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公开(公告)号：US11916516B2
公开(公告)日：2024-02-27
申请号：US18155261
申请日：2023-01-17
Applicant: TEXAS INSTRUMENTS INCORPORATED
Inventor： Nitin Agarwal , Kunal Karanjkar , Venkata Ramanan
CPC classification number: H03F1/0211 , H03F3/45197 , H03M1/66 , H03F2200/375 , H03F2203/45044
Abstract: Enhanced operational amplifier trim circuitry and techniques are presented herein. In one implementation, a circuit includes a reference circuit configured to produce a set of reference voltages, and a digital-to-analog conversion (DAC) circuit. The DAC circuit comprises a plurality of transistor pairs, where each pair among the plurality of transistor pairs is configured to provide portions of adjustment currents for an operational amplifier based at least on the set of reference voltages and sizing among transistors of each pair. The circuit also includes drain switching elements coupled to drain terminals of the transistors of each pair and configured to selectively couple one or more of the portions of the adjustment currents to the operational amplifier in accordance with digital trim codes.
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公开(公告)号：US11255708B2
公开(公告)日：2022-02-22
申请号：US17008156
申请日：2020-08-31
Applicant: TEXAS INSTRUMENTS INCORPORATED
Inventor： Anand Dabak , Venkata Ramanan
Abstract: A method of calculating a time difference is disclosed. The method includes sampling a first ultrasonic signal (r21) to produce a first sampled signal (y1(i)) and sampling a second ultrasonic signal (r12) to produce a second sampled signal (y2(i)). A first time (LEAD_LAG) is determined between a time the first sampled signal crosses a threshold (θ1) and a time the second sampled signal crosses the threshold. The first sampled signal is cross correlated with the second sampled signal to produce a second time (SAMP_OFFSET). The time difference is calculated in response to the first and second times.
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公开(公告)号：US20150355001A1
公开(公告)日：2015-12-10
申请号：US14300303
申请日：2014-06-10
Applicant: TEXAS INSTRUMENTS INCORPORATED
Inventor： Anand Dabak , Venkata Ramanan
Abstract: A method of calculating a time difference is disclosed. The method includes sampling a first ultrasonic signal (r21) to produce a first sampled signal (y1(i)) and sampling a second ultrasonic signal (r12) to produce a second sampled signal (y2(i)). A first time (LEAD_LAG) is determined between a time the first sampled signal crosses a threshold (θ1) and a time the second sampled signal crosses the threshold. The first sampled signal is cross correlated with the second sampled signal to produce a second time (SAMP_OFFSET). The time difference is calculated in response to the first and second times.
Abstract translation: 公开了一种计算时差的方法。 该方法包括对第一超声波信号（r21）采样以产生第一采样信号（y1（i）），并对第二超声波信号（r12）进行采样以产生第二采样信号（y2（i））。 在第一采样信号跨越阈值（＆amp; t; 1）的时间与第二采样信号越过阈值的时间之间确定第一时间（LEAD_LAG）。 第一采样信号与第二采样信号交叉相关以产生第二时间（SAMP_OFFSET）。 响应于第一次和第二次计算时间差。
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公开(公告)号：US20140303910A1
公开(公告)日：2014-10-09
申请号：US14156388
申请日：2014-01-15
Applicant: TEXAS INSTRUMENTS INCORPORATED
Inventor： Anand Dabak , Venkata Ramanan
Abstract: A method of calculating a time difference is disclosed. The method includes receiving a first ultrasonic signal (r21) from a first transducer (UT1) and receiving a second ultrasonic signal (r12) from a second ultrasonic transducer (UT2). The first and second ultrasonic signals are sampled to produce respective first and second sampled ultrasonic signals (502). Points having a value greater than a first threshold are selected from the first and second sampled ultrasonic signals (510). A difference in travel time between the first and second ultrasonic signals is calculated (512) in response to the selected points.
Abstract translation: 公开了一种计算时差的方法。 该方法包括从第一换能器（UT1）接收第一超声波信号（r21）并从第二超声换能器（UT2）接收第二超声波信号（r12）。 第一和第二超声波信号被采样以产生相应的第一和第二采样超声波信号（502）。 从第一和第二采样超声波信号（510）中选择具有大于第一阈值的值的点。 响应于所选择的点计算第一和第二超声波信号之间的行进时间差异（512）。
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公开(公告)号：US11747181B2
公开(公告)日：2023-09-05
申请号：US17574650
申请日：2022-01-13
Applicant: TEXAS INSTRUMENTS INCORPORATED
Inventor： Anand Dabak , Venkata Ramanan
Abstract: A method of calculating a time difference is disclosed. The method includes sampling a first ultrasonic signal (r21) to produce a first sampled signal (y1(i)) and sampling a second ultrasonic signal (r12) to produce a second sampled signal (y2(i)). A first time (LEAD_LAG) is determined between a time the first sampled signal crosses a threshold (θ1) and a time the second sampled signal crosses the threshold. The first sampled signal is cross correlated with the second sampled signal to produce a second time (SAMP_OFFSET). The time difference is calculated in response to the first and second times.
