Patents by Inventor Andy A. Cheng
Andy A. Cheng has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).
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Publication number: 20170093339Abstract: Apparatus and methods for multi-mode power amplifiers are provided herein. In certain configurations, a wireless device includes a multi-mode power amplifier including a plurality of amplification paths electrically connected in parallel with one another. The plurality of amplification paths includes a first amplification path including an input stage of a first stage type and an output stage of a second stage type, and a second amplification path including an output stage of the second stage type. The first stage type provides non-inverting gain and the second stage type provides inverting gain. The wireless device further includes a transceiver that provides a radio frequency signal to the multi-mode power amplifier, and that operates the multi-mode power amplifier in a selected power mode chosen from a plurality of power modes based on selectively activating one or more of the plurality of amplification paths.Type: ApplicationFiled: September 12, 2016Publication date: March 30, 2017Inventors: Andy Cheng Pang Wu, Younkyu Chung
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Patent number: 9602064Abstract: Switchable feedback circuit for radio-frequency (RF) power amplifiers. In some embodiments, an RF power amplifier (PA) circuit can include a transistor having a base, a collector, and an emitter. The transistor can be configured to amplify an RF signal. The RF PA circuit can further include a switchable feedback circuit implemented between the collector and the base. The switchable feedback circuit can be configured to provide a plurality of resistance values between the collector and the base. Such a PA circuit can be implemented in products such as a die, a module, and a wireless device.Type: GrantFiled: June 28, 2014Date of Patent: March 21, 2017Assignee: Skyworks Solutions, Inc.Inventors: Andy Cheng Pang Wu, Yu-Jui Lin, Peter Phu Tran
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Publication number: 20170040958Abstract: Aspects of this disclosure relate to efficient power amplifiers, such as class-F power amplifiers. A power amplifier transistor can provide an amplified RF signal. A termination can be coupled to an output of the power amplifier transistor and configured to provide a short circuit at a second harmonic. In some instances, the termination circuit can provide an open circuit at a third harmonic. A resonant circuit can be coupled to the output terminal of the power amplifier transistor and configured to provide an open circuit at the third harmonic. In certain embodiments, an input termination circuit coupled to an input terminal of the power amplifier transistor can provide a short circuit at the second harmonic. The power amplifiers of this disclosure can be implemented, for example, in envelope tracking applications.Type: ApplicationFiled: October 17, 2016Publication date: February 9, 2017Inventors: Haibo Cao, Andy Cheng Pang Wu, Yu-Jui Lin, Joel Richard King
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Patent number: 9503025Abstract: Aspects of this disclosure relate to efficient power amplifiers, such as class-F power amplifiers. A power amplifier transistor can provide an amplified RF signal. A termination can be coupled to an output of the power amplifier transistor and configured to provide a short circuit at a second harmonic. In some instances, the termination circuit can provide an open circuit at a third harmonic. A resonant circuit can be coupled to the output terminal of the power amplifier transistor and configured to provide an open circuit at the third harmonic. In certain embodiments, an input termination circuit coupled to an input terminal of the power amplifier transistor can provide a short circuit at the second harmonic. The power amplifiers of this disclosure can be implemented, for example, in envelope tracking applications.Type: GrantFiled: March 27, 2015Date of Patent: November 22, 2016Assignee: Skyworks Solutions, Inc.Inventors: Haibo Cao, Andy Cheng Pang Wu, Yu-Jui Lin, Joel Richard King
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Publication number: 20160291202Abstract: A multi-layer composite synthetic test bed may be used to model fracture propagation and fracture networks. For example, a fracturing fluid may be introduced into a multi-layer composite synthetic test bed at a pressure and a flow rate sufficient to create a fracture network therein. Then, the fracture network may be analyzed to produce synthetic fracture data, which may be used in a fracture model.Type: ApplicationFiled: March 31, 2015Publication date: October 6, 2016Applicant: Halliburton Energy Services, Inc.Inventors: Andy Cheng Chang, Syed Muhammad Farrukh Hamza, Matthew Lewis Lahman, Jesse Clay Hampton, Ruixiang Gu, Stephen Byrne Persac
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Publication number: 20160115759Abstract: A well seal tool includes a base tubing and a seal element carried on an exterior of the base tubing. The seal element includes a polymer changeable between a compressed state and a sealing state. The seal element has a first stiffness in response to a first strain rate of the polymer and a second, substantially higher stiffness in response to a second, higher strain rate of the polymer.Type: ApplicationFiled: June 6, 2014Publication date: April 28, 2016Inventors: William Mark Richards, Andy Cheng Chang, Charles Timothy Smith
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Publication number: 20160013767Abstract: Aspects of this disclosure relate to a mode linearization switch circuit that can adjust an effective impedance provided to an output of an amplifier. In an embodiment, an apparatus includes an amplifier configured to amplify a radio frequency (RF) signal and a mode linearization switch circuit electrically coupled to an output of the amplifier. The mode linearization switch circuit can include a capacitor, a switch in series with the capacitor, and a series LC circuit in parallel with the switch.Type: ApplicationFiled: July 6, 2015Publication date: January 14, 2016Inventors: Yu-Jui Lin, Andy Cheng Pang Wu, Peter Phu Tran
