Patents by Inventor I-Hsiang Lin
I-Hsiang 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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Patent number: 8072289Abstract: High-frequency couplers and coupling techniques are described utilizing artificial composite right/left-handed transmission line (CRLH-TL). Three specific forms of couplers are described; (1) a coupled-line backward coupler is described with arbitrary tight/loose coupling and broad bandwidth; (2) a compact enhanced-bandwidth hybrid ring coupler is described with increased bandwidth and decreased size; and (3) a dual-band branch-line coupler that is not limited to a harmonic relation between the bands. These variations are preferably implemented in a microstrip fabrication process and may use lumped-element components. The couplers and coupling techniques are directed at increasing the utility while decreasing the size of high-frequency couplers, and are suitable for use with separate coupler or couplers integrated within integrated devices.Type: GrantFiled: May 16, 2008Date of Patent: December 6, 2011Assignee: The Regents of the University of CaliforniaInventors: Tatsuo Itoh, Christophe Caloz, I-Hsiang Lin, Hiroshi Okabe
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Publication number: 20110263071Abstract: The present invention provides a process for preparing a photoanode of a dye-sensitized solar cell (DSSC) by pressure swing impregnation, which includes impregnating a metal oxide layer on a conductive substrate in a photosensitizing dye solution in a vessel; introducing a pressurized inert gas into the vessel to maintain a first pressure therein for a period of time, wherein the first pressure can be lower or higher than the critical pressure of the inert gas and the solution is expanded by the inert gas; further pressurizing the vessel with the inert gas and maintaining at a second pressure higher than the first pressure for a period of time, wherein the inert gas becomes sub-critical or supercritical fluid and dissolves more in the solution, creating an anti-solvent effect, so that the photosensitizing dye further deposits onto the metal oxide layer due to the anti-solvent effect.Type: ApplicationFiled: August 10, 2010Publication date: October 27, 2011Applicant: National Tsing Hua UniversityInventors: Chung-Sung Tan, I-Hsiang Lin, Jan-Min Yang
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Publication number: 20110090023Abstract: High-frequency couplers and coupling techniques are described utilizing artificial composite right/left-handed transmission line (CRLH-TL). Three specific forms of couplers are described; (1) a coupled-line backward coupler is described with arbitrary tight/loose coupling and broad bandwidth; (2) a compact enhanced-bandwidth hybrid ring coupler is described with increased bandwidth and decreased size; and (3) a dual-band branch-line coupler that is not limited to a harmonic relation between the bands. These variations are preferably implemented in a microstrip fabrication process and may use lumped-element components. The couplers and coupling techniques are directed at increasing the utility while decreasing the size of high-frequency couplers, and are suitable for use with separate coupler or couplers integrated within integrated devices.Type: ApplicationFiled: May 16, 2008Publication date: April 21, 2011Applicant: THE REGENTS OF THE UNIVERSITY OF CALIFORNIAInventors: Tatsuo Itoh, Christophe Caloz, I-Hsiang Lin, Hiroshi Okabe
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Publication number: 20100330941Abstract: A frequency modulation (FM) transmitter implemented with a delta-sigma modulator and a phase-locked loop (PLL) is described. The delta-sigma modulator receives a modulating signal (e.g., an FM stereo multiplex (MPX) signal) and provides a modulator output signal. The PLL performs frequency modulation based on the modulator output signal and provides an FM signal. The FM transmitter may further include a gain/phase compensation unit and a scaling unit. The compensation unit may compensate the modulating signal for the closed-loop response of the PLL. The scaling unit may scale the amplitude of the modulating signal based on a gain to obtain a target frequency deviation for the FM signal. The PLL may operate in a transmit mode or a receive mode, may perform frequency modulation in the transmit mode, and may provide a local oscillator (LO) signal at a fixed frequency in the receive mode.Type: ApplicationFiled: June 26, 2009Publication date: December 30, 2010Applicant: QUALCOMM IncorporatedInventors: Pushp Trikha, Tzu-wang Pan, Eugene Yang, Yi Zeng, I-Hsiang Lin, Tg Vishwanath
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Publication number: 20100283551Abstract: A VCO (for example, in an FM receiver) includes an LC resonant tank. The LC resonant tank includes a coarse tuning capacitor bank and a fine tuning capacitor bank. The coarse tuning capacitor bank contains a plurality of digitally controlled coarse tuning capacitor elements, each providing a first capacitance value when active. The fine tuning capacitor bank contains a plurality of digitally controlled fine tuning capacitor elements, each providing a second capacitance value when active. To address the practical problem of capacitor mismatch, capacitance overlap throughout the VCO tuning range is created by selecting the first and second capacitance values such that the capacitance value of the fine capacitor bank is greater than the first capacitance value when all of the digitally controlled fine tuning capacitor elements of the fine capacitor bank are active.Type: ApplicationFiled: May 7, 2009Publication date: November 11, 2010Applicant: QUALCOMM IncorporatedInventors: Yi Zeng, Tzu-wang Pan, I-Hsiang Lin
