Patents by Inventor Edwin De Angel

Edwin De Angel 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: 20190097598
    Abstract: A power detector for use in an RF receiver. The detector includes a power reference generator and a power quantizer. The power reference generator develops a power reference current, voltage, or signal as a function of a power transferred via a received RF signal. The power quantizer is responsive to the power reference current, voltage, or signal to develop a digital field power value indicative of the power reference current, voltage, or signal.
    Type: Application
    Filed: November 21, 2018
    Publication date: March 28, 2019
    Applicant: RFMicron, Inc.
    Inventors: Shahriar Rokhsaz, Edwin De Angel
  • Patent number: 10079825
    Abstract: In an RFID system, a method and apparatus for linking an RFID tag to an associated object. The system includes a relatively simple tag, a reader, a linker, and a store. The reader interrogates the tag for an ID and selectively provides the ID to the linker. The linker, in turn, uses the ID to provide back to the reader an associated Uniform Resource Identifier (“URI”). The reader then forwards the URI to the store. In response, the store returns to the reader the object associated with the ID via the URI. The disclosed method and apparatus provide more efficient and secure tag authentication.
    Type: Grant
    Filed: July 28, 2010
    Date of Patent: September 18, 2018
    Assignee: RFMICRON, INC.
    Inventors: Shahriar Rokhsaz, Edwin de Angel
  • Publication number: 20180076789
    Abstract: A power detector for use in an RF receiver. The detector includes a power reference generator and a power quantizer. The power reference generator develops a power reference current, voltage, or signal as a function of a power transferred via a received RF signal. The power quantizer is responsive to the power reference current, voltage, or signal to develop a digital field power value indicative of the power reference current, voltage, or signal.
    Type: Application
    Filed: November 20, 2017
    Publication date: March 15, 2018
    Applicant: RFMicron, Inc.
    Inventors: Shahriar Rokhsaz, Edwin De Angel
  • Patent number: 9830548
    Abstract: A radio frequency (RF) circuit comprises an antenna operably coupled to receive an RF signal, a power harvesting circuit operable to generate a first power source from the RF signal, a tank circuit coupled to the antenna and a tuning circuit. The tank circuit includes a selectively variable impedance and the tuning circuit is adapted to dynamically vary the selectively variable impedance of the tank circuit based on resonance of the RF circuit and frequency of the RF signal to substantially align the resonance of the RF circuit with the frequency of the RF signal. When the resonance of the RF circuit is substantially aligned with the frequency of the RF signal, the power harvesting circuit generates a second power source from the RF signal such that the second power source is greater than the first power source.
    Type: Grant
    Filed: July 7, 2017
    Date of Patent: November 28, 2017
    Assignee: RFMicron, Inc.
    Inventors: Shahriar Rokhsaz, Edwin de Angel
  • Patent number: 9825608
    Abstract: A method and apparatus for detecting RF field strength. A field strength reference generator develops a field strength reference current as a function of a field strength of a received RF signal; and a field strength quantizer develops a digital field-strength value indicative of the field strength reference current. In one embodiment, detected field strength is used to dynamically vary the impedance of a tank circuit whereby, over time, induced current is maximized.
    Type: Grant
    Filed: January 8, 2014
    Date of Patent: November 21, 2017
    Assignee: RFMICRON, INC.
    Inventors: Shahriar Rokhsaz, Edwin de Angel
  • Publication number: 20170308783
    Abstract: A radio frequency (RF) circuit comprises an antenna operably coupled to receive an RF signal, a power harvesting circuit operable to generate a first power source from the RF signal, a tank circuit coupled to the antenna and a tuning circuit. The tank circuit includes a selectively variable impedance and the tuning circuit is adapted to dynamically vary the selectively variable impedance of the tank circuit based on resonance of the RF circuit and frequency of the RF signal to substantially align the resonance of the RF circuit with the frequency of the RF signal. When the resonance of the RF circuit is substantially aligned with the frequency of the RF signal, the power harvesting circuit generates a second power source from the RF signal such that the second power source is greater than the first power source.
    Type: Application
    Filed: July 7, 2017
    Publication date: October 26, 2017
    Applicant: RFMicron, Inc.
    Inventors: Shahriar Rokhsaz, Edwin de Angel
  • Publication number: 20170302247
    Abstract: A method and apparatus for detecting RF field strength. A field strength reference generator develops a field strength reference current as a function of a field strength of a received RF signal; and a field strength quantizer develops a digital field-strength value indicative of the field strength reference current. In one embodiment, detected field strength is used to dynamically vary the impedance of a tank circuit whereby, over time, induced current is maximized.
    Type: Application
    Filed: January 8, 2014
    Publication date: October 19, 2017
    Applicant: RFMICRON, INC.
