Patents by Inventor Chul Roh

Chul Roh 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: 20110148478
    Abstract: Provided is a frequency conversion mixer. The frequency conversion mixer includes a transconductance stage, a switching stage, a load stage, a current bleeding circuit, and a bias stage. The transconductance stage receives an RF signal, and outputs a current corresponding to a voltage of the RF signal. The switching stage switches the current which is outputted from the transconductance stage in response to a local oscillation signal, for frequency conversion the RF signal into an intermediate frequency (IF) signal. The load stage is connected between the switching stage and a supply voltage terminal. The current bleeding circuit is connected parallel with the switching stage, especially, embodying inverter structure with transconductance stage to get not only current bleeding effect but also current reuse effect, and one resonant inductor for reducing noise which is generated in parasitic capacitance at node between transconductance stage and switching stage.
    Type: Application
    Filed: June 18, 2010
    Publication date: June 23, 2011
    Applicants: Electronics and Telecommunications Research Institute, Industry-University Cooperation Foundation Hanyang Univ.
    Inventors: Yun-mo KANG, Tae-yeoul YUN, Hee-woo AN, Chang Sun KIM, Yea Chul ROH, Seong Hoon CHOI
  • Patent number: 7965798
    Abstract: A method. The method includes producing a first signal match indication based on at least one match indication indicative of a match between at least one signal received in at least one band and a reference signal. The method also includes producing a first signal multipath combined signal based upon the first signal match indication, and detecting a first peak in the first multipath combined signal.
    Type: Grant
    Filed: August 13, 2007
    Date of Patent: June 21, 2011
    Assignee: Texas Instruments Incorporated
    Inventors: June Chul Roh, Anuj Batra, Manoneet Singh, Jaiganesh Balakrishnan
  • Publication number: 20110134842
    Abstract: A system and method for providing wireless communications between a medical controller hub and an implant node are disclosed. The hub transmits signals to facilitate communication connections with the node. The signals include connection invitation polls with identification parameters. A node monitors the hub's transmissions for the connection invitation polls. When a poll is detected, the node compares the identification parameters to a list of preferred identification values. If the received identification parameter is on the preferred list, and the node and hub are not already connected, then the node responds to the connection invitation poll. If the received identification parameter is not on the preferred list, then the node continues to monitor hub transmissions for other connection invitation polls that include identification parameters that are on the preferred list.
    Type: Application
    Filed: December 9, 2010
    Publication date: June 9, 2011
    Applicant: TEXAS INSTRUMENTS INCORPORATED
    Inventors: Jin-Meng Ho, June Chul Roh
  • Publication number: 20110109585
    Abstract: Provided are a touch screen and a method for compensating sensing capacitance variations and offset variations thereof. The touch screen includes: a touch panel where a plurality of driving lines and a plurality of sensing lines intersect and are wired; a driving unit for activating the driving lines sequentially; an input unit for measuring a sensing capacitance formed in a sensing line corresponding to an activated driving line; a multiplexer for serializing and outputting the measured sensing capacitance; an analog-to-digital converter for sampling the sensing capacitance outputted from the multiplexer by reflecting an initial sensing capacitance as an offset and performing analog-to-digital conversion for the sampling result; and a host processor for determining a touch event in response to the analog-to-digital conversion result.
    Type: Application
    Filed: September 9, 2010
    Publication date: May 12, 2011
    Applicants: Electronics and Telecommunications Research Institute, Industry-University Cooperation Foundation Hanyang Univ.
    Inventors: Oh-Kyong KWON, Jang Hyun Park, Yea Chul Roh, Chang Sun Kim
  • Publication number: 20110109392
    Abstract: Provided is a Low Noise Amplifier (LNA). Embodiments of the present invention provide LNAs including: a common gate amplifier circuit configure to amplify a signal of an input node to which an Alternating Current (AC) component is provided and transfer the amplified signal to an amplifier node; and a negative-feedback amplifier circuit configured to amplify a signal of the amplifier node, transfer the amplified signal to an output node, wherein the negative-feedback amplifier circuit includes a feedback capacitor and a feedback inductor connected in series between the amplifier node and the output node to form a negative feedback. the LNA of the present invention forms a negative feedback exclusive of a feedback resistance, such that a broad frequency bandwidth is obtained and noise and heat are reduced.