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Publication number: 20100273442Abstract: A frequency synthesizer within an FM receiver employs a Phase-Locked Loop (PLL) to generate a Local Oscillator (LO) signal. The LO signal is supplied to a mixer. The FM receiver also includes jammer detection functionality. If no jammer is detected, then the loop bandwidth of the PLL is set to have a relatively high value, thereby favoring suppression of in-band residual FM. If a jammer is detected, then the loop bandwidth of the PLL is set to have a relatively low value, thereby favoring suppression of out-of-band SSB phase noise. By adaptively changing loop bandwidth depending on whether a jammer is detected, performance requirements on sub-circuits within the PLL can be relaxed while still satisfying in-band residual FM and out-of-band SSB phase noise requirements. By allowing the VCO of the PLL to generate more phase noise due to the adaptive changing of loop bandwidth, VCO power consumption can be reduced.Type: ApplicationFiled: April 26, 2009Publication date: October 28, 2010Applicant: QUALCOMM IncorporatedInventors: Yi Zeng, Tzu-wang Pan, I-Hsiang Lin, Jeremy Dunworth, Pushp Trikha, Rahul Apte
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Publication number: 20100255802Abstract: An FM radio with a wide frequency range operates in a cell phone without interfering with the VCO of the RF transceiver. The FM transceiver generates a VCO signal whose frequency varies by less than ±7% from the midpoint of a narrow first range. A synthesizer signal is generated by dividing the VCO frequency by a first divisor such that the synthesizer frequency varies over a lower frequency second range. The VCO frequency is also divided by a second divisor such that the synthesizer frequency varies over a third range. The upper limit of the second range falls at the lower limit of the third range. The lower limit of the second range is 85.5 MHz and the upper limit of the third range is 108.0 MHz. By also using a third divisor, a synthesizer signal with a range of 76-108 MHz is generated from the narrow first frequency range.Type: ApplicationFiled: April 2, 2009Publication date: October 7, 2010Applicant: QUALCOMM IncorporatedInventors: Tzu-wang Pan, Yi Zeng, I-Hsiang Lin, Pushp K. Trikha, Jeremy D. Dunworth, Rahul Apte
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Publication number: 20100124891Abstract: Exemplary embodiments include a frequency modulation (FM) transmitter and a non-FM receiver, which may be implemented on the same IC chip. The FM transmitter may include a digital FM modulator, a lowpass filter, an amplifier, and an LC tank circuit. The digital FM modulator may receive a digital input signal, perform FM modulation with the digital input signal, and provide a digital FM signal. The lowpass filter may filter the digital FM signal and provide a filtered FM signal. The amplifier may amplify the filtered FM signal and provide an output FM signal. The LC tank circuit may filter the output FM signal. The digital FM modulator may perform FM modulation by changing a variable divider ratio of a multi-modulus divider within a PLL. A delta-sigma modulator may receive the digital input signal and generate a modulator output signal used to obtain the variable divider ratio.Type: ApplicationFiled: November 19, 2008Publication date: May 20, 2010Applicant: QUALCOMM IncorporatedInventors: I-Hsiang Lin, Tzu-wang Pan, Yi Zeng
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Publication number: 20100085090Abstract: A clock clean-up phase-locked loop (PLL) that may reduce spurs and improve performance of a receiver is described. In one exemplary design, an integrated circuit includes a PLL and an analog-to-digital converter (ADC). The PLL receives a first clock signal generated with a fractional divider ratio and having spurs due to abrupt frequency jumps. The first clock signal may be generated by a fractional-N frequency synthesizer external to the integrated circuit. The PLL generates a second clock signal with an integer divider ratio and having reduced spurs. The ADC digitizes an analog baseband signal based on the second clock signal and provides digital samples. The integrated circuit may further include a low noise amplifier (LNA), which may observe less spurs coupled via the substrate of the integrated circuit due to the use of the PLL to clean up the first clock signal.Type: ApplicationFiled: March 13, 2009Publication date: April 8, 2010Applicant: QUALCOMM INCORPORATEDInventors: I-Hsiang Lin, Roger Brockenbrough
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Patent number: 7675384Abstract: High-frequency couplers and coupling techniques are described utilizing artificial composite right/left-handed transmission line (CRLH-TL). Three specific forms of couplers are described; (1) a coupled-line backward coupler is described with arbitrary tight/loose coupling and broad bandwidth; (2) a compact enhanced-bandwidth hybrid ring coupler is described with increased bandwidth and decreased size; and (3) a dual-band branch-line coupler that is not limited to a harmonic relation between the bands. These variations are preferably implemented in a microstrip fabrication process and may use lumped-element components. The couplers and coupling techniques are directed at increasing the utility while decreasing the size of high-frequency couplers, and are suitable for use with separate coupler or couplers integrated within integrated devices.Type: GrantFiled: May 16, 2008Date of Patent: March 9, 2010Assignee: The Regents of the University of CaliforniaInventors: Tatsuo Itoh, Christophe Caloz, I-Hsiang Lin, Hiroshi Okabe
