Patents by Inventor Sheng-Lyang Jang
Sheng-Lyang Jang 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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Patent number: 8305116Abstract: An injection-locked frequency dividing apparatus including a frequency multiplier, a first linear mixer, a second linear mixer, and an oscillator is disclosed. The frequency multiplier receives a frequency signal and generates a multiple-frequency signal accordingly. The first and the second linear mixer both receive the multiple-frequency signal and respectively receive a first input signal and a second input signal, wherein the phases of the first and the second input signal are complementary. The first and the second linear mixer respectively mix the multiple-frequency signal with the first and the second input signal to respectively generate a first mixed signal and a second mixed signal. The oscillator generates the frequency signal. The oscillator further receives the first and the second mixed signal and generates a first output signal and a second output signal accordingly, wherein the phases of the first and the second output signal are complementary.Type: GrantFiled: January 26, 2011Date of Patent: November 6, 2012Assignee: National Taiwan University of Science and TechnologyInventors: Sheng-Lyang Jang, Yu-Sheng Chen, Chia-Wei Chang, Cheng-Chen Liu
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Publication number: 20120062287Abstract: An injection-locked frequency dividing apparatus including a frequency multiplier, a first linear mixer, a second linear mixer, and an oscillator is disclosed. The frequency multiplier receives a frequency signal and generates a multiple-frequency signal accordingly. The first and the second linear mixer both receive the multiple-frequency signal and respectively receive a first input signal and a second input signal, wherein the phases of the first and the second input signal are complementary. The first and the second linear mixer respectively mix the multiple-frequency signal with the first and the second input signal to respectively generate a first mixed signal and a second mixed signal. The oscillator generates the frequency signal. The oscillator further receives the first and the second mixed signal and generates a first output signal and a second output signal accordingly, wherein the phases of the first and the second output signal are complementary.Type: ApplicationFiled: January 26, 2011Publication date: March 15, 2012Applicant: National Taiwan University of Science and TechnoloyInventors: Sheng-Lyang Jang, Yu-Sheng Chen, Chia-Wei Chang, Cheng-Chen Liu
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Patent number: 8035456Abstract: A VCO comprising a cross-coupled transistors module and a resonant module is provided. The resonant module comprises a first transistor, second transistor, a first inductor and varactor string and a second inductor and varactor string. The first source/drain terminal of the first transistor coupled to the second reference voltage, the second source/drain terminal of the first transistor coupled to the cross-coupled transistors module and the gate terminal coupled to a bias voltage. The first source/drain terminal of the second transistor coupled to the second reference voltage, the second source/drain terminal of the second transistor coupled to the cross-coupled transistors module and the gate terminal of the second transistor coupled to the bias voltage. The first and second inductor and varactor strings coupled between the gate of the first and second transistors and a tuning voltage in serial, separately.Type: GrantFiled: April 1, 2010Date of Patent: October 11, 2011Assignee: National Taiwan University of Science and TechnologyInventors: Sheng-Lyang Jang, Cheng-Chen Liu, Yi-Jhe Song
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Publication number: 20110241788Abstract: A VCO comprising a cross-coupled transistors module and a resonant module is provided. The resonant module comprises a first transistor, second transistor, a first inductor and varactor string and a second inductor and varactor string. The first source/drain terminal of the first transistor coupled to the second reference voltage, the second source/drain terminal of the first transistor coupled to the cross-coupled transistors module and the gate terminal coupled to a bias voltage. The first source/drain terminal of the second transistor coupled to the second reference voltage, the second source/drain terminal of the second transistor coupled to the cross-coupled transistors module and the gate terminal of the second transistor coupled to the bias voltage. The first and second inductor and varactor strings coupled between the gate of the first and second transistors and a tuning voltage in serial, separately.Type: ApplicationFiled: April 1, 2010Publication date: October 6, 2011Applicant: National Taiwan University of Science and TechnologyInventors: Sheng-Lyang Jang, Cheng-Chen Liu, Yi-Jhe Song