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Publication number: 20160013758Abstract: Aspects of this disclosure relate to efficient power amplifiers, such as class-F power amplifiers. A power amplifier transistor can provide an amplified RF signal. A termination can be coupled to an output of the power amplifier transistor and configured to provide a short circuit at a second harmonic. In some instances, the termination circuit can provide an open circuit at a third harmonic. A resonant circuit can be coupled to the output terminal of the power amplifier transistor and configured to provide an open circuit at the third harmonic. In certain embodiments, an input termination circuit coupled to an input terminal of the power amplifier transistor can provide a short circuit at the second harmonic. The power amplifiers of this disclosure can be implemented, for example, in envelope tracking applications.Type: ApplicationFiled: March 27, 2015Publication date: January 14, 2016Inventors: Haibo Cao, Andy Cheng Pang Wu, Yu-Jui Lin, Joel Richard King
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Publication number: 20150381126Abstract: Switchable base feed circuit for radio-frequency (RF) power amplifiers. In some embodiments, an RF power amplifier (PA) circuit can include a transistor having a base, a collector, and an emitter, with the transistor being configured to amplify an RF signal. The PA circuit can further include a bias circuit configured to provide a base bias signal to the base of the transistor. The PA circuit can further include a switchable base feed circuit implemented between the bias circuit and the base of the transistor. The switchable base feed circuit can be configured to provide a plurality of different resistance values for the base bias signal between the bias circuit and the base of the transistor. Such a PA circuit can be implemented in products such as a die, a module, and a wireless device.Type: ApplicationFiled: June 28, 2014Publication date: December 31, 2015Inventors: Andy Cheng Pang WU, Yu-Jui LIN, Florina Alexandra LEFTER-ELARABI
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Publication number: 20150381123Abstract: Switchable feedback circuit for radio-frequency (RF) power amplifiers. In some embodiments, an RF power amplifier (PA) circuit can include a transistor having a base, a collector, and an emitter. The transistor can be configured to amplify an RF signal. The RF PA circuit can further include a switchable feedback circuit implemented between the collector and the base. The switchable feedback circuit can be configured to provide a plurality of resistance values between the collector and the base. Such a PA circuit can be implemented in products such as a die, a module, and a wireless device.Type: ApplicationFiled: June 28, 2014Publication date: December 31, 2015Inventors: Andy Cheng Pang WU, Yu-Jui LIN, Peter Phu TRAN
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Publication number: 20150252638Abstract: A well treatment for treating a well includes discrete stop loss elements to seal a fluid loss opening of a well. The discrete stop loss elements include polymer resistive to deformation with an initial stiffness in response to an initial strain rate of the polymer to produce a specified initial pressure signal and deformable with a subsequent, lower stiffness in response to a subsequent, lower strain rate of the polymer to produce a subsequent, different specified pressure signal.Type: ApplicationFiled: June 6, 2014Publication date: September 10, 2015Inventors: William Mark Richards, Andy Cheng Chang
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Publication number: 20150213035Abstract: Modern utilities are increasingly installing smart meters, which can typically generate hundreds of millions of data points daily. Such a massive volume of data is unwieldy to manage with the databases in current utility interface platforms. A solution converts the data to canonical documents and indexes some or all the data points such that a freeform search engine can be used to search for and access the data, resulting in a much more convenient and faster retrieval of data.Type: ApplicationFiled: April 22, 2014Publication date: July 30, 2015Inventors: Kevin Collins, Alexander Franklin Clark, Kevin Smith, Volodymyr Gukov, Andy Cheng
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Publication number: 20150198008Abstract: A wellbore cementing plug includes a plug element including a polymer. The polymer is deformable at a first stiffness when subjected to a first strain rate to allow the plug element to pass through a wellbore while sealing against passage of cement past the plug element. The polymer resists deformation at a second, higher stiffness when subjected to a second, higher strain rate to resist allowing the plug element to pass through the wellbore while sealing against passage of cement past the plug element.Type: ApplicationFiled: June 6, 2014Publication date: July 16, 2015Inventors: Charles Timothy Smith, William Mark Richards, Andy Cheng Chang
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Publication number: 20150167424Abstract: A well system includes a drop plug element and an internal plug seat in an internal flow path of a well tubing. At least one of the plug seat or the drop plug element includes a polymer that is deformable, having a first stiffness when subjected to a first strain rate, to allow the drop plug element to pass through the plug seat. The polymer resists deformation, having a second, higher stiffness when subjected to a second, higher strain rate, to resist allowing the plug element to pass through the plug seat and to seal the plug element and plug seat.Type: ApplicationFiled: June 6, 2014Publication date: June 18, 2015Inventors: William Mark Richards, Andy Cheng Chang, Timothy Edward Harms, Charles Timothy Smith