    Inventors: Shahriar Rokhsaz, Edwin de Angel
  • Patent number: 9704085
    Abstract: A method and apparatus for detecting RF field strength. A field strength reference generator develops a field strength reference current as a function of a field strength of a received RF signal; and a field strength quantizer develops a digital field-strength value indicative of the field strength reference current. In one embodiment, detected field strength is used to dynamically vary the impedance of a tank circuit whereby, over time, induced current is maximized. In another embodiment, using the quantized field strength to sense changes to the environment to which the RFID tag is exposed.
    Type: Grant
    Filed: March 11, 2015
    Date of Patent: July 11, 2017
    Assignee: RFMicron, Inc.
    Inventors: Shahriar Rokhsaz, Edwin de Angel
  • Publication number: 20170083805
    Abstract: A method and apparatus for detecting RF field strength. A field strength reference generator develops a field strength reference current as a function of a field strength of a received RF signal; and a field strength quantizer develops a digital field-strength value indicative of the field strength reference current. In one embodiment, detected field strength is used to dynamically vary the impedance of a tank circuit whereby, over time, induced current is maximized. In another embodiment, using the quantized field strength to sense changes to the environment to which the RFID tag is exposed.
    Type: Application
    Filed: March 11, 2015
    Publication date: March 23, 2017
    Applicant: RFMicron, Inc.
    Inventors: Shahriar Rokhsaz, Edwin de Angel
  • Patent number: 9048819
    Abstract: A method and apparatus for detecting RF field strength. A field strength reference generator develops a field strength reference current as a function of a field strength of a received RF signal; and a field strength quantizer develops a digital field-strength value indicative of the field strength reference current. In one embodiment, detected field strength is used to dynamically vary the impedance of a tank circuit whereby, over time, induced current is maximized. In another embodiment, using the quantized field strength to sense changes to the environment to which the RFID tag is exposed.
    Type: Grant
    Filed: August 14, 2011
    Date of Patent: June 2, 2015
    Assignee: RF Micron, Inc.
    Inventors: Shahriar Rokhsaz, Edwin de Angel
  • Patent number: 8749319
    Abstract: A method and apparatus for detecting RF field strength. A field strength reference generator develops a field strength reference current as a function of a field strength of a received RF signal; and a field strength quantizer develops a digital field-strength value indicative of the field strength reference current. In one embodiment, detected field strength is used to dynamically vary the impedance of a tank circuit whereby, over time, induced current is maximized.
    Type: Grant
    Filed: August 14, 2011
    Date of Patent: June 10, 2014
    Assignee: RFMicron, Inc.
    Inventors: Shahriar Rokhsaz, Edwin de Angel
  • Publication number: 20140120836
    Abstract: A method and apparatus for detecting RF field strength. A field strength reference generator develops a field strength reference current as a function of a field strength of a received RF signal; and a field strength quantizer develops a digital field-strength value indicative of the field strength reference current. In one embodiment, detected field strength is used to dynamically vary the impedance of a tank circuit whereby, over time, induced current is maximized.
    Type: Application
    Filed: January 8, 2014
    Publication date: May 1, 2014
    Applicant: RFMICRON, INC.
    Inventors: Shahriar Rokhsaz, Edwin de Angel
  • Patent number: 8165835
    Abstract: A power measurement and calibration system provides power and line frequency measurements by using a bandpass filter having complex voltage and current outputs from which real and imaginary power components can be determined. Calibration of the filter may be omitted if a complex wavelet filter is used to implement the bandpass filter and a determination of line frequency can also be provided for downstream use. A processor receiving data from the output of the filter can compute real and imaginary power, power factor and the line frequency. The filter may be implemented by a processor executing program instructions, or a digital circuit implementing the filter and optionally a CORDIC rotator for computing the current-to-voltage phase relationship can provide input to the processor for power measurement and calibration of the sample rate to line frequency relationship and for other uses.
    Type: Grant
    Filed: October 27, 2008
    Date of Patent: April 24, 2012
    Assignee: Cirrus Logic, Inc.
    Inventors: Rahul Singh, Dale Brummel, Hang Liu, Robert Leon Gorsegner, Edwin De Angel, Jean Charles Pina
  • Publication number: 20110300808
    Abstract: A method and apparatus for detecting RF field strength. A field strength reference generator develops a field strength reference current as a function of a field strength of a received RF signal; and a field strength quantizer develops a digital field-strength value indicative of the field strength reference current. In one embodiment, detected field strength is used to dynamically vary the impedance of a tank circuit whereby, over time, induced current is maximized.
    Type: Application
    Filed: August 14, 2011
    Publication date: December 8, 2011
    Applicant: RFMICRON, INC.