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Patent Agency Ranking
公开(公告)号：US11558013B2
公开(公告)日：2023-01-17
申请号：US16701629
申请日：2019-12-03
Applicant: Texas Instruments Incorporated
Inventor： Nitin Agarwal , Kunal Karanjkar , Venkata Ramanan
Abstract: Enhanced operational amplifier trim circuitry and techniques are presented herein. In one implementation, a circuit includes a reference circuit configured to produce a set of reference voltages, and a digital-to-analog conversion (DAC) circuit. The DAC circuit comprises a plurality of transistor pairs, where each pair among the plurality of transistor pairs is configured to provide portions of adjustment currents for an operational amplifier based at least on the set of reference voltages and sizing among transistors of each pair. The circuit also includes drain switching elements coupled to drain terminals of the transistors of each pair and configured to selectively couple one or more of the portions of the adjustment currents to the operational amplifier in accordance with digital trim codes.
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公开(公告)号：US20210167731A1
公开(公告)日：2021-06-03
申请号：US16701629
申请日：2019-12-03
Applicant: Texas Instruments Incorporated
Inventor： Nitin Agarwal , Kunal Karanjkar , Venkata Ramanan
Abstract: Enhanced operational amplifier trim circuitry and techniques are presented herein. In one implementation, a circuit includes a reference circuit configured to produce a set of reference voltages, and a digital-to-analog conversion (DAC) circuit. The DAC circuit comprises a plurality of transistor pairs, where each pair among the plurality of transistor pairs is configured to provide portions of adjustment currents for an operational amplifier based at least on the set of reference voltages and sizing among transistors of each pair. The circuit also includes drain switching elements coupled to drain terminals of the transistors of each pair and configured to selectively couple one or more of the portions of the adjustment currents to the operational amplifier in accordance with digital trim codes.
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公开(公告)号：US10955273B2
公开(公告)日：2021-03-23
申请号：US14156388
申请日：2014-01-15
Applicant: TEXAS INSTRUMENTS INCORPORATED
Inventor： Anand Dabak , Venkata Ramanan
Abstract: A method of calculating a time difference is disclosed. The method includes receiving a first ultrasonic signal (r21) from a first transducer (UT1) and receiving a second ultrasonic signal (r12) from a second ultrasonic transducer (UT2). The first and second ultrasonic signals are sampled to produce respective first and second sampled ultrasonic signals (502). Points having a value greater than a first threshold are selected from the first and second sampled ultrasonic signals (510). A difference in travel time between the first and second ultrasonic signals is calculated (512) in response to the selected points.
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公开(公告)号：US20230155553A1
公开(公告)日：2023-05-18
申请号：US18155261
申请日：2023-01-17
Applicant: TEXAS INSTRUMENTS INCORPORATED
Inventor： Nitin Agarwal , Kunal Karanjkar , Venkata Ramanan
CPC classification number: H03F1/0211 , H03F3/45197 , H03M1/66 , H03F2203/45044 , H03F2200/375
Abstract: Enhanced operational amplifier trim circuitry and techniques are presented herein. In one implementation, a circuit includes a reference circuit configured to produce a set of reference voltages, and a digital-to-analog conversion (DAC) circuit. The DAC circuit comprises a plurality of transistor pairs, where each pair among the plurality of transistor pairs is configured to provide portions of adjustment currents for an operational amplifier based at least on the set of reference voltages and sizing among transistors of each pair. The circuit also includes drain switching elements coupled to drain terminals of the transistors of each pair and configured to selectively couple one or more of the portions of the adjustment currents to the operational amplifier in accordance with digital trim codes.
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公开(公告)号：US20220136878A1
公开(公告)日：2022-05-05
申请号：US17574650
申请日：2022-01-13
Applicant: TEXAS INSTRUMENTS INCORPORATED
Inventor： Anand Dabak , Venkata Ramanan
Abstract: A method of calculating a time difference is disclosed. The method includes sampling a first ultrasonic signal (r21) to produce a first sampled signal (y1(i)) and sampling a second ultrasonic signal (r12) to produce a second sampled signal (y2(i)). A first time (LEAD_LAG) is determined between a time the first sampled signal crosses a threshold (θ1) and a time the second sampled signal crosses the threshold. The first sampled signal is cross correlated with the second sampled signal to produce a second time (SAMP_OFFSET). The time difference is calculated in response to the first and second times.
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