Patents by Inventor Shey-shi Lu

Shey-shi Lu 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).

  • Publication number: 20080315957
    Abstract: An ultra wideband low noise amplifier (UWB LNA) and amplification method thereof, providing a substantially achieved bandwidth extension by pole-zero cancellation and utilized to transform input impedance matching up to 50 ohm for gaining low noise figure. The ultra-wideband low noise amplifier is composed of a capacitive-feedback amplifier, a resistive-feedback amplifier, an inductive-feedback amplifier, and a buffer amplifier.
    Type: Application
    Filed: June 20, 2007
    Publication date: December 25, 2008
    Inventors: Yu Tso Lin, Shey Shi Lu
  • Patent number: 7466205
    Abstract: An ultra wideband low noise amplifier (UWB LNA) and amplification method thereof, providing a substantially achieved bandwidth extension by pole-zero cancellation and utilized to transform input impedance matching up to 50 ohm for gaining low noise figure. The ultra-wideband low noise amplifier is composed of a capacitive-feedback amplifier, a resistive-feedback amplifier, an inductive-feedback amplifier, and a buffer amplifier.
    Type: Grant
    Filed: June 20, 2007
    Date of Patent: December 16, 2008
    Assignee: National Taiwan University
    Inventors: Yu Tso Lin, Shey Shi Lu
  • Publication number: 20080224789
    Abstract: In a phase locked loop (PLL), phase shifters shift a phase of an input signal. Based on the phases of the input signal, the shifted signals, and a frequency division output signal, phase frequency detectors (PFDs) generate phase difference signals. In response to the phase difference signals, charge pumps (CPs) control output voltages thereof. Based on the output voltages of the CPs, a voltage controlled oscillator (VCO) outputs an output signal. A frequency divider divides the frequency of the output signal from the VCO to generate the frequency division output signal. A circulator outputs the frequency division output signal to one of the PFDs at a proper timing. A modulator reduces quantization errors of the frequency divider.
    Type: Application
    Filed: March 14, 2007
    Publication date: September 18, 2008
    Applicants: UNITED MICROELECTRONICS CORP., NATIONAL TAIWAN UNIVERSITY
    Inventors: Jen-Chung Chang, Chia-Jung Hsu, Shey-Shi Lu, Yu-Che Yang, Tsung-Chien Wu, Tzu-Chao Lin
  • Publication number: 20080185679
    Abstract: An inductor layout and manufacturing method thereof are provided. The inductor layout includes a substrate and a conductive path. The substrate includes at least an active region, wherein the active region includes at least a circuit. The conductive path is disposed over the substrate and arranged near the edge of the active region along the direction of the edge of the active region. Wherein, two ends of the conductive path are the two ends of the inductor.
    Type: Application
    Filed: October 19, 2006
    Publication date: August 7, 2008
    Applicants: UNITED MICROELECTRONICS CORP., NATIONAL TAIWAN UNIVERSITY
    Inventors: Tsun-Lai Hsu, Hsiao-Chin Chen, Shey-Shi Lu, Jen-Chung Chang, Chia-Jung Hsu
  • Publication number: 20080188196
    Abstract: An adapter for RF front end processor chip wherein the RF front end processor chip includes a low noise amplifier which is used to receive a RF filter signal so as to generate a first signal. An adapter is used to receive a first signal so as to induce and generate a second signal and a third signal which is electrically reverse. Then a frequency mixer of the RF front end processor chip is used to receive the second signal and the third signal and a resonant signal, the second signal and the third signal are used to generate a medium frequency signal.
    Type: Application
    Filed: February 7, 2007
    Publication date: August 7, 2008
    Inventors: Hsien-Ku Chen, Shey-Shi Lu, Da-Chiang Chang, Ying-Zong Juang, Chin-Fong Chiu
  • Publication number: 20080032659
    Abstract: A sub-harmonic mixer and a down converter with the sub-harmonic mixer are provided. The sub-harmonic mixer includes a differential amplifying unit, a current buffer unit, and a switching unit. The differential amplifying unit is used to amplify a radio frequency (RF) signal and employs a first resonance circuit to force a leakage signal to flow to a first voltage. The current buffer unit is used to amplify the gain of an output signal of the differential amplifying unit and employs a second resonance circuit to force the leakage signal to flow to a second voltage. Finally, the switching unit switches an output signal of the current buffer unit into a base band signal.
    Type: Application
    Filed: July 18, 2006
    Publication date: February 7, 2008
    Applicants: UNITED MICROELECTRONICS CORP., NATIONAL TAIWAN UNIVERSITY
    Inventors: Jen-Chung Chang, Chia-Jung Hsu, Shey-Shi Lu, Hsiao-Chin Chen, Tzu-Chao Lin
  • Publication number: 20080009259
    Abstract: A frequency-converting circuit and a down converter with the frequency-converting circuit are disclosed. The above-mentioned frequency-converting circuit is used for converting an RF signal into a first baseband signal according to a poly-phase LO signal. The frequency-converting circuit includes a coupler, a first transduction unit and a first switching unit. The coupler is for receiving and splitting the RF signal and delivering a first RF signal via the first output terminal thereof. The first transduction unit is for amplifying the first RF signal. The first switching unit is for performing switching operations on the output signal of the first transduction unit and producing the first baseband signal.