    Inventors: Shahriar Rokhsaz, Edwin de Angel
  • Publication number: 20110291810
    Abstract: A method and apparatus for detecting RF field strength. A field strength reference generator develops a field strength reference current as a function of a field strength of a received RF signal; and a field strength quantizer develops a digital field-strength value indicative of the field strength reference current. In one embodiment, detected field strength is used to dynamically vary the impedance of a tank circuit whereby, over time, induced current is maximized. In another embodiment, using the quantized field strength to sense changes to the environment to which the RFID tag is exposed.
    Type: Application
    Filed: August 14, 2011
    Publication date: December 1, 2011
    Applicant: RFMicron, Inc.
    Inventors: Shahriar Rokhsaz, Edwin de Angel
  • Publication number: 20110025458
    Abstract: In an RFID system, a method and apparatus for linking an RFID tag to an associated object. The system includes a relatively simple tag, a reader, a linker, and a store. The reader interrogates the tag for an ID and selectively provides the ID to the linker. The linker, in turn, uses the ID to provide back to the reader an associated Uniform Resource Identifier (“URI”). The reader then forwards the URI to the store. In response, the store returns to the reader the object associated with the ID via the URI. The disclosed method and apparatus provide more efficient and secure tag authentication.
    Type: Application
    Filed: July 28, 2010
    Publication date: February 3, 2011
    Applicant: RFMICRON, INC.
    Inventors: Shahriar Rokhsaz, Edwin de Angel
  • Patent number: 7657722
    Abstract: A method and apparatus for automatically securing non-volatile (NV) storage in an integrated circuit provides improved resistance to code copying and reverse-engineering attacks. External interfaces that provide read access to the NV storage are be disabled, for a predetermined time after a reset or other initialization signal is received. An internal lock state bit or key is checked as well as an external lock prevent indication. If the lock prevent indication is not received, or the internal lock state bit is already set, then the integrated circuit is operated under a locked condition, in which external access to the NV storage values is prevented. The lock prevent indication may be a signal provided during reset of the integrated circuit on a terminal that is used for another purpose after initialization of the integrated circuit.
    Type: Grant
    Filed: June 30, 2007
    Date of Patent: February 2, 2010
    Assignee: Cirrus Logic, Inc.
    Inventors: Edwin De Angel, Jorge Antonio Abullarade, Jean Charles Pina, Rahul Singh
  • Patent number: 7515076
    Abstract: A method and apparatus for reducing switching noise in a system-on-chip (SoC) integrated circuit including an analog to digital converter (ADC) provides for reduced noise in the ADC conversions. Sampling circuits of the ADC are operated by sampling clock signals and digital circuits and other noise-generating circuits such as power converters, are operated by digital circuit clock signals. Both sets of clock signals are derived from the same master clock by a clock generator circuit, but an offset is applied in the clock generator circuit to move the edges of the digital circuit clock signals away from critical sampling intervals corresponding to edges of the sampling clocks. In one embodiment, the offset is applied by a processor core that forms part of the digital circuits by setting a value in the clock generator, which the clock generator then loads into the divider after halting the clock to the digital circuits.
    Type: Grant
    Filed: September 28, 2007
    Date of Patent: April 7, 2009
    Assignee: Cirrus Logic, Inc.
    Inventors: Rahul Singh, Prashanth Drakshapalli, Jie Fang, Edwin De Angel, Mohit Sood
  • Patent number: 7218612
    Abstract: A network arrangement uses a poll select control protocol and a loop back arrangement at each node for equalizing transmission delay from each node to a central station. Delays at each node can be adjusted to start timing in response to a broadcast signal indicating an amount of delay to be applied from the start of a synchronization interval to the beginning of transmission of data collected at the nodes. The arrangement is particularly useful in the field of data acquisition and particularly in the area of seismic sensing.
    Type: Grant
    Filed: June 9, 2003
    Date of Patent: May 15, 2007
    Assignee: Cirrus Logic, Inc.
    Inventors: Joel Page, Edwin De Angel, Wai Laing Lee, Lei Wang, Hong Helena Zheng, Chung-Kai Chow
  • Patent number: 6980037
    Abstract: A power on reset circuit, preferably for an integrated circuit, detects application of voltage, starts a phase locked loop one application of voltage is detected but inhibits all clock used for digital logic operations until voltage stability is achieved. If a switched converter is used, the duty cycle of the switched converter is held at unity for a period of time before it is set to that needed to achieve the desired chip operating voltage. Clocks controlling other circuits can be released in stages after the duty cycle of the switched converter is set to its operating voltage level.
    Type: Grant
    Filed: September 16, 1998
    Date of Patent: December 27, 2005
    Assignee: Cirrus Logic, Inc.
    Inventors: Joel Page, Edwin De Angel, Wai Laing Lee, Lei Wang, Hong Helena Zheng, Chung-Kai Chow