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Patent number: 7920030Abstract: A multi-phase voltage-control oscillator including a first voltage-control oscillator circuit and a second voltage-control oscillator circuit is provided. The second voltage-control oscillator circuit and the first voltage-control oscillator circuit have a plurality of inductors, and the inductors in the second voltage-control oscillator circuit are respectively cross-coupled with the inductors in the first voltage-control oscillator circuit to generate a mutual inductance effect, so as to output a plurality of oscillating signals with different phases.Type: GrantFiled: April 29, 2009Date of Patent: April 5, 2011Assignee: National Taiwan University of Science and TechnologyInventors: Sheng-Lyang Jang, Yun-Hsueh Chuang, Ren-Hong Yen, Shao-Hua Lee
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Patent number: 7782101Abstract: An injection-locked frequency divider for dividing a frequency of an injection signal and obtaining a frequency divided signal is provided. The injection-locked frequency divider includes a signal injection unit and an oscillator. The signal injection unit includes a first input terminal and a second input terminal for receiving the injection signal. The received injection signal exhibits a phase difference of 180° between the first input terminal and the second input terminal. The oscillator includes an inductor unit and a variable capacitance unit. The injection-locked frequency divider is featured with a wide injection locking range, and can be realized with a low operation voltage, and therefore can be conveniently used in different kinds of hybrid ICs.Type: GrantFiled: June 30, 2008Date of Patent: August 24, 2010Assignee: National Taiwan University of Science and TechnologyInventors: Sheng-Lyang Jang, Cheng-Chen Liu
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Patent number: 7710211Abstract: An injection-locked frequency divider includes a signal injection circuit and colpitts VCO. The signal injection circuit is for injecting an injection signal. The colpitts VCO includes first and second transistors, first and second LC tank circuits and a cross-coupled transistor pair. The first terminals of the first and second transistors receive the injection signal. The first and second LC tank circuits are for determining resonance frequency of an oscillation signal of the colpitts VCO. The cross-coupled transistor pair includes third and fourth transistors. The control terminals of the third and fourth transistors are respectively coupled to first terminals of the fourth and third transistors. The first terminals of the third and fourth transistors are respectively coupled to a first terminal or control terminal of the first and second transistors for providing an equivalent negative resistance. The injection signal and oscillation signal are mixed in frequency to generate differential output signals.Type: GrantFiled: January 3, 2008Date of Patent: May 4, 2010Assignee: National Taiwan University of Science and TechnologyInventors: Sheng-Lyang Jang, Chien-Feng Lee
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Patent number: 7705686Abstract: An injection-locked frequency divider includes a ring oscillator, a signal injection circuit, a first adjustable load circuit and a second adjustable load circuit. The ring oscillator generates an oscillation signal according to a differential signal outputted by the signal injection circuit. According to an adjustable voltage, the first and second adjustable load circuits can respectively change equivalent impedances of the first adjustable load circuit and the second adjustable load circuit so that a free-running frequency of the oscillation signal of the ring oscillator is adjusted and an injection-locked frequency range of the injection-locked frequency divider is expanded.Type: GrantFiled: November 21, 2007Date of Patent: April 27, 2010Assignee: National Taiwan University of Science and TechnologyInventors: Sheng-Lyang Jang, Yun-Hsueh Chuang, Shao-Hwa Lee
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Patent number: 7683681Abstract: An injection-locked frequency divider is provided. The injection-locked frequency divider includes an active inductor unit, a source injection unit, a first transistor and a second transistor. The injection-locked frequency divider generates a frequency-divided signal having a half frequency of the signal source. A locking frequency range of the injection-locked frequency divider is determined by a quality factor of a resonant cavity. A quality factor of the active inductor unit is lower than a conventional spiral inductor because the active inductor unit is composed of active elements. In the injection-locked frequency divider, the active inductor unit is used to instead of the conventional spiral inductor, so that the chip area can be reduced and the locking frequency range of the injection-locked frequency divider can be increased. Further, an induction value of the active inductor unit can be altered to change the locking frequency range of the injection-locked frequency divider.Type: GrantFiled: December 12, 2007Date of Patent: March 23, 2010Assignee: National Taiwan University of Science and TechnologyInventors: Sheng-Lyang Jang, Cheng-Chen Liu, Jui-Cheng Han
