Abstract: A near field communication (NFC) device capable of operating by being powered by the field includes an NFC module for generating an electromagnetic carrier signal and modulating the carrier signal according to data to be transmitted, and an antenna circuit coupled to and driven by said NFC module with the modulated carrier signal. An electromagnetic compatibility (EMC) filter of the NFC device is coupled to the NFC module via output terminals of said NFC module. A powered by the field circuit of the NFC device is adapted to harvest energy from an external field to power said NFC device. The power by the field circuit is coupled to said EMC filter via one or more impedance elements. The NFC device is adapted to be able to operate in one of a reader mode, a battery supplied card mode, and a powered by the field card mode.

Abstract: A near field communication (NFC) device capable of operating by being powered by the field includes an NFC module for generating an electromagnetic carrier signal and modulating the carrier signal, and an antenna circuit coupled to and driven by said NFC module with the modulated carrier signal. A differential power combiner circuit is coupled to said NFC module via output terminals of said NFC module. A powered by the field circuit of the NFC device is adapted to harvest energy from an external field to power said NFC device. The power by the field circuit has a first terminal coupled to an output of said differential power combiner circuit via a first impedance block and a second terminal coupled to an input of said antenna circuit via a second impedance block. The NFC device is adapted to be able to operate in a powered by the field card mode.

Abstract: There is described a contactless communication device. The device comprises (a) a receiver unit (110, 610) having an antenna input (RXn, Vmid, RXp) for connecting to an antenna, the receiver unit (110, 610) being adapted to couple with a transmitting device and to receive an RF signal transmitted by the transmitting device, the receiver unit (110, 610) being further adapted to determine a point of time relating to a position of data within the RF signal, (b) a comparator (120) 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 (110, 610) and a reference voltage (Vref), and (c) a voltage regulation circuit coupled to the comparator (120) and to the antenna input (RXn, Vmid, RXp) of the receiver unit (110, 610), 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).

Abstract: Embodiments of methods and systems for operating a communications device that communicates via inductive coupling are described. In an embodiment, a method for operating a communications device that communicates via inductive coupling involves obtaining transmission output power information related to the communications device and measuring a detuning condition based on the transmission output power information. Other embodiments are also described.

Abstract: Transients caused by load modulation can fee compensated far by adjusting pulse shapes. A radio frequency (RP) carrier signal can be modulated using load modulation. For the modulated RF carrier signal a particular pattern can be detected for a symbol period that precedes a second symbol that does not use load modulation. In response to the detecting, a pulse shape of the first symbol can be adjusted to mitigate the transients.

Abstract: Disclosed is an integrated circuit, system or architecture suitable for NFC functionality and including an NFC companion block connectible to a power source and capable to providing a non-continuous power boost to NFC signals, inter alia, thereby facilitating use of a broader range of antennas, multiple antennas, and thereby providing greater NFC functionality and versatility Further disclosed is a detachable antenna embedded in a potentially detachable shell which closely fits a mobile device and is adapted for use with the above mentioned integrated circuit, system or architecture.

Abstract: Transients caused by load modulation can fee compensated far by adjusting pulse shapes. A radio frequency (RP) carrier signal can be modulated using load modulation. For the modulated RF carrier signal a particular pattern can be detected for a symbol period that precedes a second symbol that does not use load modulation. In response to the detecting, a pulse shape of the first symbol can be adjusted to mitigate the transients.

Abstract: There is described an RF bidirectional communication device utilizing active load modulation, the device comprising (a) a resonance circuit including an antenna (326), and (b) a control unit (322) 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 (f0) when the device is in the transmission mode and a second resonance frequency (f0+?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.

Abstract: Active load modulation antennas for contactless systems typically require the presence of a battery power source in the transponder device. The transponder typically cannot be powered by the reader device alone and also transmit an active load modulation signal. Embodiments in accordance with the invention are disclosed that allow transponder devices to transmit an active load modulation signal when powered only by the reader in the contactless system.

Abstract: A Near Field Communication (NFC) device for contactless communication includes a transmitter being adapted to generate an electromagnetic carrier signal and to modulate the carrier signal according to transmitting data, an antenna having an inductor, which antenna is connected to and driven by the transmitter with the modulated carrier signal, and wherein connection points of the antenna are further connected to inputs of switches, the outputs of these switches being switchable between ground potential and inputs of a rectifier, the outputs of the rectifier being fed to power supply rails of the NFC device.

Abstract: A radio frequency communication device has data transmission means and data receiving means. The data transmission means comprise load modulating means being adapted to receive a radio frequency carrier signal emitted by another RF communication device and to modulate the RF carrier signal by means of load modulation in accordance with data to be sent. The data receiving means comprise a RF frequency carrier signal generator being adapted to emit a radio frequency carrier signal and load demodulating means being connected to an emission path of the radio frequency carrier signal and demodulating the radio frequency carrier signal when it has been load modulated by another RF communication device.