    Type: Application
    Filed: October 19, 2010
    Publication date: May 12, 2011
    Applicants: Electronics and Telecommunications Research Institute, Industry-University Cooperation Foundation Hanyang University
    Inventors: Jang Hyun PARK, Chang Sun Kim, Yea Chul Roh, Tae-Yeoul Yun, Hyun-kyu Park, Ji-Young Lee
  • Publication number: 20110069707
    Abstract: A packet detection and coarse symbol timing recovery system for preamble signal modulated with rotated differential M-ary phase shift key (PSK) modulation includes a differential detection unit, to provide a symbol signal responsive to a received signal. A preamble sequence correlator performs a preamble sequence correlation on the symbol signal to produce a correlator signal. A metric calculation unit performs a metric calculation on the correlator signal to produce a metric. A packet detection unit determines that a packet is detected and produces a sample index. A coarse symbol timing unit finds a peak of the calculated metric signal outputs a sample index for the peak as coarse symbol timing information. The sample indexes are used in processing a physical layer convergence procedure (PLCP) header and physical layer service data unit (PSDU) block.
    Type: Application
    Filed: September 14, 2010
    Publication date: March 24, 2011
    Applicant: TEXAS INSTRUMENTS INCORPORATED
    Inventors: June Chul ROH, Anuj BATRA, Srinath HOSUR
  • Publication number: 20100260232
    Abstract: A method comprises generating, by logic, a random number. The method also comprises determining a next frequency in said sequence using the random number and one or more of a minimum separation, a channel number, and a number of channels. The method further comprises hopping to the next frequency.
    Type: Application
    Filed: April 13, 2010
    Publication date: October 14, 2010
    Applicant: TEXAS INSTRUMENTS INCORPORATED
    Inventors: June Chul Roh, Anuj Batra
  • Publication number: 20100261429
    Abstract: In at least some embodiments, a communication device includes a transceiver with a physical (PHY) layer. The PHY layer is configured for body area network (BAN) operations in a limited multipath environment using M-ary PSK, differential M-ary PSK or rotated differential M-ary PSK. Also, the PHY layer uses a constant symbol rate for BAN packet transmissions.
    Type: Application
    Filed: April 14, 2010
    Publication date: October 14, 2010
    Applicant: TEXAS INSTRUMENTS INCORPORATED
    Inventors: Anuj BATRA, Timothy M. SCHMIDL, Srinath HOSUR, June Chul ROH
  • Publication number: 20100260236
    Abstract: In at least some embodiments, a communication device includes a transceiver with a physical (PHY) layer. The PHY layer is configured for body area network (BAN) operations in a limited multipath environment based on a constant symbol rate for BAN packet transmissions and based on M-ary PSK, differential M-ary PSK or rotated differential M-ary PSK modulation. The PHY layer is configured to construct a physical-layer service data unit (PSDU) based on a concatenate block, an insert shortened bits block, a Bose, Ray-Chaudhuri, Hocquenghem (BCH) encoder, a remove shortened bits block, an add pad bits block, a spreader, a bit interleaver, a scrambler, and a symbol mapper.
    Type: Application
    Filed: April 14, 2010
    Publication date: October 14, 2010
    Applicant: TEXAS INSTRUMENTS INCORPORATED
    Inventors: Anuj BATRA, Timothy M. SCHMIDL, Srinath HOSUR, June Chul ROH
  • Publication number: 20100260162
    Abstract: In at least some embodiments, a communication device includes a transceiver with a physical (PHY) layer. The PHY layer is configured for body area network (BAN) operations in a limited multipath environment based on a constant symbol rate for BAN packet transmissions and based on M-ary PSK, differential M-ary PSK or rotated differential M-ary PSK modulation. The PHY layer is configured to transmit and receive data in a frequency band selected from the group consisting of: 402-405 MHz, 420-450 MHz, 863-870 MHz, 902-928 MHz, 950-956 MHz, 2360-2400 MHz, and 2400-2483.5 MHz.
