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公开(公告)号：US20190069087A1
公开(公告)日：2019-02-28
申请号：US16175907
申请日：2018-10-31
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：US10110182B2
公开(公告)日：2018-10-23
申请号：US15382159
申请日：2016-12-16
Applicant: TEXAS INSTRUMENTS INCORPORATED
Inventor： Jasjot Singh Chadha
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：US09930452B2
公开(公告)日：2018-03-27
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：US20240230721A1
公开(公告)日：2024-07-11
申请号：US18404873
申请日：2024-01-04
Applicant: Texas Instruments Incorporated
Inventor： Rushil Kishore Kumar , James Robert Todd , Jasjot Singh Chadha , Anand Kannan , Naresh Lagadapati , Rejin K. Raveendranath
CPC classification number: G01R15/146 , G01R19/0046
Abstract: A semiconductor device includes a resistor head, a resistor body, and a sense terminal. The resistor head is constructed using a first material. The resistor body is coupled to the resistor head and is constructed using a second material having a higher resistivity than the first material. The sense terminal has a first section and a second section and is decoupled from the resistor head, in which the second section of the sense terminal is coupled between the first section of the sense terminal and the resistor body, with an end portion of the second section of the sense terminal coupled to the resistor body.
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Patent Agency Ranking
公开(公告)号：US11923813B2
公开(公告)日：2024-03-05
申请号：US17503405
申请日：2021-10-18
Applicant: Texas Instruments Incorporated
Inventor： Shaik Asif Basha , Mohit Chawla , Jasjot Singh Chadha
CPC classification number: H03F3/2173 , H03K4/90 , H03F2200/03 , H03F2200/351
Abstract: A pulse width modulated (PWM) amplifier includes a synchronization logic circuit having a first input configured to receive a bridge control signal and having a second input configured to receive a clock signal. The synchronization logic circuit is configured to provide a slope switch signal and a reference switch signal. The PWM amplifier includes a ramp generator having a first input configured to receive a first voltage supply and having a second input configured to receive a second voltage supply and having a third input configured to receive the reference switch signal and having a fourth input configured to receive the slope switch signal. The ramp generator is configured to provide a ramp signal having a first slope responsive to the slope switch signal in a first state and having a second slope responsive to the slope switch signal in a second state and to provide the clock signal.
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公开(公告)号：US11218823B2
公开(公告)日：2022-01-04
申请号：US16590590
申请日：2019-10-02
Applicant: TEXAS INSTRUMENTS INCORPORATED
Inventor： Aditya Polepeddi , Jasjot Singh Chadha , Mukund Navada Kanyana , Sahiti Priya C
IPC: H04R29/00 , G01R31/3193 , G01R31/28 , G01R31/317 , G01R31/319
Abstract: A system and method for performing speaker load diagnostics. A digital signal processor generates a diagnostic tone that is provided to the speaker. The diagnostic tone is generated using an oscillator internal to the digital signal processor. The digital signal processor receives current and voltage data from the speaker based on the diagnostic tone, and processes the current and voltage data to determine whether a fault condition exists in the speaker.
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公开(公告)号：US11177785B1
公开(公告)日：2021-11-16
申请号：US17024994
申请日：2020-09-18
Applicant: Texas Instruments Incorporated
Inventor： Shaik Asif Basha , Mohit Chawla , Jasjot Singh Chadha
Abstract: A pulse width modulated (PWM) amplifier includes a synchronization logic circuit having a first input configured to receive a bridge control signal and having a second input configured to receive a clock signal. The synchronization logic circuit is configured to provide a slope switch signal and a reference switch signal. The PWM amplifier includes a ramp generator having a first input configured to receive a first voltage supply and having a second input configured to receive a second voltage supply and having a third input configured to receive the reference switch signal and having a fourth input configured to receive the slope switch signal. The ramp generator is configured to provide a ramp signal having a first slope responsive to the slope switch signal in a first state and having a second slope responsive to the slope switch signal in a second state and to provide the clock signal.
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公开(公告)号：US10903802B2
公开(公告)日：2021-01-26
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：US10291118B2
公开(公告)日：2019-05-14
申请号：US15847383
申请日：2017-12-19
Applicant: TEXAS INSTRUMENTS INCORPORATED
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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