Patents by Inventor Saihua Lin
Saihua Lin 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: 20210391843Abstract: A radio frequency filtering circuitry includes a first inductor, a second inductor, and a conductive loop. The first inductor receives a first current that induces a second current in the second inductor upon receiving the first current. The first inductor and/or the second inductor induce a third current in the conductive loop. The conductive loop adjusts the third current to reduce a first gain peak of an output signal to correlate to a second gain peak of the output signal.Type: ApplicationFiled: April 19, 2021Publication date: December 16, 2021Inventors: Hongrui Wang, Sohrab Emami-Neyestanak, Saihua Lin
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Publication number: 20210358677Abstract: Radio frequency filtering circuitry blocks certain frequencies in an outgoing signal so that the signal may be transmitted over a desired frequency. The radio frequency filtering circuitry includes a first inductor having a first coil and a second inductor coupled to and disposed within the first coil. The second inductor has a second coil and a third coil symmetrical to the second coil. When current is applied to the radio frequency filtering circuitry, the current in the second coil causes a first induced current in the first coil and the current in the third coil causes a second induced current in the first coil, wherein the second induced current is approximately equal in magnitude and opposite in direction to the first induced current. As such, the second induced current may compensate for the first induced current.Type: ApplicationFiled: May 12, 2020Publication date: November 18, 2021Inventors: Hongrui Wang, Saihua Lin, Abbas Komijani, Sohrab Emami-Neyestanak
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Patent number: 10985724Abstract: A radio frequency filtering circuitry includes a first inductor, a second inductor, and a conductive loop. The first inductor receives a first current that induces a second current in the second inductor upon receiving the first current. The first inductor and/or the second inductor induce a third current in the conductive loop. The conductive loop adjusts the third current to reduce a first gain peak of an output signal to correlate to a second gain peak of the output signal.Type: GrantFiled: June 10, 2020Date of Patent: April 20, 2021Assignee: Apple Inc.Inventors: Hongrui Wang, Sohrab Emami-Neyestanak, Saihua Lin
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Publication number: 20210055402Abstract: A sensor circuit included in a computer system may include multiple antennae and transceiver circuits that include transmitter and receiver circuits. A particular transceiver circuit may transmit, via a particular antenna, a transmit signal that is a modulated version of a baseband signal, and generate a leakage signal based on leakage between transmitter and receiver circuits included in the particular transceiver circuit. A different transceiver circuit may generate a received signal using a reflected version of the transmitted signal that is received via a different antenna. An output signal may be generated using the received and leakage signals.Type: ApplicationFiled: August 23, 2019Publication date: February 25, 2021Inventors: Saihua Lin, Sohrab Emami-Neyestanak, Hongrui Wang
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Patent number: 10819384Abstract: A transceiver circuit that includes a receiver and transmitter circuits may send and receive data signals using an antenna. The transceiver circuit may be coupled to the antenna and other circuits using multiple impedance matching networks configured to match input and output impedance values of the receiver and transmitter circuits to the antenna and other circuits. The impedance matching networks may selectively couple and decouple different ports of the receiver and transmitter circuits to other circuit nodes based on whether the transceiver is operating in transmit or receive mode.Type: GrantFiled: September 28, 2018Date of Patent: October 27, 2020Assignee: Apple Inc.Inventors: Sohrab Emami-Neyestanak, Saihua Lin
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Publication number: 20200106472Abstract: A transceiver circuit that includes a receiver and transmitter circuits may send and receive data signals using an antenna. The transceiver circuit may be coupled to the antenna and other circuits using multiple impedance matching networks configured to match input and output impedance values of the receiver and transmitter circuits to the antenna and other circuits. The impedance matching networks may selectively couple and decouple different ports of the receiver and transmitter circuits to other circuit nodes based on whether the transceiver is operating in transmit or receive mode.Type: ApplicationFiled: September 28, 2018Publication date: April 2, 2020Inventors: Sohrab Emami-Neyestanak, Saihua Lin
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Patent number: 10461914Abstract: A triplexer having integrated switching circuitry is disclosed. In one embodiment, a triplexer is used, in a transmit mode, to combine a clock signal, a control signal, and a modulated (e.g., a radio frequency, or RF) signal into a composite signal for transmission over a transmission line. In a receive mode, the triplexer receives and separates the composite signal into the clock signal, the control signal, and the modulated signal. The triplexer further includes switching circuitry integrated therein. The switching circuitry is operable to switch the triplexer between the transmit and receive modes.Type: GrantFiled: March 27, 2018Date of Patent: October 29, 2019Assignee: Apple Inc.Inventors: Saihua Lin, Sohrab Emami-Neyestanak
