6029 ,  G11B5/6076

Abstract: A data storage system for detecting a location of a head relative to a magnetic media is described. This system comprises arms, a preamplifier circuit coupled to the arms for controlling the arms, a proximity sensing system positioned within the preamplifier circuit, the proximity sensing system comprising: an input stage for transmitting an input sense signal; a programmable gain stage coupled to receive the input sense signal and operative for transmitting a gain signal in response to receiving the input sense signal; a multiplexer coupled to receive the gain signal and at least one control signal, the multiplexer operative for transmitting a multiplexed signal; a detector coupled to receive the multiplexed signal and a second control signal, the detector operative for transmitting an output signal; wherein an amplitude associated with the output signal enables detecting the location of the head.

Abstract translation: 描述了一种用于检测头相对于磁性介质的位置的数据存储系统。 该系统包括臂，耦合到用于控制臂的臂的前置放大器电路，位于前置放大器电路内的接近感测系统，所述接近感测系统包括：用于传输输入感测信号的输入级; 可编程增益级，其被耦合以接收所述输入检测信号并且用于响应于接收所述输入检测信号而发送增益信号; 多路复用器，其耦合以接收增益信号和至少一个控制信号，多路复用器用于发送多路复用信号; 耦合以接收所述多路复用信号的检测器和第二控制信号，所述检测器用于发送输出信号; 其中与输出信号相关联的振幅使得能够检测头部的位置。