    Type: Application
    Filed: April 14, 2010
    Publication date: October 14, 2010
    Applicant: TEXAS INSTRUMENTS INCORPORATED
    Inventors: Anuj BATRA, Timothy M. SCHMIDL, Srinath HOSUR, June Chul ROH
  • Publication number: 20100246639
    Abstract: A method consisting of determining, by a symbol mapper, whether a previous burst position is below a threshold, wherein the previous burst position defines a location within a previous symbol. A determination that the previous burst position is below the threshold causes generating, by the symbol mapper, a random number in a complete set, the random number defines a current burst position, the current burst position defines a location within a current symbol and sending or receiving a value in the current burst position. A determination that the previous burst position is above the threshold causes generating, by the symbol mapper, a random number in a reduced set, the random number defines a modified current burst position, the modified current burst position defines a location within the current symbol and sending or receiving a value in the modified current burst position.
    Type: Application
    Filed: March 25, 2010
    Publication date: September 30, 2010
    Applicant: TEXAS INSTRUMENTS INCORPORATED
    Inventors: June Chul ROH, Anuj BATRA
  • Publication number: 20100202494
    Abstract: A symbol modulation system applicable to a body area network is disclosed herein. The symbol modulation system includes a symbol mapper. The symbol mapper is configured to determine a time within a predetermined symbol transmission interval at which a transmission representative of the symbol will occur. The time is determined based on a value of a symbol and a value of a time-hopping sequence. The time is selected from a plurality of symbol value based time slots, and a plurality of time-hopping sequence sub-time-slots within each symbol value based time slot. The symbol mapper is configured to generate a single guard interval within the symbol transmission interval. The single guard interval is positioned to terminate the symbol transmission interval.
    Type: Application
    Filed: February 9, 2010
    Publication date: August 12, 2010
    Applicant: TEXAS INSTRUMENTS INCORPORATED
    Inventors: June Chul ROH, Anuj BATRA, Sudipto CHAKRABORTY, Srinath HOSUR
  • Publication number: 20100109950
    Abstract: Embodiments of the invention provide a tightly-coupled integration filter for inertial sensor-assisted GNSS (global navigation satellite system) receiver. The inertial measurement unit (IMU) contains inertial sensors such as accelerometer, magnetometer, and/or gyroscopes. Embodiments include blending filter based on extended Kalman filter (EKF), which optimally integrates the IMU navigation data with all other satellite measurements (tightly-coupled integration filter). The proposed blending filter includes two states for estimating/compensating the speed scale-factor and the heading bias in the INS measurement.
    Type: Application
    Filed: November 4, 2009
    Publication date: May 6, 2010
    Applicant: TEXAS INSTRUMENTS INCORPORATED
    Inventor: June Chul Roh
  • Publication number: 20100109945
    Abstract: Techniques for loosely coupling a Global Navigation Satellite System (“GNSS”) and an Inertial Navigation System (“INS”) integration are disclosed herein. A system includes a GNSS receiver, an INS, and an integration filter coupled to the GNSS receiver and the INS. The GNSS receiver is configured to provide GNSS navigation information comprising GNSS receiver position and/or velocity estimates. The INS is configured to provide INS navigation information based on an inertial sensor output. The integration filter is configured to provide blended position information comprising a blended position estimate and/or a blended velocity estimate by combining the GNSS navigation information and the INS navigation information, and to estimate and compensate at least one of a speed scale-factor and a heading bias of the INS navigation information.
    Type: Application
    Filed: November 4, 2009
    Publication date: May 6, 2010
    Applicant: TEXAS INSTRUMENTS INCORPORATED
    Inventor: June Chul ROH
  • Publication number: 20100103033
    Abstract: Techniques for loosely coupling a Global Navigation Satellite System (“GNSS”) and an Inertial Navigation System (“INS”) integration are disclosed herein. A system includes a GNSS receiver, an INS, and an integration filter coupled to the GNSS receiver and the INS. The GNSS receiver is configured to provide GNSS navigation information comprising GNSS receiver position and/or velocity estimates. The INS is configured to provide INS navigation information based on an inertial sensor output. The integration filter is configured to provide blended position information comprising a blended position estimate and/or a blended velocity estimate by combining the GNSS navigation information and the INS navigation information, and to estimate and compensate at least one of a speed bias and a heading bias of the INS navigation information.
