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公开(公告)号：US10484636B2
公开(公告)日：2019-11-19
申请号：US15926025
申请日：2018-03-20
Applicant: TEXAS INSTRUMENTS INCORPORATED
Inventor： Sravana Kumar Goli , Jeevan Mithra , Nagesh Surendranath , Sandeep Kesrimal Oswal
IPC: H04N5/3745 , H04N5/361 , H04N5/365 , H04N5/374 , H04N5/363
Abstract: An active pixel sensor a plurality of sensor pixels disposed in a row, a plurality of sensor pixels in a column, and steering circuitry coupled to each of the sensor pixels. Each of the sensor pixels includes a first pixel circuit, and a second pixel circuit. For each of the sensor pixels, the steering circuitry includes a first switch, a second switch, a third switch, and a fourth switch. The first switch and the second switch are connected in series to route an input signal to the first pixel circuit. The third switch and a fourth switch are connected in parallel to route the input signal to the second pixel circuit.
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公开(公告)号：US10481283B2
公开(公告)日：2019-11-19
申请号：US16181386
申请日：2018-11-06
Applicant: Texas Instruments Incorporated
Inventor： Rakul Viswanath , Nagesh Surendranath , Goli Sravana Kumar
Abstract: A photon counting system includes a photon sensor, a charge-sensitive amplifier (CSA) and an analog-to-digital converter (ADC). The CSA is configured to convert photon energy detected by the photon sensor to voltage pulses. The ADC is configured to digitize the voltage pulses generated by the CSA. The ADC includes successive approximation circuitry. The successive approximation circuitry includes an N-bit digital-to-analog converter (DAC), an N-bit successive approximation register (SAR), a plurality of N-bit registers, and a multiplexer configured to selectively route outputs of the SAR and outputs of the N-bit registers to the DAC for conversion to an analog signal.
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公开(公告)号：US10180351B2
公开(公告)日：2019-01-15
申请号：US15373242
申请日：2016-12-08
Applicant: TEXAS INSTRUMENTS INCORPORATED
Inventor： Rakul Viswanath , Nagesh Surendranath , Sandeep Kesrimal Oswal
Abstract: A circuit includes a charge sensitive amplifier (CSA) that includes an input to receive current from a photon sensor and generates an output signal that represents photons received by the sensor and dark current of the sensor. A control circuit generates a compensation signal to offset the dark current from the photon sensor at the input of the CSA. The control circuit couples feedback from the CSA to enable the compensation signal if the photon current received from the sensor is below a predetermined threshold. The control circuit decouples the feedback from the CSA to disable the compensation signal if the photon current received from the sensor is above the predetermined threshold.
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公开(公告)号：US11493649B2
公开(公告)日：2022-11-08
申请号：US17114962
申请日：2020-12-08
Applicant: Texas Instruments Incorporated
Inventor： Rakul Viswanath , Nagesh Surendranath , Sandeep Kesrimal Oswal , Ratna Kumar Venkata Parupudi
Abstract: In described examples, a charge sensitive amplifier (CSA) generates an integrated signal in response to a current signal. A high pass filter is coupled to the CSA and receives the integrated signal and an inverse of an event signal, the high pass filter generates a coarse signal. An active comparator is coupled to the high pass filter and receives the coarse signal and a primary reference voltage signal, the active comparator generates the event signal.
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公开(公告)号：US20160182017A1
公开(公告)日：2016-06-23
申请号：US14580388
申请日：2014-12-23
Applicant: Texas Instruments Incorporated
Inventor： Rahul Sharma , Nagesh Surendranath , Sandeep Kesrimal Oswal
IPC: H03K3/012 , H02M1/12 , H03K17/687 , H02M1/08
CPC classification number: H03K3/012 , G05F1/561 , G06G7/184 , G06G7/186 , H02M1/08 , H02M1/12 , H02M2001/123 , H03F3/082 , H03H11/1291 , H03H19/004 , H03K4/023 , H03K17/687
Abstract: Charge to voltage conversion integrator circuitry for data acquisition front-end and other applications to provide a single-ended up a voltage using an input bias capacitance and a switching circuit to selectively place an input transistor in a negative feedback configuration in a first mode to charge the input bias capacitance to a calibration voltage for compensating integrator amplifier bias circuitry, with the switching circuit connecting an input node and the input bias capacitance in a second mode to integrate the input current signal across a feedback capacitance to provide a single-ended output voltage with the input bias capacitance maintaining a zero voltage at the input node.
