Nxp B.v.

Renesas Design Austria Gmbh

Panthronics Ag

Universitat Innsbruck

Michael Pieber

Stefan Mendel

Erich Merlin

Jakob Jongsma

Klemens Breitfuss

Helmut Kranabenter

Francesco Antonetti

Tomaz Felicijan

Stefan Heibl

Jan Crols

Andreas Schröck

Hamzeh Nassar

Tobias Schlager

Johannes Gerstmayr

Alessandro Goitre

A transmitter configured to transmit a modulated transmitter data signal in an RF-Field over the air and configured to receive a modulated receiver data signal, which transmitter comprises a transmitter stage configured to generate the modulated transmitter data signal with a particular frequency and waveform based on a carrier signal and an antenna connected to the transmitter stage via a matching circuit of the transmitter and configured to transmit the modulated transmitter data signal in the RF-Field over the air a receiver stage connected via the matching circuit to the antenna and configured to receive the modulated receiver data signal, wherein the transmitter includes a measurement stage to measure an actual resonance frequency (f) of the antenna and its matching circuit connected to the transmitter stage and to the receiver stage.

Transmitter with a frequency measurement stage

A transmitter () to transmit an amplitude modulated data signal () in an RF-Field () over the air to a receiver () of an RFID communication system () which transmitter () comprises: a wave generator () to generate a carrier signal () with a particular frequency and waveform; a modulation stage () to modulate the carrier signal () in relation to a data signal to be transmitted; an antenna () connected to the modulation stage () or wave generator () via an amplifier () and a matching circuit () to transmit the amplitude modulated data signal () in the RF-Field () over the air, characterized in that the transmitter () furthermore comprises: a shape stage () connected to the wave generator () to select the waveform of the carrier signal () depending directly or indirectly on the data signal.

Wave-shaping for over- and undershoot prevention

A device () that processes a Near Field Communication type application which device () comprises: a host controller circuit () that processes device applications, that use the Near Field Communication type application, and that processes a host driver () that communicates based on a first interface protocol (NCI; EMV); a NFC controller circuit () that processes a Near Field Communication type contactless interface () and a controller driver () that interfaces with the host controller circuit (), wherein the host controller circuit () processes a first transmission module () that interfaces with the host driver () based on the first interface protocol (NCI; EMV) and with the controller driver () based on a second interface protocol, which first transmission module () furthermore processes substantially all none-time critical and/or memory consuming tasks of the Near Field Communication type application and wherein the NFC controller circuit () comprises a second transmission module () that processes all time critical tasks for the Near Field Communication type application towards the Near Field Communication type contactless interface ().

NFC 'split stack' architecture

Embodiments of a method and a system controlling an amplifier of a communications device are disclosed. In an embodiment, a method for controlling an amplifier of a communications device involves checking for a data reception at the communications device and freezing a gain of the amplifier if the data reception is detected.

Method and system for controlling an amplifier of a communications device

There is described a contactless communication device. The device comprises (a) a receiver unit () having an antenna input (RXn, Vmid, RXp) for connecting to an antenna, the receiver unit () being adapted to couple with a transmitting device and to receive an RF signal transmitted by the transmitting device, the receiver unit () being further adapted to determine a point of time relating to a position of data within the RF signal, (b) a comparator () adapted to generate a comparator output signal (agc_comp) which is indicative of a relation between a voltage at the antenna input (RXn, Vmid, RXp) of the receiver unit () and a reference voltage (Vref), and (c) a voltage regulation circuit coupled to the comparator () and to the antenna input (RXn, Vmid, RXp) of the receiver unit (), the voltage regulation circuit being adapted to repetitively regulate the voltage at the antenna input (RXn, Vmid, RXp) based on the comparator output signal (agc_comp). The voltage regulation circuit is adapted to separate each repetitive regulation of the voltage at the antenna input (RXn, Vmid, RXp) by a first time constant prior to the point of time determined by the receiver unit () and by a second time constant after the point of time determined by the receiver unit (), wherein the first time constant is smaller than the second time constant. There is also described a method, a computer program and a computer program product.

Contactless communication device with receiver input voltage stabilization

Embodiments of a method and a system for processing a radio frequency (RF) signal are disclosed. In an embodiment, a method for processing an RF signal involves down-converting the RF signal into a converted signal, obtaining a received signal strength indicator (RSSI) value based on an amplitude of the RF signal, and amplifying the converted signal based on the RSSI value.

Method and system for processing a radio frequency (RF) signal

There is described an RF bidirectional communication device utilizing active load modulation, the device comprising (a) a resonance circuit including an antenna (), and (b) a control unit () for controlling communication of the device, including switching between a transmission mode and a receiving mode, wherein the control unit is adapted to (c) modify a configuration of the resonance circuit such that the resonance circuit has a first resonance frequency (f) when the device is in the transmission mode and a second resonance frequency (f+&#x394;f) when the device is in the receiving mode, and (d) modify the configuration of the resonance circuit such that a Q-factor of the resonance circuit is periodically decreased while the device is in the transmission mode. There is also described a corresponding method and a system comprising a RF device and a reader/writer device. Furthermore, there is described a computer program and a computer program product.

RF device and method with improved active load modulation capability

A device () for measuring a frequency of an input signal (IN) that is expected to comprise a carrier signal (CS) either being unmodulated (CSU) or being modulated (CSM) according to a predefined signal coding and relates to a Radio Frequency Identification (RFID) transponder.

Growing community of inventors

Kumberg, Austria

Michael Pieber