Broadcom Corporation

Kyocera Avx Components (san Diego), Inc.

Nxp Usa, Inc.

Amin Shameli

Ahmadreza Rofougaran

Maryam Rofougaran

Aminghasem Safarian

Jesse Shih-Chieh Hsin

Syed Khursheed Enam

Franco De Flaviis

Michael Roe

Hamid Eslami

Jatan Shah

Rozi Rofougaran

Mansoorali Companywala

Ahmadreza Rafougaran

A system for communicating data over a transmission line is disclosed. In one example implementation, the system may include a transmitter configured to modulate a control signal onto an RF signal using amplitude-shift keying modulation to generate a transmit signal. The system may include a receiver and a transmission line coupling the transmitter to the receiver. The transmitter may be configured to transmit the transmit signal over the transmission line to the receiver, and the receiver may be configured to de-modulate the control signal and extract clock information associated with the transmitter. In some embodiments, the system may include a tuning circuit and a modal antenna, and the tuning circuit may be or include the receiver. The receiver may be configured to adjust a mode of the modal antenna based on the control signal transmitted by the transmitter.

Method and system for controlling a modal antenna

A voltage regulator can include an input device, a current mirror, one or more offset control circuits, an output device, and a positive feedback loop. The input device can be configured to receive a source voltage from a voltage source. The current mirror can be coupled to the input device and configured to provide load current regulation within the voltage regulator. The one or more offset control circuits can be configured to balance voltage levels within the voltage regulator. The output device can include at least a first transistor that is matched to a second transistor within the voltage regulator such that the matching is configured to provide supply regulation within the voltage regulator. The positive feedback loop can be formed at least in part by the current mirror, the first transistor and the second transistor.

Voltage regulator circuit for following a voltage source with offset control circuit

A near field RFID system includes an RFID reader and an RFID tag. The RFID reader includes a transmit path and a receive path, wherein the transmit path includes: an encoding section coupled to convert data into encoded data; a digital to analog conversion module coupled to convert the encoded data into an analog encoded signal; a power amplifier coupled to amplify the analog encoded signal; and a plurality of coils coupled to generate a plurality of electromagnetic fields from the analog encoded signal. The RFID tag that includes: a coil coupled to generate a current and a recovered signal from at least one of the plurality of electromagnetic fields; a power recovery circuit coupled to generate a voltage from the current; and a data processing section coupled to process the recovered signal, wherein the data processing section is powered via the voltage.

Near field RFID system with multiple reader coils

A multi-mode RFID tag includes a power generating and signal detection module, a baseband processing module, a transmit section, a configurable coupling circuit, and an antenna section. In near field mode, the configurable coupling circuit is operable to couple the transmit section to a coil or inductor in the configurable coupling circuit to transmit an outbound transmit signal using electromagnetic or inductive coupling to an RFID reader. In far field mode, the configurable coupling circuit is operable to couple the transmit section to the antenna section, and the multi-mode RFID tag then utilizes a back-scattering RF technology to transmit the outbound transmit signal to RFID readers.

Multi-mode RFID tag architecture

A dynamic radio frequency (RF) front end includes an antenna array, a power amplifier structure, and a low noise amplifier structure. The power amplifier structure generates a plurality of outbound RF signals from an outbound RF signal and provides the plurality of outbound RF signals to the antenna array. Each of the plurality of outbound RF signals has a different transmit phase rotation. The low noise amplifier structure receives a plurality of inbound RF signals from the antenna array and outputs one of the plurality of inbound RF signals based on a favorable phase relationship with respect to the outbound RF signal. Each of the plurality of inbound RF signals has a different receive phase rotation.

Dynamic RF front end

Aspects of a method and system for identifying a radio frequency identification (RFID) tag location using a switchable coil are presented. Aspects of the systems may include one or more processors that enable selection of an inductor coil from a plurality of inductor coils. The selection of the inductor coil may be based on a change in an electromagnetic field, with respect to an initial electromagnetic field, as detected by the selected inductor coil. The processors may enable transmission of a signal, having a transmitter frequency in the UHF frequency band, via the selected inductor coil.

Method and system for identifying radio frequency identification (RFID) tag location using a switchable coil

An RFID reader is operable to receive an inbound RF signal during transmission of an outbound RF signal. The inbound RF signal may be a modulated, backscattered signal from a tag that has substantially the same frequency as the outbound RF signal or at a different frequency from the outbound RF signal. The receiver section of the RFID reader is operable to down convert the inbound RF signal by using a transmitter signal generated by the transmitter section to generate at least one local oscillation signal. The receiver section then processes and digitizes the down converted inbound RF signal to produce an encoded inbound signal.

RFID reader with receiver clock derived from transmitter output

A near field communication front-end includes an up conversion module, a plurality of coils, and a down conversion module. The up conversion module is coupled to convert an outbound symbol stream into a plurality of outbound signals based on a frequency-space encoding scheme. The plurality of coils is coupled to electromagnetically transmit the plurality of outbound signals and to electromagnetically receive a plurality of inbound signals in accordance with the frequency-space encoding scheme. The down conversion module is coupled to convert the plurality of inbound signals into an inbound symbol stream in accordance with the frequency-space encoding scheme.

Near field communication front-end

A receiver architecture for canceling blocking signals in the receive path includes a low noise amplifier for receiving and amplifying an inbound RF signal to produce an amplified inbound signal, in which the inbound RF signal includes a modulated RF signal and a blocking signal, and a cancellation module for substantially canceling the blocking signal from the amplified inbound RF signal and substantially passing the modulated RF signal. The cancellation module cancels the blocking signal by generating an injection signal representative of the blocking signal, combining the blocking signal with the injection signal to produce an error signal, updating the injection signal based on the error signal and using the injection signal to cancel the blocking signal from the amplified inbound RF signal.

Growing community of inventors

Irvine, CA, United States of America

Amin Shameli