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Patent number: 7667555Abstract: High-frequency couplers and coupling techniques are described utilizing artificial composite right/left-handed transmission line (CRLH-TL). Three specific forms of couplers are described; (1) a coupled-line backward coupler is described with arbitrary tight/loose coupling and broad bandwidth; (2) a compact enhanced-bandwidth hybrid ring coupler is described with increased bandwidth and decreased size; and (3) a dual-band branch-line coupler that is not limited to a harmonic relation between the bands. These variations are preferably implemented in a microstrip fabrication process and may use lumped-element components. The couplers and coupling techniques are directed at increasing the utility while decreasing the size of high-frequency couplers, and are suitable for use with separate coupler or couplers integrated within integrated devices.Type: GrantFiled: May 16, 2008Date of Patent: February 23, 2010Assignee: The Regents of the University of CaliforniaInventors: Tatsuo Itoh, Christophe Caloz, I-Hsiang Lin, Hiroshi Okabe
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Publication number: 20090079513Abstract: High-frequency couplers and coupling techniques are described utilizing artificial composite right/left-handed transmission line (CRLH-TL). Three specific forms of couplers are described; (1) a coupled-line backward coupler is described with arbitrary tight/loose coupling and broad bandwidth; (2) a compact enhanced-bandwidth hybrid ring coupler is described with increased bandwidth and decreased size; and (3) a dual-band branch-line coupler that is not limited to a harmonic relation between the bands. These variations are preferably implemented in a microstrip fabrication process and may use lumped-element components. The couplers and coupling techniques are directed at increasing the utility while decreasing the size of high-frequency couplers, and are suitable for use with separate coupler or couplers integrated within integrated devices.Type: ApplicationFiled: May 16, 2008Publication date: March 26, 2009Applicant: THE REGENTS OF THE UNIVERSITY OF CALIFORNIAInventors: Tatsuo Itoh, Christophe Caloz, I-Hsiang Lin, Hiroshi Okabe
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Patent number: 7508283Abstract: High-frequency couplers and coupling techniques are described utilizing artificial composite right/left-handed transmission line (CRLH-TL). Three specific forms of couplers are described; (1) a coupled-line backward coupler is described with arbitrary tight/loose coupling and broad bandwidth; (2) a compact enhanced-bandwidth hybrid ring coupler is described with increased bandwidth and decreased size; and (3) a dual-band branch-line coupler that is not limited to a harmonic relation between the bands. These variations are preferably implemented in a microstrip fabrication process and may use lumped-element components. The couplers and coupling techniques are directed at increasing the utility while decreasing the size of high-frequency couplers, and are suitable for use with separate coupler or couplers integrated within integrated devices.Type: GrantFiled: March 28, 2005Date of Patent: March 24, 2009Assignee: The Regents of the University of CaliforniaInventors: Tatsuo Itoh, Christophe Caloz, I-Hsiang Lin, Hiroshi Okabe
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Publication number: 20090002093Abstract: High-frequency couplers and coupling techniques are described utilizing artificial composite right/left-handed transmission line (CRLH-TL). Three specific forms of couplers are described; (1) a coupled-line backward coupler is described with arbitrary tight/loose coupling and broad bandwidth; (2) a compact enhanced-bandwidth hybrid ring coupler is described with increased bandwidth and decreased size; and (3) a dual-band branch-line coupler that is not limited to a harmonic relation between the bands. These variations are preferably implemented in a microstrip fabrication process and may use lumped-element components. The couplers and coupling techniques are directed at increasing the utility while decreasing the size of high-frequency couplers, and are suitable for use with separate coupler or couplers integrated within integrated devices.Type: ApplicationFiled: May 16, 2008Publication date: January 1, 2009Applicant: THE REGENTS OF THE UNIVERSITY OF CALIFORNIAInventors: Tatsuo Itoh, Christophe Caloz, I-Hsiang Lin, Hiroshi Okabe
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Publication number: 20050253667Abstract: High-frequency couplers and coupling techniques are described utilizing artificial composite right/left-handed transmission line (CRLH-TL). Three specific forms of couplers are described; (1) a coupled-line backward coupler is described with arbitrary tight/loose coupling and broad bandwidth; (2) a compact enhanced-bandwidth hybrid ring coupler is described with increased bandwidth and decreased size; and (3) a dual-band branch-line coupler that is not limited to a harmonic relation between the bands. These variations are preferably implemented in a microstrip fabrication process and may use lumped-element components. The couplers and coupling techniques are directed at increasing the utility while decreasing the size of high-frequency couplers, and are suitable for use with separate coupler or couplers integrated within integrated devices.Type: ApplicationFiled: March 28, 2005Publication date: November 17, 2005Inventors: Tatsuo Itoh, Christophe Caloz, I-Hsiang Lin, Hiroshi Okabe