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公开(公告)号：US11316480B2
公开(公告)日：2022-04-26
申请号：US16904506
申请日：2020-06-17
Applicant: RichWave Technology Corp.
Inventor： Hwey-Ching Chien
Abstract: An operational amplifier includes a voltage terminal; a common terminal; a first amplification stage for receiving a differential signal pair to generate a single-end amplification signal; a first buffer for generating a first voltage according to the single-end amplification signal; a first diode for reducing the first voltage to generate a second voltage; a second amplification stage for amplifying the second voltage to generate a third voltage; a voltage stabilizing circuit for stabilizing the third voltage; a second diode coupled between the second amplification stage and the common terminal; a second buffer for generating an output voltage according to the third voltage; and a current mirror coupled to the common terminal, the first amplification stage, the first diode and the second amplification stage.
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公开(公告)号：US20210399698A1
公开(公告)日：2021-12-23
申请号：US17086472
申请日：2020-11-02
Applicant: RichWave Technology Corp.
Inventor： Hwey-Ching Chien
Abstract: A temperature compensation circuit for a power amplifier is provided, wherein data of circuit configurations corresponding to specific temperatures (including data associated with an output terminal voltage, a bias voltage, an adaptive bias, and a matching impedance of the power amplifier) for the power amplifier is stored in a read-only memory. Therefore, the temperature compensation circuit is capable of reading the data according to a temperature sensing signal to adjust the circuit configuration of the power amplifier accordingly, thereby, in a case of a constant input power of the power amplifier, an output power variance of the power amplifier is within a second interval (e.g., −10%˜+10%) when an environment temperature varies within a first interval. Therefore, the power amplifier has a stable gain.
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公开(公告)号：US20210067108A1
公开(公告)日：2021-03-04
申请号：US16990967
申请日：2020-08-11
Applicant: RichWave Technology Corp.
Inventor： Hwey-Ching Chien , Chun-Han Tai
IPC: H03F3/24
Abstract: A logarithmic power detector includes a power distributor, a first detection circuit, a second detection circuit and an output circuit. The power distributor is used to generate a first power signal and a second power signal according to an input signal. The first detection circuit is used to attenuate the first power signal to generate a first rectified signal, filter the first rectified signal to generate a first low-pass signal, and amplify the first low-pass signal to generate a first amplification current. The second detection circuit is used to attenuate the second power signal to generate a second rectified signal, filter the second rectified signal to generate a second low-pass signal, and amplify the second low-pass signal to generate a second amplification current. The output circuit is used to receive the first amplification current and the second amplification current to generate a converted voltage related to the input signal.
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公开(公告)号：US20210067101A1
公开(公告)日：2021-03-04
申请号：US16904506
申请日：2020-06-17
Applicant: RichWave Technology Corp.
Inventor： Hwey-Ching Chien
Abstract: An operational amplifier includes a voltage terminal; a common terminal; a first amplification stage for receiving a differential signal pair to generate a single-end amplification signal; a first buffer for generating a first voltage according to the single-end amplification signal; a first diode for reducing the first voltage to generate a second voltage; a second amplification stage for amplifying the second voltage to generate a third voltage; a voltage stabilizing circuit for stabilizing the third voltage; a second diode coupled between the second amplification stage and the common terminal; a second buffer for generating an output voltage according to the third voltage; and a current mirror coupled to the common terminal, the first amplification stage, the first diode and the second amplification stage.
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Patent Agency Ranking
公开(公告)号：US20210034091A1
公开(公告)日：2021-02-04
申请号：US16903365
申请日：2020-06-16
Applicant: RichWave Technology Corp.
Inventor： Hwey-Ching Chien
Abstract: A reference voltage generation circuit includes a supply voltage terminal, a node, a current source, an output terminal, a common voltage terminal, a bandgap reference circuit and a feedback circuit. The supply voltage terminal is used to provide a supply voltage. The current source is coupled between the supply voltage terminal and the node, and used to receive the supply voltage and generate a current according to a feedback signal, and output the current to establish at the node a first voltage substantially insensitive to the supply voltage. The common voltage terminal is used to provide a common voltage. The bandgap reference circuit is coupled between the node and the common voltage terminal, and used to establish a temperature-invariant bandgap voltage at the output terminal. The feedback circuit is coupled to the node and the current source, and used to generate the feedback signal according to the first voltage.