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Publication number: 20190305919Abstract: A triplexer having integrated switching circuitry is disclosed. In one embodiment, a triplexer is used, in a transmit mode, to combine a clock signal, a control signal, and a modulated (e.g., a radio frequency, or RF) signal into a composite signal for transmission over a transmission line. In a receive mode, the triplexer receives and separates the composite signal into the clock signal, the control signal, and the modulated signal. The triplexer further includes switching circuitry integrated therein. The switching circuitry is operable to switch the triplexer between the transmit and receive modes.Type: ApplicationFiled: March 27, 2018Publication date: October 3, 2019Inventors: Saihua Lin, Sohrab Emami-Neyestanak
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Patent number: 9871488Abstract: A method and apparatus for transmitting a communication signal through a dual-mode power amplifier may include amplifying a communication signal by a first amplifier and/or a second amplifier of the dual-mode power amplifier based on a desired transmit output power. The output of the first amplifier may be selectively coupled through a configurable inductive coupler to an antenna.Type: GrantFiled: January 28, 2015Date of Patent: January 16, 2018Assignee: QUALCOMM IncorporatedInventor: Saihua Lin
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Patent number: 9823678Abstract: A voltage regulator includes: a difference amplifier with first input terminal connected to a reference voltage; a first transistor having a first terminal connected to a supply voltage, a control terminal connected to the output terminal of the difference amplifier, and a second terminal configured to supply a regulated voltage to a load; a feedback circuit connected to the second terminal of the first transistor and configured to supply a feedback voltage to a second input terminal of the difference amplifier; and a current compensator configured to draw a compensation current from the first transistor when a load current supplied by the first transistor to the load is less than a threshold current, thereby increasing the first current through the first transistor, and configured to draw substantially no compensation current from the first transistor when the load current is greater than or equal to the threshold current.Type: GrantFiled: June 23, 2016Date of Patent: November 21, 2017Assignee: Avago Technologies General IP (Singapore) Pte. Ltd.Inventor: Saihua Lin
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Patent number: 9755595Abstract: A device includes: a transistor having an input terminal configured to receive an input signal and to amplify the input signal; a bias current source configured to set a bias current of the input terminal of the transistor, the bias current source having a control input for receiving a control signal for selecting the bias current to have one of a plurality of selectable bias current levels; a bias resistance connected between the bias current source and the input terminal of the transistor; a bypass switch for selectively bypassing a first part of the bias resistance; and a control circuit for controlling the bypass switch to bypass the part of the bias resistance for a predefined time period in response to a change in the bias current level, and for controlling the bypass switch to stop bypassing the first part of the bias resistance after the predefined time period expires.Type: GrantFiled: April 15, 2016Date of Patent: September 5, 2017Assignee: Avago Technologies General IP (Singapore) Pte. Ltd.Inventor: Saihua Lin
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Patent number: 9692368Abstract: An apparatus includes amplification circuitry configured to amplify a radio frequency (RF) signal. The apparatus also includes differential inductors coupled to an output of the amplification circuitry. The differential inductors include a first inductor serially coupled to a second inductor, and the differential inductors are configured to filter the RF signal and to provide a differential output.Type: GrantFiled: September 9, 2014Date of Patent: June 27, 2017Assignee: QUALCOMM IncorporatedInventors: Saihua Lin, Anup Savla, Mounir Youssef Bohsali
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Patent number: 9548774Abstract: A method and apparatus are disclosed for generating a quadrature signal that may be used to modulate and/or demodulate communication signals transmitted between communication devices. A quadrature signal generator may include a control block, a mixer, and a filter. The control block may generate a reference signal and a filter control signal based on an input clock signal. The mixer may generate a mixer output signal based on the input clock signal and the reference signal. The filter, controlled by the filter control signal, may filter the mixer output signal to suppress a band of frequencies within the mixer output signal.Type: GrantFiled: February 19, 2015Date of Patent: January 17, 2017Assignee: QUALCOMM IncorporatedInventors: Saihua Lin, Jianlei Shi
