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公开(公告)号：US20250150038A1
公开(公告)日：2025-05-08
申请号：US18387091
申请日：2023-11-06
Inventor： Hsin-Yuan Chiu , Hsiang-Yu Yang , Tien-I Yang
Abstract: A noise elimination device for a Class-D audio amplifier includes a residual signal detector and a multiplexer, wherein the multiplexer is electrically connected with a sigma-delta modulator (SDM) and a pulse width modulator (PWM) of the Class-D audio amplifier and the residual signal detector. The residual signal detector is configured to detect whether an input signal of the Class-D audio amplifier is residual. The multiplexer is configured to output zero data into the pulse width modulator when the residual signal detector detects that the input signal of the Class-D audio amplifier is residual.
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公开(公告)号：US12267072B2
公开(公告)日：2025-04-01
申请号：US18125331
申请日：2023-03-23
Inventor： Chih-Sheng Chang , Isaac Y. Chen
Abstract: An electronic device includes a sampling circuit and a summing circuit coupled with the sampling circuit. The sampling circuit samples a pulse width of a first input pulse of a PWM input signal since a first time point on a rising edge of a clock pulse of a clock signal. The summing circuit generates a first output pulse of a PWM output signal since a second time point on a falling edge of the clock pulse. A pulse width of the first output pulse is a summation of the pulse width of the first input pulse and a pulse width of a second input pulse of the PWM input signal, and the second input pulse is the next pulse after the first input pulse.
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公开(公告)号：US12191809B2
公开(公告)日：2025-01-07
申请号：US18326034
申请日：2023-05-31
Inventor： Yao-Wei Yang
IPC: H03K3/0231 , H03B5/04 , H03B5/12 , H03K7/06
Abstract: A voltage mode controlled linear frequency modulation oscillator comprises a voltage modulation circuit, a reference current generating circuit, and an oscillating circuit. The voltage modulation circuit is configured to generate a modulation voltage according to a feedback voltage and a first reference voltage. The reference current generating circuit, coupled to the voltage modulation circuit, is configured to generate a first reference current according to the modulation voltage and a second reference voltage. The oscillating circuit, coupled to the reference current generating circuit, is configured to generate an oscillating signal with an oscillating frequency according to the first reference current, wherein the oscillating frequency varies with the modulation voltage.
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公开(公告)号：US20240186813A1
公开(公告)日：2024-06-06
申请号：US18073593
申请日：2022-12-02
Inventor： YAO-WEI YANG
IPC: H02J7/00
CPC classification number: H02J7/007192 , H02J7/00309 , H02J7/0047
Abstract: A charger circuit comprises a constant current charging circuit and a thermal regulation circuit. The constant current charging circuit is configured for generating a charging current, including a charger input terminal for receiving an input voltage, a charge current setting terminal, a charger output terminal for outputting the charging current, a current mirror including a reference current path between the charger input terminal and charge current setting terminal and an output current path between the charger input terminal and charger output terminal, and a feedback amplifier having a positive terminal, a negative terminal for receiving a feedback reference voltage, and a feedback output terminal coupled to the current mirror. The thermal regulation circuit is configured for generating and modulating a thermal regulation voltage with temperature, and outputting the thermal regulation voltage across the positive terminal of the feedback amplifier and the charging current setting terminal.
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公开(公告)号：US20230387004A1
公开(公告)日：2023-11-30
申请号：US17826141
申请日：2022-05-26
Inventor： Chih-Sheng Chang , Isaac Y. Chen
IPC: H01L23/528 , H01L21/82 , H03K17/08
CPC classification number: H01L23/528 , H01L21/82 , H03K17/08
Abstract: An integrated circuit die forming method, for forming a plurality of integrated circuit dies on a semiconductor wafer, comprising: forming a first device, a second device in a first die in a first area; forming a metal layer connected to the first device and the second device; forming a third device, a fourth device in a second die in a second area; forming the metal layer connected to the third device and the fourth device, wherein a scribe area exists between the first area and the second area is separated by; wherein the first device and the third device are used for synchronization and are components of a class D amplifier; wherein the second device is used for preventing leakage currents of the first die and the fourth device is used for preventing leakage currents of the second die.