    Type: Application
    Filed: July 10, 2006
    Publication date: January 10, 2008
    Inventors: Jen-Chung Chang, Chia-Jung Hsu, Shey-Shi Lu, Hsiao-Chin Chen, Yu-Yee Liow
  • Publication number: 20070147571
    Abstract: The provided fractional frequency divider includes a divider controlling unit for generating a divider selection signal in response to a dual-edge triggering of an input signal and a frequency dividing unit coupled to the divider controlling unit for dividing the frequency of the input signal by one of an integer and a fractional dividers in response to the dual-edge triggering and the divider selection signal to generate the output signal of the fractional frequency divider. An operation of the frequency dividing unit is not suppressed when the integer divider is employed, the operation of the frequency dividing unit is not suppressed for a period of the input signal and is suppressed for half of that period, and this cycle is kept on recurring when the fractional divider is employed. The fractional-n PLL having the fractional frequency divider is also provided.
    Type: Application
    Filed: October 30, 2006
    Publication date: June 28, 2007
    Applicants: Memetics Technology Co., Ltd., National Taiwan University
    Inventors: Shih-An Yu, Yu-Che Yang, Shey-shi Lu
  • Patent number: 6949979
    Abstract: The designing method and circuits for a multi-band electronic circuit having at least one transistor have been proposed. The proposed method includes steps of: (a) changing the capacitance between the input terminal and the output terminal of the transistor of the circuit, and (b) obtaining the resonant frequency of the circuit in response to the changed capacitance for switching among multiple bands. The designing method and circuits for a multi-band amplifier, which includes at least one transistor having an input terminal and an inductor electrically connected to the input terminal of the transistor, have been proposed too. The designing method for a multi-band amplifier includes steps of: changing the bias of the transistor, and switching the resonant frequency of the input impedance of the transistor and the inductor in response to the changed bias for switching among multiple bands.
    Type: Grant
    Filed: November 26, 2003
    Date of Patent: September 27, 2005
    Assignees: Memetics Technology Co. LTD, National Taiwan University
    Inventors: Shey-shi Lu, Hung-Wei Chiu, Po-Wei Lee, Yu-Che Yang
  • Patent number: 6906599
    Abstract: The designing methods for an impedance matching are provided which include steps of: connecting in parallel a capacitor to a collector/drain of a bipolar/field effect transistor having a common-emitter configuration, and obtaining a desired resistance at a base/gate of the bipolar/field effect transistor due to a feedback effect for achieving the impedance matching. The circuits for an impedance matching are also provided which include: a first bipolar/field effect transistor, an inductor, a first resistor, a power supply, a capacitor, a second bipolar/field effect transistor, a second resistor, and a third resistor, wherein a desired resistance is produced in the input impedance looking into the base/gate of the first bipolar/field effect transistor through an equivalent parallel combination of an capacitor and an resistor produced at the base/gate of the second bipolar/field effect transistor so as to achieve the impedance matching.
    Type: Grant
    Filed: October 3, 2003
    Date of Patent: June 14, 2005
    Assignees: Memetics Technology, Co., Ltd., National Taiwan University
    Inventor: Shey-shi Lu
  • Publication number: 20040119556
    Abstract: The designing methods for an impedance matching are provided which include steps of: connecting in parallel a capacitor to a collector/drain of a bipolar/field effect transistor having a common-emitter configuration, and obtaining a desired resistance at a base/gate of the bipolar/field effect transistor due to a feedback effect for achieving the impedance matching. The circuits for an impedance matching are also provided which include: a first bipolar/field effect transistor, an inductor, a first resistor, a power supply, a capacitor, a second bipolar/field effect transistor, a second resistor, and a third resistor, wherein a desired resistance is produced in the input impedance looking into the base/gate of the first bipolar/field effect transistor through an equivalent parallel combination of an capacitor and an resistor produced at the base/gate of the second bipolar/field effect transistor so as to achieve the impedance matching.
    Type: Application
    Filed: October 3, 2003
    Publication date: June 24, 2004
    Applicants: Memetics Technology Co., Ltd., National Taiwan University
    Inventor: Shey-shi Lu
  • Publication number: 20040111681
    Abstract: The designing method and circuits for a multi-band electronic circuit having at least one transistor have been proposed. The proposed method includes steps of: (a) changing the capacitance between the input terminal and the output terminal of the transistor of the circuit, and (b) obtaining the resonant frequency of the circuit in response to the changed capacitance for switching among multiple bands. The designing method and circuits for a multi-band amplifier, which includes at least one transistor having an input terminal and an inductor electrically connected to the input terminal of the transistor, have been proposed too. The designing method for a multi-band amplifier includes steps of: changing the bias of the transistor, and switching the resonant frequency of the input impedance of the transistor and the inductor in response to the changed bias for switching among multiple bands.
    Type: Application
    Filed: November 26, 2003
    Publication date: June 10, 2004
    Applicants: Memetics Technology Co., Ltd., National Taiwan University
    Inventors: Shey-Shi Lu, Hung-Wei Chiu, Po-Wei Lee, Yu-Che Yang
  • Patent number: 5891351
    Abstract: A method for forming a pattern on a surface of a steel substrate includes the formation of a patterned mask on the surface of the steel substrate. The entire surface having the patterned mask is etched by reactive ion etching such the a pattern is formed on the surface of the steel substrate. The reactive ion etching is brought about by a plasma which is produced in an atmosphere of a chlorine-containing compound, under pressure of 1-100 mTorr, and with a radio frequency power of 100-600 W.
    Type: Grant
    Filed: August 13, 1997
    Date of Patent: April 6, 1999
    Assignee: National Science Council
    Inventors: Chih-Kung Lee, Hong-Zong Liao, Shey-Shi Lu, Nien-Show Ho