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Patent number: 9543900Abstract: A transceiver configured to transmit data in a plurality of operating modes including a Wi-Fi mode and two or more different Bluetooth power modes, the transceiver comprising: a first power amplifier configured to amplify Bluetooth signals; a second power amplifier configured to amplify Wi-Fi signals; an antenna coupled to the second power amplifier; and a tunable load circuit, coupled between the first amplifier and the second amplifier, configured to provide a different load impedance for each of the plurality of operating modes, the tunable load circuit consisting of: two impedance paths coupled in parallel between output terminals of the first and second amplifiers; and a number of shunt paths coupled between the tunable load circuit and ground potential.Type: GrantFiled: June 19, 2015Date of Patent: January 10, 2017Assignee: QUALCOMM IncorporatedInventors: Saihua Lin, Jonghoon Choi
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Publication number: 20160373064Abstract: A transceiver configured to transmit data in a plurality of operating modes including a Wi-Fi mode and two or more different Bluetooth power modes, the transceiver comprising: a first power amplifier configured to amplify Bluetooth signals; a second power amplifier configured to amplify Wi-Fi signals; an antenna coupled to the second power amplifier; and a tunable load circuit, coupled between the first amplifier and the second amplifier, configured to provide a different load impedance for each of the plurality of operating modes, the tunable load circuit consisting of: two impedance paths coupled in parallel between output terminals of the first and second amplifiers; and a number of shunt paths coupled between the tunable load circuit and ground potential.Type: ApplicationFiled: June 19, 2015Publication date: December 22, 2016Inventors: Saihua Lin, Jonghoon Choi
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Patent number: 9509256Abstract: An apparatus includes: a plurality of amplification stages, each stage comprising a cascode transistor; and a bridge circuit coupled between gate terminals of cascode transistors in two adjacent stages of the plurality of amplification stages, the bridge circuit including a plurality of diodes.Type: GrantFiled: July 29, 2014Date of Patent: November 29, 2016Assignee: QUALCOMM IncorporatedInventors: Saihua Lin, Anup Savla
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Patent number: 9490886Abstract: Exemplary embodiments are directed to a beamforming device. A device may include at least one receive path; and an amplifier coupled to an output of each receive path. The device configured to process each a signal from each receive path in at least one of a voltage domain and a current domain.Type: GrantFiled: February 27, 2012Date of Patent: November 8, 2016Assignee: QUALCOMM IncorporatedInventor: Saihua Lin
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Patent number: 9473101Abstract: An amplifier is disclosed that may include a filter, such as a notch-filter, to filter an output signal provided by the amplifier. The included filter may suppress and/or reduce a gain of the amplifier for a particular range of frequencies. In one embodiment, a frequency response of the filter may be determined by one or more reactive components included within the amplifier. In at least one embodiment, the amplifier may include two or more mutual inductors to reduce the gain of the amplifier when operated at or near a predetermined frequency. In another embodiment, the amplifier may include one or more variable capacitors that may enable the frequency response of the filter to be changed and/or modified.Type: GrantFiled: February 9, 2015Date of Patent: October 18, 2016Assignee: QUALCOMM IncorporatedInventors: Alan Ngar Loong Chan, Saihua Lin
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Publication number: 20160248460Abstract: A method and apparatus are disclosed for generating a quadrature signal that may be used to modulate and/or demodulate communication signals transmitted between communication devices. A quadrature signal generator may include a control block, a mixer, and a filter. The control block may generate a reference signal and a filter control signal based on an input clock signal. The mixer may generate a mixer output signal based on the input clock signal and the reference signal. The filter, controlled by the filter control signal, may filter the mixer output signal to suppress a band of frequencies within the mixer output signal.Type: ApplicationFiled: February 19, 2015Publication date: August 25, 2016Inventors: Saihua Lin, Jianlei Shi
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Publication number: 20160233843Abstract: An amplifier is disclosed that may include a filter, such as a notch-filter, to filter an output signal provided by the amplifier. The included filter may suppress and/or reduce a gain of the amplifier for a particular range of frequencies. In one embodiment, a frequency response of the filter may be determined by one or more reactive components included within the amplifier. In at least one embodiment, the amplifier may include two or more mutual inductors to reduce the gain of the amplifier when operated at or near a predetermined frequency. In another embodiment, the amplifier may include one or more variable capacitors that may enable the frequency response of the filter to be changed and/or modified.Type: ApplicationFiled: February 9, 2015Publication date: August 11, 2016Inventors: Alan Ngar Loong Chan, Saihua Lin