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Patent Agency Ranking
公开(公告)号：US11750123B1
公开(公告)日：2023-09-05
申请号：US17841699
申请日：2022-06-16
Inventor： Ming-Fu Tsai
CPC classification number: H02P6/182 , H02P6/20 , H02P2203/03
Abstract: A control circuit arranged to detect an initial rotor position of a brushless DC motor includes: a voltage integrator circuit, arranged to perform integration upon an input voltage, to generate a plurality of integrated voltages; a PWM generating circuit, arranged to generate and output a plurality of PWM signals to the brushless DC motor through a drive circuit, and stop outputting a PWM signal that is any of the plurality of PWM signals to the brushless DC motor according to an integrated voltage corresponding to the PWM signal; a current receiving circuit, arranged to receive a plurality of feedback currents from the brushless DC motor; a comparison circuit, arranged to perform comparison upon the plurality of feedback currents, to generate a comparison result; and a decision circuit, arranged to detect the initial rotor position according to the comparison result.
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公开(公告)号：US11699423B1
公开(公告)日：2023-07-11
申请号：US17583235
申请日：2022-01-25
Inventor： Hsin-Yuan Chiu , Hsiang-Yu Yang , Ya-Mien Hsu
IPC: G10K11/178 , H03G3/00
CPC classification number: G10K11/17813 , H03G3/001
Abstract: An apparatus for noise reduction in audio signal processing includes a power amplifier, a zero-crossing detector, and a threshold detector. The power amplifier has an input signal terminal for receiving an audio input signal and an output signal terminal. The audio input signal is a digital-to-analog converted version according to a version of a digital audio signal. The power amplifier has an analog gain which is controllable in response to an analog gain control signal. The zero-crossing detector determines a zero-crossing detection signal according to an internal signal provided between the input signal terminal and the output signal terminal. The threshold detector determines a gain setting according to the digital audio signal and the zero-crossing detection signal to generate the analog gain control signal indicating the gain setting, wherein the threshold detector controls the analog gain of the power amplifier according to the analog gain control signal.
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公开(公告)号：US11626868B1
公开(公告)日：2023-04-11
申请号：US17585605
申请日：2022-01-27
Inventor： Yao-Ren Chang
Abstract: A comparator circuit with dynamic biasing comprises a comparator, first dynamic biasing generator, first extra biasing device, second dynamic biasing generator, and second extra biasing device. The comparator includes a biasing circuit, input stage, active loads, and output terminal. The input stage has a first input terminal, second input terminal, first current path, and second current path. The comparator is configured to output an output signal at the output terminal according to the first input signal and second input signal. The first dynamic biasing generator is coupled between a first detection node and the first extra biasing device coupled to the biasing circuit. The second dynamic biasing generator is coupled between a second detection node and the second extra biasing device coupled to the biasing circuit. The first and second detection nodes are between the input stage and the active loads.
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公开(公告)号：US20230022551A1
公开(公告)日：2023-01-26
申请号：US17382393
申请日：2021-07-22
Inventor： Jung-Kuei Chang , Wun-Long Yu
IPC: H04R29/00 , H04B17/309
Abstract: A loudspeaker controller for estimating a fundamental resonance frequency of a loudspeaker includes: an amplifier circuit, arranged to generate a driving signal of the loudspeaker according to an audio input signal; a sensing circuit, arranged to sense characteristics of the driving signal to generate a measurement signal; a plurality of band pass filter circuits, arranged to filter the measurement signal to generate a plurality of filter outputs, respectively, wherein the plurality of band pass filter circuits have different passbands; and an estimation circuit, arranged to estimate the fundamental resonance frequency according to the plurality of filter outputs.
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公开(公告)号：US11514975B2
公开(公告)日：2022-11-29
申请号：US17206090
申请日：2021-03-18
Inventor： Shu-Han Nien
IPC: G11C11/4093 , H03F3/45 , H03F1/02
Abstract: An amplifier with an input stage comprising: a first current mirror; a first input differential pair; a first current source; a second current source; a second input differential pair, wherein the first input differential pair and the second input differential pair receive a reference voltage; a second current mirror; and a voltage control transmission circuit. An extra current path in the first current mirror is formed and a current flowing through the extra current path flows through the second current mirror to a ground when the reference voltage is higher than a first predetermined value. Also, an extra current path in the second current mirror is formed and a current flowing through the extra current path in the second current mirror flows to the first current mirror when the reference voltage is lower than a second predetermined value.
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