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Patent number: 7659784Abstract: An injection-locked frequency divider is provided. The injection-locked frequency divider includes a voltage control oscillator (VCO) and a mixer. The VCO includes a LC resonance tank and a negative-resistance generator for generating a differential oscillation signal including a first and a second oscillation signals. The LC resonance tank adjusts a VCO reactance and resonates for generating the differential oscillation signal. The negative-resistance generator coupled to the LC resonance tank eliminates an equivalent resistance generated by the LC resonance tank and maintains the VCO to continuously oscillate.Type: GrantFiled: December 28, 2007Date of Patent: February 9, 2010Assignee: National Taiwan University of Science and TechnologyInventors: Sheng-Lyang Jang, Cheng-Chen Liu
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Publication number: 20090251177Abstract: An injection-locked frequency divider for dividing a frequency of an injection signal and obtaining a frequency divided signal is provided. The injection-locked frequency divider includes a signal injection unit and an oscillator. The signal injection unit includes a first input terminal and a second input terminal for receiving the injection signal. The received injection signal exhibits a phase difference of 180° between the first input terminal and the second input terminal. The oscillator includes an inductor unit and a variable capacitance unit. The injection-locked frequency divider is featured with a wide injection locking range, and can be realized with a low operation voltage, and therefore can be conveniently used in different kinds of hybrid ICs.Type: ApplicationFiled: June 30, 2008Publication date: October 8, 2009Applicant: National Taiwan University of Science and TechnologyInventors: Sheng-Lyang Jang, Cheng-Chen Liu
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Publication number: 20090231047Abstract: A multi-phase voltage-control oscillator including a first voltage-control oscillator circuit and a second voltage-control oscillator circuit is provided. The second voltage-control oscillator circuit and the first voltage-control oscillator circuit have a plurality of inductors, and the inductors in the second voltage-control oscillator circuit are respectively cross-coupled with the inductors in the first voltage-control oscillator circuit to generate a mutual inductance effect, so as to output a plurality of oscillating signals with different phases.Type: ApplicationFiled: April 29, 2009Publication date: September 17, 2009Applicant: National Taiwan University of Science and TechnologyInventors: Sheng-Lyang Jang, Yun-Hsueh Chuang, Ren-Hong Yen, Shao-Hua Lee
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Patent number: 7589598Abstract: The present invention discloses a dual-band voltage controlled oscillator (VCO), comprising a plurality of resonant circuits; an inductor module; a plurality of switches of current source; a buffer circuit; and a output port. The dual-band voltage controlled oscillator (VCO) according to the invention uses the current source in such two VCOs with different resonant frequencies as the switch device to combine the two VCOs and uses the common inductor module for the two VCOs to save the chip size.Type: GrantFiled: November 30, 2006Date of Patent: September 15, 2009Assignee: National Taiwan University of Science & TechnologyInventors: Sheng Lyang Jang, Shao Hua Li
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Patent number: 7557668Abstract: An injection-locked frequency divider is provided. The injection-locked frequency divider includes a variable reactance unit, a signal injection unit, a first switch, a second switch, a first transformer, and a second transformer. The variable reactance unit, the first switch, the second switch, the first transformer, and the second transformer form a transformer-based LC-tank oscillator. The signal injection unit receives an injection signal. When the injection-locked frequency divider is in a locked state, the transformer-based LC-tank oscillator outputs a frequency division signal. Employing the feedback action of the first transformer and the second transformer, the present invention not only has a wide locking range but also promotes the realization of the low operating voltage.Type: GrantFiled: November 19, 2006Date of Patent: July 7, 2009Assignee: National Taiwan University of Science and TechnologyInventors: Sheng-Lyang Jang, Yun-Hsueh Chuang, Ren-Hong Yen, Shao-Hwa Lee
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Patent number: 7551038Abstract: A multi-phase voltage-control oscillator including a first voltage-control oscillator circuit and a second voltage-control oscillator circuit is provided. The first voltage-control oscillator circuit includes a first LC tank and a first inductor assembly unit. The second voltage-control oscillator circuit includes a second LC tank and a second inductor assembly unit. A mutual inductance effect is generated between the inductors of the first voltage-control oscillator and the inductors of the second voltage-control oscillator.Type: GrantFiled: December 28, 2006Date of Patent: June 23, 2009Assignee: National Taiwan University of Science and TechnologyInventors: Sheng-Lyang Jang, Yun-Hsueh Chuang, Ren-Hong Yen, Shao-Hua Lee
