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公开(公告)号：US20190103840A1
公开(公告)日：2019-04-04
申请号：US15725263
申请日：2017-10-04
Applicant: NOVATEK Microelectronics Corp.
Inventor： Hsiang-Yi Chiu
Abstract: An amplifier circuit includes an input stage, having a positive input end and a negative a negative input end, for generating a pair of differential signals according to a first input voltage received from the positive input end and a second input voltage received from a negative input end; an output stage, coupled to the input stage for generating an output voltage at an output end according to the pair of differential signals; a feedback stage, coupled between the output end and the negative input end; and a clamping unit, coupled between the positive input end and the negative input end for adjusting the second input voltage when the first input voltage is varied so as to clamp a voltage difference between the first input voltage and second input voltage.
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公开(公告)号：US11625054B2
公开(公告)日：2023-04-11
申请号：US17349940
申请日：2021-06-17
Applicant: NOVATEK Microelectronics Corp.
Inventor： Hsiang-Yi Chiu
Abstract: A voltage-to-current converter includes a first transistor having a drain coupled to a first node, a second transistor having a drain coupled to the first node, an operational amplifier having a first input terminal configured to receive a reference voltage and a second input terminal coupled to a source of the first transistor or a source of the second transistor, a control circuit having an input terminal coupled to an output terminal of the operational amplifier, a first output terminal coupled to a gate of the first transistor, and a second output terminal coupled to a gate of the second transistor, a first resistor coupled between the source of the first transistor and a ground, and a second resistor coupled between the source of the second transistor and the ground. An output current of the voltage-to-current converter is generated from the first node.
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公开(公告)号：US20130342265A1
公开(公告)日：2013-12-26
申请号：US14010499
申请日：2013-08-26
Applicant: NOVATEK Microelectronics Corp.
Inventor： Hsiang-Yi Chiu , Zhen-Guo Ding
IPC: G05F1/10
Abstract: A charge pump device is disclosed. The charge pump device includes a driving stage, for generating a driving signal corresponding to a driving capability; a charge pump circuit, for generating an output voltage according to the driving signal; a comparing circuit, comprising a first comparator for comparing the output voltage and a first reference voltage to generate a first comparing result; an overload detection circuit, for generating a detection result according to at least one of the first comparing result and the output voltage; and a driving capability control circuit, coupled between the overload detection circuit and the driving stage for controlling the driving capability corresponding to the driving signal according to the detection result.
Abstract translation: 公开了电荷泵装置。 电荷泵装置包括用于产生与驱动能力对应的驱动信号的驱动级; 电荷泵电路，用于根据驱动信号产生输出电压; 比较电路，包括用于比较输出电压和第一参考电压以产生第一比较结果的第一比较器; 过载检测电路，用于根据第一比较结果和输出电压中的至少一个产生检测结果; 以及驱动能力控制电路，其耦合在过载检测电路和驱动级之间，用于根据检测结果控制与驱动信号相对应的驱动能力。
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公开(公告)号：US20240014644A1
公开(公告)日：2024-01-11
申请号：US17858032
申请日：2022-07-05
Applicant: NOVATEK Microelectronics Corp.
Inventor： Hsiang-Yi Chiu
CPC classification number: H02H3/08 , H02H1/0007
Abstract: A multi-channel circuit is provided. The multi-channel circuit includes a plurality of channel circuits and an overcurrent protection circuit. The channel circuits are configured to output sensing signals associated with channel output signals. Each channel circuit includes a channel output circuit for outputting a channel output signal and one of the sensing signals is associated with the channel output signal of the channel output circuit. The overcurrent protection circuit includes a selection circuit, a current sensing circuit and a comparator. The selection circuit is configured to receive sensing signals associated with channel output signals and select a target sensing signal from the sensing signals. The current sensing circuit is configured into convert the target sensing signal into a target sensing voltage. The comparator is configured to compare the target sensing voltage with a reference voltage to generate a comparison result indicating an overcurrent situation of the channel circuits.
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公开(公告)号：US20220404849A1
公开(公告)日：2022-12-22
申请号：US17349940
申请日：2021-06-17
Applicant: NOVATEK Microelectronics Corp.
Inventor： Hsiang-Yi Chiu
Abstract: A voltage-to-current converter includes a first transistor having a drain coupled to a first node, a second transistor having a drain coupled to the first node, an operational amplifier having a first input terminal configured to receive a reference voltage and a second input terminal coupled to a source of the first transistor or a source of the second transistor, a control circuit having an input terminal coupled to an output terminal of the operational amplifier, a first output terminal coupled to a gate of the first transistor, and a second output terminal coupled to a gate of the second transistor, a first resistor coupled between the source of the first transistor and a ground, and a second resistor coupled between the source of the second transistor and the ground. An output current of the voltage-to-current converter is generated from the first node.
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Patent Agency Ranking
公开(公告)号：US11469744B1
公开(公告)日：2022-10-11
申请号：US17493006
申请日：2021-10-04
Applicant: NOVATEK MICROELECTRONICS CORP.