    Type: Application
    Filed: October 23, 2009
    Publication date: April 29, 2010
    Applicant: TEXAS INSTRUMENTS INCORPORATED
    Inventor: June Chul ROH
  • Publication number: 20100097268
    Abstract: Embodiments of the invention provide a blending filter based on extended Kalman filter (EKF), which optimally integrates the IMU navigation data with all other satellite measurements (tightly-coupled integration filter). Two more states in the EKF for estimating/compensating the speed bias and the heading bias in the INS measurement are added. The integration filter has no feedback loop for INS calibration, and can estimate/compensate the navigation error in the INS measurement within the integration filter.
    Type: Application
    Filed: October 21, 2009
    Publication date: April 22, 2010
    Applicant: TEXAS INSTRUMENTS INCORPORATED
    Inventor: June Chul Roh
  • Publication number: 20100079334
    Abstract: Embodiments of the invention provide a blending filter based on extended Kalman filter (EKF), which optimally integrates the IMU navigation data with all other satellite measurements tightly-coupled integration filter. This blending filter can be easily implemented with minor modification to the position engine of stand-alone GNSS receiver. Provided is a low-complexity tightly-coupled integration filter for sensor-assisted global navigation satellite system (GNSS) receiver. The inertial measurement unit (IMU) contains inertial sensors such as accelerometer, magnetometer, and/or gyroscopes Embodiments also include method for pedestrian dead reckoning (PDR) data conversion for ease of GNSS/PDR integration. The PDR position data is converted to user velocity measured at the time instances where GNSS position/velocity estimates are available.
    Type: Application
    Filed: September 28, 2009
    Publication date: April 1, 2010
    Applicant: TEXAS INSTRUMENTS INCORPORATED
    Inventors: June Chul Roh, Eric W. Waters, Srinath Hosur, Goutam Dutta
  • Publication number: 20100073227
    Abstract: Embodiments of the invention provide a method of detecting movement to aid GNSS receivers. By detecting when the user is stationary, the Doppler frequency estimation can be corrected or the SNR can be boosted more both of which lead to improved performance. The embodiments allow a GNSS receiver to process signals in when the signal level would otherwise be too low—for example indoors. The embodiments can improve performance when one or more satellites are temporarily blocked but one or more satellites are still being tracked.
    Type: Application
    Filed: September 24, 2009
    Publication date: March 25, 2010
    Applicant: TEXAS INSTRUMENTS INCORPORATED
    Inventors: Deric W. Waters, June Chul Roh, Sandeep Rao
  • Publication number: 20100054115
    Abstract: A system and method for sidelobe suppression in OFDM communications systems is provided. A method for transmitting an information symbol having a plurality of information sub-carriers and a plurality of active interference cancellation (AIC) sub-carriers includes generating AIC sub-carrier data based on the information to be transmitted, populating the plurality of information sub-carriers with the information, populating the plurality of AIC sub-carriers with the AIC sub-carrier data, applying baseband processing to the information symbol, thereby producing a processed symbol, and transmitting the processed symbol.
    Type: Application
    Filed: August 26, 2009
    Publication date: March 4, 2010
    Inventors: June Chul Roh, Anuj Batra
  • Publication number: 20090028220
    Abstract: A method. The method includes producing a first signal match indication based on at least one match indication indicative of a match between at least one signal received in at least one band and a reference signal. The method also includes producing a first signal multipath combined signal based upon the first signal match indication, and detecting a first peak in the first multipath combined signal.
    Type: Application
    Filed: August 13, 2007
    Publication date: January 29, 2009
    Inventors: June Chul Roh, Anuj Batra, Manoneet Singh, Jaiganesh Balakrishnan