Abstract translation: 充电到电压转换积分电路，用于数据采集前端和其他应用，以提供使用输入偏置电容的单端上电压和开关电路，以在第一模式中将输入晶体管选择性地置于负反馈配置中以进行充电 将校准电压的输入偏置电容用于补偿积分放大器偏置电路，其中开关电路将输入节点和输入偏置电容连接在第二模式中，以将输入电流信号整合在反馈电容上以提供单端输出电压 输入偏置电容在输入节点保持零电压。
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Patent Agency Ranking
公开(公告)号：US20220021789A1
公开(公告)日：2022-01-20
申请号：US16928248
申请日：2020-07-14
Applicant: Texas Instruments Incorporated
Inventor： Nagesh Surendranath , Sravana Kumar Goli
Abstract: In described examples, a circuit includes an integrator. The integrator receives an input signal. A first sampling network is coupled to the integrator and generates a signal voltage. A second sampling network is coupled to the integrator and generates a pixel sampled noise voltage. The pixel sampled noise voltage generated in a previous cycle is subtracted from the signal voltage generated in a current cycle to generate a true signal voltage.
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公开(公告)号：US11152903B2
公开(公告)日：2021-10-19
申请号：US16660302
申请日：2019-10-22
Applicant: Texas Instruments Incorporated
Inventor： Nagesh Surendranath , Shriram Mahendra Devi , Sravana Kumar Goli
IPC: H03F3/45
Abstract: In accordance with one embodiment, an apparatus includes a first amplifier having a noninverting input, an inverting input and an output. The noninverting input is coupled to a first ground reference. The inverting input is coupled to an output of an external sensor. The apparatus also includes a second amplifier having a noninverting input, an inverting input and an output. The noninverting input is coupled to the first ground reference. The inverting input is coupled to the power supply through a first variable capacitor and to the second ground reference through a second variable capacitor. The output is coupled to the inverting input of the first amplifier. The external sensor is coupled to a third ground reference, and the first amplifier and second amplifier are coupled to the second ground reference.
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公开(公告)号：US20210119594A1
公开(公告)日：2021-04-22
申请号：US16660302
申请日：2019-10-22
Applicant: Texas Instruments Incorporated
Inventor： Nagesh Surendranath , Shriram Mahendra Devi , Sravana Kumar Goli
IPC: H03F3/45
Abstract: In accordance with one embodiment, an apparatus includes a first amplifier having a noninverting input, an inverting input and an output. The noninverting input is coupled to a first ground reference. The inverting input is coupled to an output of an external sensor. The apparatus also includes a second amplifier having a noninverting input, an inverting input and an output. The noninverting input is coupled to the first ground reference. The inverting input is coupled to the power supply through a first variable capacitor and to the second ground reference through a second variable capacitor. The output is coupled to the inverting input of the first amplifier. The external sensor is coupled to a third ground reference, and the first amplifier and second amplifier are coupled to the second ground reference.
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公开(公告)号：US20190086561A1
公开(公告)日：2019-03-21
申请号：US16181386
申请日：2018-11-06
Applicant: Texas Instruments Incorporated
Inventor： Rakul Viswanath , Nagesh Surendranath , Goli Sravana Kumar
IPC: G01T1/24
Abstract: A photon counting system includes a photon sensor, a charge-sensitive amplifier (CSA) and an analog-to-digital converter (ADC). The CSA is configured to convert photon energy detected by the photon sensor to voltage pulses. The ADC is configured to digitize the voltage pulses generated by the CSA. The ADC includes successive approximation circuitry. The successive approximation circuitry includes an N-bit digital-to-analog converter (DAC), an N-bit successive approximation register (SAR), a plurality of N-bit registers, and a multiplexer configured to selectively route outputs of the SAR and outputs of the N-bit registers to the DAC for conversion to an analog signal.
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公开(公告)号：US10024979B1
公开(公告)日：2018-07-17
申请号：US15800313
申请日：2017-11-01
Applicant: TEXAS INSTRUMENTS INCORPORATED
Inventor： Rakul Viswanath , Nagesh Surendranath , Ratna Kumar Venkata Parupudi
IPC: G01T1/172
Abstract: A photon counting system includes a photon sensor and pixel circuitry. The pixel circuitry includes a charge sensitive amplifier (CSA), an analog to digital converter (ADC), an event detector, and a coincidence detector. The CSA is configured to convert photon energy detected by the photon sensor to a voltage pulse. The ADC is coupled to an output of the CSA. The ADC is configured to digitize the voltage pulses generated by the CSA. The event detector is configured to determine whether output voltage of the CSA exceeds an event threshold voltage, and to trigger the ADC to digitize the output voltage based on the output voltage exceeding the event threshold voltage. The coincidence detector is configured to determine whether the output voltage of the CSA exceeds a coincidence threshold voltage, and to trigger the ADC to digitize the output voltage based on the output voltage exceeding the coincidence threshold voltage.
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