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公开(公告)号：US20210234537A1
公开(公告)日：2021-07-29
申请号：US17232174
申请日：2021-04-16
Applicant: TEXAS INSTRUMENTS INCORPORATED
Inventor： Sumit DUBEY , Jasjot Singh CHADHA
Abstract: A circuit includes a filter, a comparator, and converter. A first input of the comparator couples to the output of the filter. A second input of the comparator is configured to receive ramp signal. An input of the converter couples to the output of the comparator. The circuit also includes a dual minimum pulse generator having an input coupled to the output of the converter. The dual minimum pulse generator is configured to, responsive to an input pulse on the input of the dual minimum pulse generator having a pulse width less than a predetermined delay time period, generate a pulse on the first output of the dual minimum pulse generator that has a pulse width equal to a sum of the pulse width of the input pulse and the predetermined delay time period. A driver is coupled to the output of the dual minimum pulse generator.
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公开(公告)号：US20170272045A1
公开(公告)日：2017-09-21
申请号：US15382159
申请日：2016-12-16
Applicant: TEXAS INSTRUMENTS INCORPORATED
Inventor： Jasjot Singh CHADHA
CPC classification number: H03F3/2173 , H03F3/183 , H03F2200/03 , H03F2200/331 , H03F2200/351 , H03M3/50 , H04R3/002 , H04R3/04 , H04R29/001
Abstract: A system includes an audio amplifier, a duty cycle detector, a channel equalizer, and a sample-and-hold circuit. The audio amplifier is configured to amplify an analog audio signal to produce an amplified audio signal. The duty cycle detector is configured to generate a saturation detect signal at a first state upon detection that the amplified audio signal produced by the audio amplifier is clipped. The channel equalizer is configured to generate an initial estimate of a speaker terminal voltage. The sample-and-hold circuit is configured to sample and hold the initial estimate of the speaker terminal voltage as a final estimate of the speaker voltage when the saturation detect signal is in the first state.
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公开(公告)号：US20200252034A1
公开(公告)日：2020-08-06
申请号：US16553369
申请日：2019-08-28
Applicant: TEXAS INSTRUMENTS INCORPORATED
Inventor： Jasjot Singh CHADHA
Abstract: A circuit comprises a sensing resistor with a resistance Rs, a first amplifier circuit with a first gain factor G, a second amplifier circuit with a second gain factor (1/A), a third amplifier circuit, a current mirror, a buffer, and a peak voltage detector. The first amplifier circuit is coupled to the sensing resistor at a first node and a second node and to the second amplifier circuit, which is further coupled to the current mirror. The buffer is coupled to the current mirror and to the third amplifier circuit, which is further coupled to the peak voltage detector and configured to receive a voltage across a load and a voltage on a ground node. In some implementations, the load is a speaker. In some implementations, a filter is coupled between the first and the second amplifier circuits.
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公开(公告)号：US20180337644A1
公开(公告)日：2018-11-22
申请号：US15856050
申请日：2017-12-27
Applicant: TEXAS INSTRUMENTS INCORPORATED
Inventor： Aditya SUNDAR , Jasjot Singh CHADHA
CPC classification number: H03F3/2173 , H03F1/083 , H03F1/34 , H03F3/183 , H03F3/187 , H03F3/45071 , H03F3/45475 , H03F2200/03 , H03F2200/171 , H03F2200/264 , H03F2200/78 , H03F2203/45264 , H03F2203/45512 , H03F2203/45526 , H03F2203/45528 , H03F2203/45594
Abstract: In some examples, an amplifier comprises a first integrator to receive a differential input signal, a second integrator coupled to the first integrator, a third integrator coupled to the second integrator, and a comparator to receive outputs of the second and third integrators, to compare each of the outputs to a reference signal that is below a power supply rail voltage supplied to the amplifier, and to produce an error current based on the comparison. The amplifier also comprises a feedback connection between the comparator and inputs to the second integrator. The feedback connection injects the inputs to the second integrator with a current that is determined at least in part by the error current.