Abstract: There is described a contactless communication device. The device comprises (a) a receiver unit (110, 610) having an antenna input (RXn, Vmid, RXp) for connecting to an antenna, the receiver unit (110, 610) being adapted to couple with a transmitting device and to receive an RF signal transmitted by the transmitting device, the receiver unit (110, 610) being further adapted to determine a point of time relating to a position of data within the RF signal, (b) a comparator (120) 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 (110, 610) and a reference voltage (Vref), and (c) a voltage regulation circuit coupled to the comparator (120) and to the antenna input (RXn, Vmid, RXp) of the receiver unit (110, 610), 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).

Abstract: A transceiving circuit (1, 1?) for contactless communication comprises transmitter means (3) being adapted to generate an electromagnetic carrier signal and to modulate the carrier signal according to transmitting data, and an antenna (5) being connected to and driven by the transmitter means (3) with the modulated carrier signal. At least one impedance-matching capacitor (C1a) is arranged serially to the antenna (5).

Abstract: There is described an RF bidirectional communication device utilizing active load modulation, the device comprising (a) a resonance circuit including an antenna (326), and (b) a control unit (322) 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 (f0) when the device is in the transmission mode and a second resonance frequency (f0+?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.

Abstract: Disclosed is an integrated circuit, system or architecture suitable for NFC functionality and including an NFC companion block connectible to a power source and capable to providing a non-continuous power boost to NFC signals, inter alia, thereby facilitating use of a broader range of antennas, multiple antennas, and thereby providing greater NFC functionality and versatility Further disclosed is a detachable antenna embedded in a potentially detachable shell which closely fits a mobile device and is adapted for use with the above mentioned integrated circuit, system or architecture.

Abstract: A Near Field Communication (NFC) device for contactless communication includes a transmitter being adapted to generate an electromagnetic carrier signal and to modulate the carrier signal according to transmitting data, an antenna having an inductor, which antenna is connected to and driven by the transmitter with the modulated carrier signal, and wherein connection points of the antenna are further connected to inputs of switches, the outputs of these switches being switchable between ground potential and inputs of a rectifier, the outputs of the rectifier being fed to power supply rails of the NFC device.

Abstract: An NFC device for contactless communication comprises transmitter means being adapted to generate an electromagnetic carrier signal and to modulate the carrier signal according to transmitting data, and an antenna having an inductor, which antenna is connected to and driven by the transmitter means with the modulated carrier signal. AC coupling capacitors are coupled to the inductor of the antenna, wherein the AC coupling capacitors are further connected to inputs of switches. The outputs of these switches can be switched between ground potential and inputs of rectifier means. The outputs of the rectifying means are fed to power supply rails of the NFC device.

Abstract: In a near field communication partner device (1) intended for the contactless transmission of digital data to be transmitted having a transmission circuit (2), the transmission circuit (2) comprises a modulation circuit (17) for the amplitude modulation of a carrier signal (CS), which modulation circuit (17) comprises a circuit stage (20, 20?) for producing a plurality of different resistance values (RW1, RW1?) that act on a signal output (TX1, TX2), which resistance values (RW1, RW1?) can be transformed, by means of a signal processing circuit (3) arranged to transform resistance values that belongs to the communication partner device (1), into transformed resistance values (RW2, RW2?), which transformed resistance values (RW2, RW2?) are responsible for damping a transmission coil (7) of the communication partner device (1) when modulated low-level carrier signal sections are generated in a modulated carrier signal.

Abstract: A radio frequency communication device has data transmission means and data receiving means. The data transmission means comprise load modulating means being adapted to receive a radio frequency carrier signal emitted by another RF communication device and to modulate the RF carrier signal by means of load modulation in accordance with data to be sent. The data receiving means comprise a RF frequency carrier signal generator being adapted to emit a radio frequency carrier signal and load demodulating means being connected to an emission path of the radio frequency carrier signal and demodulating the radio frequency carrier signal when it has been load modulated by another RF communication device.

Abstract: A radio frequency communication device has data transmission means and data receiving means. The data transmission means comprise load modulating means being adapted to receive a radio frequency carrier signal emitted by another RF communication device and to modulate the RF carrier signal by means of load modulation in accordance with data to be sent. The data receiving means comprise a RF frequency carrier signal generator being adapted to emit a radio frequency carrier signal and load demodulating means being connected to an emission path of the radio frequency carrier signal and demodulating the radio frequency carrier signal when it has been load modulated by another RF communication device.