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公开(公告)号：US10901447B2
公开(公告)日：2021-01-26
申请号：US16575513
申请日：2019-09-19
Applicant: RICHWAVE TECHNOLOGY CORP.
Inventor： Hwey-Ching Chien
Abstract: A power amplifier configured to amplify a received input signal, and the power amplifier includes a bias circuit and an output stage circuit. The bias circuit includes a reference voltage circuit and a bias generating circuit. The reference voltage circuit receives the first system voltage and provides a reference voltage according to a first system voltage, and the reference voltage changes as the temperature of the wafer changes. The bias generating circuit receives the second system voltage and the reference voltage, and generates an operating voltage. The output stage circuit is coupled to the bias circuit to receive the operating voltage and the driving current to receive and amplify the input signal. When a chip temperature is changed, the bias generating circuit changes the operating voltage according to the reference voltage, such that the driving current approaches a predetermined value as the chip temperature rises.
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公开(公告)号：US10437274B2
公开(公告)日：2019-10-08
申请号：US16157077
申请日：2018-10-10
Applicant: RichWave Technology Corp.
Inventor： Hwey-Ching Chien
Abstract: A reference voltage generator includes a voltage generation circuit, an amplifier, a diode unit and a transistor. The voltage generation circuit includes an output terminal for outputting a reference voltage, a first terminal having an operational voltage, and a second terminal. The amplifier includes an input terminal coupled to the first terminal of the voltage generation circuit, an output terminal, a first terminal coupled to a first voltage terminal, and a second terminal. The diode unit includes a first terminal coupled to the second terminal of the amplifier, and a second terminal coupled to the second terminal of the voltage generation circuit and a second voltage terminal. The transistor includes a first terminal coupled to the first terminal of the amplifier, a second terminal coupled to the output terminal of the voltage generation circuit, and a control terminal coupled to the output terminal of the amplifier.
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公开(公告)号：US20190204863A1
公开(公告)日：2019-07-04
申请号：US16157077
申请日：2018-10-10
Applicant: RichWave Technology Corp.
Inventor： Hwey-Ching Chien
CPC classification number: G05F3/222 , G05F3/20 , H03F3/4508 , H03F2203/45022 , H03F2203/45318 , H03F2203/45352
Abstract: A reference voltage generator includes a voltage generation circuit, an amplifier, a diode unit and a transistor. The voltage generation circuit includes an output terminal for outputting a reference voltage, a first terminal having an operational voltage, and a second terminal. The amplifier includes an input terminal coupled to the first terminal of the voltage generation circuit, an output terminal, a first terminal coupled to a first voltage terminal, and a second terminal. The diode unit includes a first terminal coupled to the second terminal of the amplifier, and a second terminal coupled to the second terminal of the voltage generation circuit and a second voltage terminal. The transistor includes a first terminal coupled to the first terminal of the amplifier, a second terminal coupled to the output terminal of the voltage generation circuit, and a control terminal coupled to the output terminal of the amplifier.
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公开(公告)号：US09692464B1
公开(公告)日：2017-06-27
申请号：US15164830
申请日：2016-05-25
Applicant: RichWave Technology Corp.
Inventor： Ting-Yuan Cheng , Da-Cheng Peng , Zhuo Fu , Hwey-Ching Chien
IPC: H04L25/03 , H04B1/04 , H04L27/20 , H04L27/152
CPC classification number: H04B1/0475 , H04L27/152 , H04L27/20
Abstract: A signal transmitter includes a modulation circuit, a signal separation circuit, and a signal combining circuit. The modulation circuit modulates a first signal to a modulated signal. The signal separation circuit separates the modulated signal into N separated signals. The N separated signals have different phases. The signal combining circuit combines the N separated signals to eliminate at least one order of harmonic signals of the N separated signals so as to generate an output signal.
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