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Patent Agency Ranking
公开(公告)号：US20180020288A1
公开(公告)日：2018-01-18
申请号：US15395290
申请日：2016-12-30
Applicant: TEXAS INSTRUMENTS INCORPORATED
Inventor： Lars RISBO , Ryan Erik LIND , Jasjot Singh CHADHA
CPC classification number: H04R3/02 , H03F3/185 , H03F3/2173 , H03F3/3022 , H03F3/45192 , H03F2200/03 , H03F2200/351 , H03F2200/411 , H04R3/00
Abstract: A system includes a class D amplifier and a current steering digital-to-analog converter (DAC) directly connected to the class D amplifier. The system also includes a common mode servo circuit coupled to a node interconnecting the current steering DAC to the class D amplifier. The common servo circuit amplifies a difference between a common mode signal determined from the node and a reference voltage and generates a feedback current to the node based on the amplified difference. A feed-forward common-mode compensation circuit is included to reduce an alternating current (AC) ripple from the class D amplifier. The feed-forward common-mode compensation circuit includes first and second resistors coupled to respective outputs of the class D amplifier. A current mirror is coupled to the first and second resistors and is configured to sink a current from the node to ground that approximates a common mode feedback current of the class D amplifier.
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公开(公告)号：US20240230815A1
公开(公告)日：2024-07-11
申请号：US18478384
申请日：2023-09-29
Applicant: TEXAS INSTRUMENTS INCORPORATED
Inventor： Rushil KISHORE KUMAR , Jasjot Singh CHADHA , Atul AGRAWAL , Anand KANNAN , Nikhil GOYAL
CPC classification number: G01R35/005 , G01R19/25 , H04R29/001
Abstract: A circuit includes: a driver circuit; a sense resistor; a test circuit; a current sense circuit; a calibration controller; and a switch controller. The current sense circuit is configured to: obtain first sense signals responsive to a test voltage applied to the sense resistor by the test circuit, the test voltage being a direct-circuit voltage; and obtain second sense signals responsive a supply voltage applied to the sense resistor by the driver circuit, the supply voltage including a common-mode voltage. The calibration controller is configured to calibrate the current sense circuit responsive to the first sense signals and the second sense signals. The switch controller is configured to update switch control signals provided to the driver circuit responsive to current sense signals obtained by the calibrated current sense circuit.
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公开(公告)号：US20240230737A1
公开(公告)日：2024-07-11
申请号：US18478431
申请日：2023-09-29
Applicant: TEXAS INSTRUMENTS INCORPORATED
Inventor： Rushil KISHORE KUMAR , Jasjot Singh CHADHA
IPC: G01R27/14 , H03K17/687
CPC classification number: G01R27/14 , H03K17/6871
Abstract: A system includes: a drift sense circuit; and a driver calibration controller. The drift sense circuit has an input terminal, an output terminal, and a ground terminal. The drift sense circuit includes: a resistor having a first terminal and a second terminal, the first terminal of the resistor coupled to the input terminal; and a reference component having a first terminal and a second terminal, the second terminal of the reference component coupled to the ground terminal. The drift calibration controller is coupled to the output terminal of the drift sense circuit. The drift calibration controller is configured to: obtain a sense signal responsive to an input voltage applied to the input terminal; determine a drift result of the resistor responsive to the sense signal; and update a control operation responsive to the drift result.
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公开(公告)号：US20180175812A1
公开(公告)日：2018-06-21
申请号：US15730410
申请日：2017-10-11
Applicant: TEXAS INSTRUMENTS INCORPORATED
CPC classification number: H03F3/217 , H03F1/02 , H03F1/0211 , H03F3/183 , H03F3/2173 , H03F3/45 , H03F2200/03 , H03F2200/351
Abstract: An amplifier includes a first transistor coupled to a first voltage source node and a second transistor coupled to a second voltage source node. The first and second transistors also couple together at an intermediate node. The amplifier further includes a third transistor coupled to the intermediate node and a fourth transistor coupled to the third transistor at a positive output node of the amplifier. Further, the amplifier includes a fifth transistor coupled to the intermediate node and a sixth transistor coupled to the fifth transistor at a negative output node of the amplifier.
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公开(公告)号：US20180175728A1
公开(公告)日：2018-06-21
申请号：US15847383
申请日：2017-12-19
Applicant: TEXAS INSTRUMENTS INCORPORATED
CPC classification number: H02M3/156 , H02M1/08 , H02M2001/0009 , H02M2001/0048 , Y02B70/1491
Abstract: A power supply, comprising a controller comprising a first switch coupled between a first node and a second node, a first resistor coupled between the second node and a third node, a second resistor coupled between the first node and a fourth node, a capacitor coupled between the fourth node and a fifth node, an amplifier coupled at a first input to the fourth node, at a second input to the third node, and at an output to the fifth node, and a comparator coupled at a first input to the fifth node and at a second input to the third node.
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