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Patent number: 7545230Abstract: A voltage control oscillator (VCO) includes a VCO circuit and a back-gate coupling circuit, wherein the VCO circuit includes at least a first transistor, a second transistor and a resonant cavity formed by an inductor and a capacitor. The back-gate coupling circuit is formed by a plurality of capacitors and a plurality of resistors. In the embodiments of the present invention, the capacitors are coupled to the back-gate terminals of the first transistor and the second transistor, so as to reduce the power consumption and the phase noise of the VCO.Type: GrantFiled: February 5, 2007Date of Patent: June 9, 2009Assignee: National Taiwan University of Science and TechnologyInventors: Sheng-Lyang Jang, Shao-Hua Lee, Yun-Hsueh Chuang, Chung-Ching Chiu
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Publication number: 20090102565Abstract: An injection-locked frequency divider is provided. The injection-locked frequency divider includes a voltage control oscillator (VCO) and a mixer. The VCO includes a LC resonance tank and a negative-resistance generator for generating a differential oscillation signal including a first and a second oscillation signals. The LC resonance tank adjusts a VCO reactance and resonates for generating the differential oscillation signal. The negative-resistance generator coupled to the LC resonance tank eliminates an equivalent resistance generated by the LC resonance tank and maintains the VCO to continuously oscillate.Type: ApplicationFiled: December 28, 2007Publication date: April 23, 2009Applicant: National Taiwan University of Science and TechnologyInventors: Sheng-Lyang Jang, Cheng-Chen Liu
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Patent number: 7522008Abstract: An injection locked frequency divider includes a ring oscillator, a first injection unit and a second injection unit. The ring oscillator includes a first delay cell and a second delay cell each including differential input terminals and differential output terminals. The differential input terminals and the differential output terminals of the first delay cell are respectively coupled to the differential output terminals and the differential input terminals of the second delay cell. The first injection unit connected between the differential output terminals of the first delay cell receives and injects a first injection signal to the differential output terminals of the first delay cell. The second injection unit connected between the differential output terminals of the second delay cell receives and injects a second injection signal to the differential output terminals of the second delay cell.Type: GrantFiled: August 21, 2007Date of Patent: April 21, 2009Assignee: National Taiwan University of Science & TechnologyInventors: Sheng-Lyang Jang, Chun-Chieh Chao, Yun-Hsueh Chang, Shao-Hwa Lee
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Patent number: 7522007Abstract: An injection locked frequency divider includes a signal injection unit, a Hartley voltage controlled oscillator and a biasing unit. The signal injection unit and the biasing unit output an injection signal to the Hartley voltage controlled oscillator to bias the Hartley voltage controlled oscillator. The Hartley voltage controlled oscillator, which includes a first transistor, a second transistor and a LC tank, receives the injection signal and outputs a differential output signal through a first output terminal and a second output terminal. First terminals of the first and second transistors are respectively coupled to the first and second output terminals, and second terminals of the first and second transistors are coupled to a first node. The LC tank decides a resonant frequency of the Hartley voltage controlled oscillator and serves as a positive feedback circuit for the first and second transistors.Type: GrantFiled: August 21, 2007Date of Patent: April 21, 2009Assignee: National Taiwan University of Science & TechnologyInventors: Sheng-Lyang Jang, Yun-Hsueh Chuang, Shao-Hwa Lee
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Publication number: 20090085682Abstract: An injection-locked frequency divider includes a signal injection circuit and colpitts VCO. The signal injection circuit is for injecting an injection signal. The colpitts VCO includes first and second transistors, first and second LC tank circuits and a cross-coupled transistor pair. The first terminals of the first and second transistors receive the injection signal. The first and second LC tank circuits are for determining resonance frequency of an oscillation signal of the colpitts VCO. The cross-coupled transistor pair includes third and fourth transistors. The control terminals of the third and fourth transistors are respectively coupled to first terminals of the fourth and third transistors. The first terminals of the third and fourth transistors are respectively coupled to a first terminal or control terminal of the first and second transistors for providing an equivalent negative resistance. The injection signal and oscillation signal are mixed in frequency to generate differential output signals.Type: ApplicationFiled: January 3, 2008Publication date: April 2, 2009Applicant: National Taiwan University of Science and TechnologyInventors: Sheng-Lyang Jang, Chien-Feng Lee