Patents by Inventor Jianyun Hu

Jianyun Hu 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).

  • Patent number: 9998129
    Abstract: A phase continuity architecture is provided to maintain the phase continuity for a post divider output signal from a post divider that post divides a PLL output signal. A pulse swallower removes a pulse from the PLL output signal responsive to an edge is a divided feedback clock signal. A sampler samples the post divider output signal responsive to a detection of the missing pulse to determine a phase relationship between the post divider output signal and the divided feedback clock signal.
    Type: Grant
    Filed: September 21, 2017
    Date of Patent: June 12, 2018
    Assignee: QUALCOMM Incorporated
    Inventors: Jingcheng Zhuang, Jianyun Hu, Animesh Paul, Xinhua Chen, Frederic Bossu
  • Patent number: 9331704
    Abstract: An apparatus for generating an oscillating output signal includes an inductive-capacitive (LC) circuit and a current tuning circuit. The LC circuit includes a primary inductor and a varactor coupled to the primary inductor. A capacitance of the varactor is responsive to a voltage at a control input of the varactor. The current tuning circuit includes a secondary inductor and a current driving circuit coupled to the secondary inductor. The current driving circuit is responsive to a current at a control input of the current driving circuit. An effective inductance of the primary inductor is adjustable via magnetic coupling to the secondary inductor, and a frequency of the oscillating output signal is responsive to the effective inductance of the primary inductor and to the capacitance of the varactor.
    Type: Grant
    Filed: February 1, 2013
    Date of Patent: May 3, 2016
    Assignee: QUALCOMM INCORPORATED
    Inventors: Yiwu Tang, Jianyun Hu, Chiewcharn Narathong
  • Patent number: 9130666
    Abstract: Receiver circuits that can be reconfigured to generate test signals in a wireless device are disclosed. In an exemplary design, an apparatus includes a mixer and an amplifier. The mixer downconverts an input radio frequency (RF) signal based on a local oscillator (LO) signal in a first mode. The amplifier, which is formed by at least a portion of the mixer, amplifies the LO signal and provides an amplified LO signal in a second mode. In another exemplary design, an apparatus includes an amplifier and an attenuator. The amplifier receives and amplifies an input RF signal in a first mode. The attenuator, which is formed by at least a portion of the amplifier, receives and passes an LO signal in a second mode.
    Type: Grant
    Filed: June 12, 2014
    Date of Patent: September 8, 2015
    Assignee: QUALCOMM Incorporated
    Inventors: Lai Kan Leung, Chiewcharn Narathong, Jianyun Hu, Yunfei Feng
  • Patent number: 9059686
    Abstract: In one example, a high-speed divider includes two identical pseudo-CML latches and four output inverters. Each latch includes a pair of cross-coupled signal holding transistors. A first P-channel pull-up circuit pulls up on a second output node QB of the latch. A second P-channel pull-up circuit pulls up on a first output node Q of the latch. A pull-down circuit involves four N-channel transistors. This pull-down circuit: 1) couples the QB node to ground when a clock signal CK is high and a data signal D is high, 2) couples the Q node to ground when CK is high and D is low, 3) prevents a transfer of charge between the QB and Q nodes through the pull-down circuit when D transitions during a time period when CK is low, and 4) decouples the QB and Q nodes from the pull-down circuit when CK is low.
    Type: Grant
    Filed: June 25, 2013
    Date of Patent: June 16, 2015
    Assignee: QUALCOMM Incorporated
    Inventors: Wu-Hsin Chen, Li Liu, Jianyun Hu
  • Publication number: 20150118980
    Abstract: Certain aspects of the present disclosure provide methods and apparatus for calibrating a transceiver for wireless communications. One example method generally includes configuring a first oscillating signal as an input signal to at least a portion of a receiver (RX) path, calibrating a residual sideband (RSB) of the receiver path using a second oscillating signal as a local oscillating signal for the receiver path, and calibrating an RSB of a transmitter (TX) path by routing an output of the transmitter path to the receiver path, after calibrating the RSB of the receiver path. Another example method generally includes routing an output of a transmitter path to a receiver path, using a first local oscillating signal for the transmitter path, using a second local oscillating signal for the receiver path, and measuring an output of the receiver path as a local oscillator (LO) leakage for the transmitter path.