Inventor： Hsiang-Yi Chiu
IPC: H03L5/00 , H03K3/037 , H03K19/0185 , H03K19/0948 , H03K3/356
Abstract: A level shifter includes a pre-level shifter and a selector. The selector is coupled to the pre-level shifter. The pre-level shifter shifts an input digital voltage to a first digital voltage and a second digital voltage. The levels of the first digital voltage and the second digital voltage transition sequentially in time when the level of the input digital voltage transitions from one logic to the other. The selector selects and outputs the first digital voltage whose level transitions earlier in time compared to the transition of the level of the second digital voltage.
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公开(公告)号：US10790826B1
公开(公告)日：2020-09-29
申请号：US16416261
申请日：2019-05-19
Applicant: NOVATEK Microelectronics Corp.
Inventor： Hsiang-Yi Chiu
IPC: H03K3/012 , H03K19/0175 , H03K19/0185 , H03K3/037
Abstract: A level shifter is disclosed. The level shifter comprises a pulse generating circuit, configured to receive an input signal, and generate a plurality of first-level pulses having a pulse width shorter than a pulse width of the input signal, wherein the input signal swings over a first voltage domain; a pulse transforming circuit, coupled to the pulse generating circuit, configured to generate a plurality of second-level pulses corresponding to the plurality of first-level pulses; and a latching circuit, coupled to the pulse transforming circuit, configured to generate an output signal by latching a status of the output signal in response to the plurality of second-level pulses, wherein the output signal swings over a second voltage domain.
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公开(公告)号：US09007121B2
公开(公告)日：2015-04-14
申请号：US14010499
申请日：2013-08-26
Applicant: NOVATEK Microelectronics Corp.
Inventor： Hsiang-Yi Chiu , Zhen-Guo Ding
Abstract: A charge pump device is disclosed. The charge pump device includes a driving stage, for generating a driving signal corresponding to a driving capability; a charge pump circuit, for generating an output voltage according to the driving signal; a comparing circuit, comprising a first comparator for comparing the output voltage and a first reference voltage to generate a first comparing result; an overload detection circuit, for generating a detection result according to at least one of the first comparing result and the output voltage; and a driving capability control circuit, coupled between the overload detection circuit and the driving stage for controlling the driving capability corresponding to the driving signal according to the detection result.
Abstract translation: 公开了电荷泵装置。 电荷泵装置包括用于产生与驱动能力对应的驱动信号的驱动级; 电荷泵电路，用于根据驱动信号产生输出电压; 比较电路，包括用于比较输出电压和第一参考电压以产生第一比较结果的第一比较器; 过载检测电路，用于根据第一比较结果和输出电压中的至少一个产生检测结果; 以及驱动能力控制电路，其耦合在过载检测电路和驱动级之间，用于根据检测结果控制与驱动信号相对应的驱动能力。
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公开(公告)号：US11032886B2
公开(公告)日：2021-06-08
申请号：US16932858
申请日：2020-07-20
Applicant: Novatek Microelectronics Corp.
Inventor： Tuo-Kuang Chen , Hsiang-Yi Chiu , Chiun-He Lin , Yao-Cheng Lin
IPC: H05B45/325 , H05B45/10
Abstract: The invention provides a light-emitting diode (LED) driver and a driving method thereof. The LED driver includes a brightness code calculation circuit, a driving current generation circuit and a control circuit. The brightness code calculation circuit is configured to to receive a pulse width modulation (PWM) signal and perform a calculation operation comprising calculating a duty cycle of the PWM signal with respect to a period of the PWM signal and generating a brightness code according to the duty cycle of the PWM signal. The driving current generation circuit is configured to generate a driving current according to the brightness code. The control circuit is configured to detect a plurality of brightness codes generated by the brightness code calculation circuit repeatedly performing the calculation operation and determine whether or not to adjust an execution frequency of the calculation operation of the brightness code calculation circuit according to the brightness codes.
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公开(公告)号：US20210037625A1
公开(公告)日：2021-02-04
申请号：US16932858
申请日：2020-07-20
Applicant: Novatek Microelectronics Corp.
Inventor： Tuo-Kuang Chen , Hsiang-Yi Chiu , Chiun-He Lin , Yao-Cheng Lin
IPC: H05B45/325 , H05B45/10
Abstract: The invention provides a light-emitting diode (LED) driver and a driving method thereof. The LED driver includes a brightness code calculation circuit, a driving current generation circuit and a control circuit. The brightness code calculation circuit is configured to to receive a pulse width modulation (PWM) signal and perform a calculation operation comprising calculating a duty cycle of the PWM signal with respect to a period of the PWM signal and generating a brightness code according to the duty cycle of the PWM signal. The driving current generation circuit is configured to generate a driving current according to the brightness code. The control circuit is configured to detect a plurality of brightness codes generated by the brightness code calculation circuit repeatedly performing the calculation operation and determine whether or not to adjust an execution frequency of the calculation operation of the brightness code calculation circuit according to the brightness codes.
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