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Patent number: 9054663Abstract: Apparatus and methods for reducing capacitive loading of a power amplifier supply control module are disclosed. In one embodiment, a method of power supply control in a power amplifier system includes controlling a voltage level of a supply voltage using a supply control module, amplifying a first radio frequency (RF) signal using a first power amplifier module, amplifying a second RF signal using a second power amplifier module, delivering the supply voltage to a first supply input of the first power amplifier module through a first resonant circuit, and delivering the supply voltage to a second supply input of the second power amplifier module through a second resonant circuit. The first resonant circuit includes a first inductor and a first capacitor electrically connected in parallel, and the second resonant circuit includes a second inductor and a second capacitor electrically connected in parallel.Type: GrantFiled: March 21, 2014Date of Patent: June 9, 2015Assignee: Skyworks Solutions, Inc.Inventors: Russ Alan Reisner, Daniel Lee Kaczman, Yu-Jui Lin, Andy Cheng Pang Wu
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Patent number: 9043274Abstract: A non-transitory computer readable medium can include a local management service programmed to receive real-time status information from producer components registered within the local management service. The local management service can also periodically propagate status data to a local database based on the real-time status information, the status data corresponding to changes in the status information for at least one of the producer components. A local system manager can be programmed to push the status data across a network to a central system manager to facilitate a storing of the status data in a central database, wherein the status data pushed to the central system manager includes only status data changed in the local database.Type: GrantFiled: May 22, 2012Date of Patent: May 26, 2015Assignee: Shoretel, Inc.Inventors: Andy Cheng, Venkatraman Naganathan
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Publication number: 20140203878Abstract: Apparatus and methods for reducing capacitive loading of a power amplifier supply control module are disclosed. In one embodiment, a method of power supply control in a power amplifier system includes controlling a voltage level of a supply voltage using a supply control module, amplifying a first radio frequency (RF) signal using a first power amplifier module, amplifying a second RF signal using a second power amplifier module, delivering the supply voltage to a first supply input of the first power amplifier module through a first resonant circuit, and delivering the supply voltage to a second supply input of the second power amplifier module through a second resonant circuit. The first resonant circuit includes a first inductor and a first capacitor electrically connected in parallel, and the second resonant circuit includes a second inductor and a second capacitor electrically connected in parallel.Type: ApplicationFiled: March 21, 2014Publication date: July 24, 2014Applicant: SKYWORKS SOLUTIONS, INC.Inventors: Russ Alan Reisner, Daniel Lee Kaczman, Yu-Jui Lin, Andy Cheng Pang Wu
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Patent number: 8717100Abstract: Apparatus and methods for capacitive load reduction are disclosed. In one embodiment, a power amplifier system includes a power amplifier configured to amplify a radio frequency (RF) signal of a first frequency and an envelope tracker configured to control a supply voltage of the power amplifier using an envelope of the RF signal. The power amplifier system further includes an inductor electrically connected between the power amplifier and the envelope tracker and a capacitor electrically connected between the power amplifier and the envelope tracker. The capacitor and the inductor are configured to have a resonance near the first frequency.Type: GrantFiled: March 13, 2012Date of Patent: May 6, 2014Assignee: Skyworks Solutions, Inc.Inventors: Russ Alan Reisner, Daniel Lee Kaczman, Yu-Jui Lin, Andy Cheng Pang Wu
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Publication number: 20120235737Abstract: Apparatus and methods for capacitive load reduction are disclosed. In one embodiment, a power amplifier system includes a power amplifier configured to amplify a radio frequency (RF) signal of a first frequency and an envelope tracker configured to control a supply voltage of the power amplifier using an envelope of the RF signal. The power amplifier system further includes an inductor electrically connected between the power amplifier and the envelope tracker and a capacitor electrically connected between the power amplifier and the envelope tracker. The capacitor and the inductor are configured to have a resonance near the first frequency.Type: ApplicationFiled: March 13, 2012Publication date: September 20, 2012Applicant: SKYWORKS SOLUTIONS, INC.Inventors: Russ Alan Reisner, Daniel Lee Kaczman, Yu-Jui Lin, Andy Cheng Pang Wu
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Patent number: 8223744Abstract: A network sensor system is provided that is capable of extremely low-power operation. The network sensor system implements a communication protocol that allows the sensors to operate at most times in a sleep mode, where only a low-power time is active. In this way, each sensor's receiver, transmitter, and support circuitry are operated only when strictly necessary. The network has a defined network time frame, and each device maintains and adjusts its own clock and relationship with the network time. In this way, each sensor is aware about when it may be sent a message, and opens a short listen window only when such a message is expected. If no message is received, or if the message is addressed to another sensor, the sensor goes back to sleep. The sensor's transmitter is only activated in the case where the message 1) is received during the listen period, 2) is addressed to the sensor, and 3) requires a transmission action. Otherwise, the transmitter remains deactivated.Type: GrantFiled: May 15, 2010Date of Patent: July 17, 2012Assignee: Avaak, Inc.Inventors: Bar-Giora Goldberg, Gioia Messinger, Andy Cheng-Hsin Aoe