    Type: Application
    Filed: April 29, 2014
    Publication date: April 30, 2015
    Applicant: QUALCOMM INCORPORATED
    Inventors: Lai Kan LEUNG, Chiewcharn NARATHONG, Jianyun HU
  • Publication number: 20140375367
    Abstract: In one example, a high-speed divider includes two identical pseudo-CML latches and four output inverters. Each latch includes a pair of cross-coupled signal holding transistors. A first P-channel pull-up circuit pulls up on a second output node QB of the latch. A second P-channel pull-up circuit pulls up on a first output node Q of the latch. A pull-down circuit involves four N-channel transistors. This pull-down circuit: 1) couples the QB node to ground when a clock signal CK is high and a data signal D is high, 2) couples the Q node to ground when CK is high and D is low, 3) prevents a transfer of charge between the QB and Q nodes through the pull-down circuit when D transitions during a time period when CK is low, and 4) decouples the QB and Q nodes from the pull-down circuit when CK is low.
    Type: Application
    Filed: June 25, 2013
    Publication date: December 25, 2014
    Inventors: Wu-Hsin Chen, Li Liu, Jianyun Hu
  • Publication number: 20140295783
    Abstract: Receiver circuits that can be reconfigured to generate test signals in a wireless device are disclosed. In an exemplary design, an apparatus includes a mixer and an amplifier. The mixer downconverts an input radio frequency (RF) signal based on a local oscillator (LO) signal in a first mode. The amplifier, which is formed by at least a portion of the mixer, amplifies the LO signal and provides an amplified LO signal in a second mode. In another exemplary design, an apparatus includes an amplifier and an attenuator. The amplifier receives and amplifies an input RF signal in a first mode. The attenuator, which is formed by at least a portion of the amplifier, receives and passes an LO signal in a second mode.
    Type: Application
    Filed: June 12, 2014
    Publication date: October 2, 2014
    Inventors: Kan Lai Leung, Chiewcharn Narathong, Jianyun Hu, Yunfei Feng
  • Publication number: 20140218124
    Abstract: An apparatus for generating an oscillating output signal includes an inductive-capacitive (LC) circuit and a current tuning circuit. The LC circuit includes a primary inductor and a varactor coupled to the primary inductor. A capacitance of the varactor is responsive to a voltage at a control input of the varactor. The current tuning circuit includes a secondary inductor and a current driving circuit coupled to the secondary inductor. The current driving circuit is responsive to a current at a control input of the current driving circuit. An effective inductance of the primary inductor is adjustable via magnetic coupling to the secondary inductor, and a frequency of the oscillating output signal is responsive to the effective inductance of the primary inductor and to the capacitance of the varactor.
    Type: Application
    Filed: February 1, 2013
    Publication date: August 7, 2014
    Applicant: QUALCOMM INCORPORATED
    Inventors: Yiwu Tang, Jianyun Hu, Chiewcharn Narathong
  • Patent number: 8774745
    Abstract: Receiver circuits that can be reconfigured to generate test signals in a wireless device are disclosed. In an exemplary design, an apparatus includes a mixer and an amplifier. The mixer downconverts an input radio frequency (RF) signal based on a local oscillator (LO) signal in a first mode. The amplifier, which is formed by at least a portion of the mixer, amplifies the LO signal and provides an amplified LO signal in a second mode. In another exemplary design, an apparatus includes an amplifier and an attenuator. The amplifier receives and amplifies an input RF signal in a first mode. The attenuator, which is formed by at least a portion of the amplifier, receives and passes an LO signal in a second mode.
    Type: Grant
    Filed: March 6, 2013
    Date of Patent: July 8, 2014
    Assignee: QUALCOMM Incorporated
    Inventors: Kan Lai Leung, Chiewcharn Narathong, Jianyun Hu, Yunfei Feng
  • Publication number: 20140162580
    Abstract: Receiver circuits that can be reconfigured to generate test signals in a wireless device are disclosed. In an exemplary design, an apparatus includes a mixer and an amplifier. The mixer downconverts an input radio frequency (RF) signal based on a local oscillator (LO) signal in a first mode. The amplifier, which is formed by at least a portion of the mixer, amplifies the LO signal and provides an amplified LO signal in a second mode. In another exemplary design, an apparatus includes an amplifier and an attenuator. The amplifier receives and amplifies an input RF signal in a first mode. The attenuator, which is formed by at least a portion of the amplifier, receives and passes an LO signal in a second mode.
    Type: Application
    Filed: March 6, 2013
    Publication date: June 12, 2014
    Applicant: QUALCOMM INCORPORATED
    Inventors: Kan Lai Leung, Chiewcharn Narathong, Jianyun Hu, Yunfei Feng