Nxp B.v.

Koninklijke Philips Corporation N.v.

U.S. Philips Corporation

Siegfried H Arnold

Wolfgang Eber

Bernhard Spiess

Klaus Ully

Peter Th&uuml;ringer

Robert Kofler

Peter Thüringer

Werner Janesch

Davide Maschera

Wilfried Petschenig

Christian Lackner

Thomas Eibel

Bardo Mueller

Josef Preishuberpflugl

Hubert Watzinger

A wireless transmitter is disclosed. The wireless transmitter includes a digital signal generator arranged to generate a digital signal for transmission, a digital-to-analog converter arranged to convert the digital signal for transmission into analog form and a non-ideal amplifier arranged to amplify the analog signal for transmission. At least one harmonic reduction signal generator is arranged to generate at least one digital harmonic reduction signal and a summing junction is arranged to add the digital signal for transmission with the at least one harmonic reduction signal to form a combined signal. The non-ideal amplifier amplifies the combined signal to form an analog output signal. A controller is coupled to the digital signal generator and the at least one harmonic reduction signal generator.

Wireless transmitter, a circuit, and method for driver harmonic reduction

In one embodiment, a circuit, having a single supply, is provided to transmit a wireless signal with low common mode electromagnetic interference (EMI) emission. The circuit can achieve common mode attenuations of 40 dB or greater as a result of the symmetric built circuit. Also included is a system that includes a transmission circuit and a receiver circuit, and a method of using such a system.

3-level bridge driver with single supply and low common mode EMI emission

The present invention relates to a digital receiver for FM signals, in particular to a new demodulator structure and demodulating method, by which according to a first aspect of the invention the usual complex de-rotation process is reduced to a simple addition/subtraction. According to a second aspect of the invention, the requirements for the sampling frequency necessary for processing the demodulator signals are reduced substantially.

Simplified de-rotation in digital FM demodulator architectures

In a data carrier () for contactless communication of storage data (SD) with a reader station (), a recovery device () is provided, with which, following an unexpected abort of the storing of storage data (SD) in a memory () by virtue of a lack of supply voltage, a valid storage state can be restored in memory (). For this purpose, any storage locations that are only weakly stored in memory () will be read, and the read-out storage data (SD) will be re-stored in the memory ().

Roll back method for a smart card

In a communication arrangement () provided for transmitting data (DA) to a transponder () which arrangement includes a data source () for delivering data (DA) and includes a carrier signal generator () for generating a carrier signal (CS) and includes modulation means () to which can be applied the data (DA) and the carrier signal (CS) and which modulation means are provided for modulating a carrier signal (CS) in accordance with the data (DA) and for delivering a modulated carrier signal (CSM) to transmitting means () having an input resistance (), the modulation means () have a changeable output resistance () which forms a resistance network together with the input resistance () of the transmitting means (), and resistance change means () for changing the output resistance () in accordance with the data (DA).

Communication arrangement comprising powerful integrated amplitude-modulation means

In order to prevent the retrieval of data via the measurement of the power consumption in a data carrier provided with a data processing device, it is proposed to connect a load circuit to the power supply of the data carrier so as to influence the power consumption of the data carrier at least during security-relevant operations of the data processing device.

Data carrier with obscured power consumption

A transmitting/receiving station is operable in a transmitting mode and a receiving mode. The transmitting/receiving station has a transmission coil circuit with a transmission coil and conductor having a given characteristic impedance, a first end, and a second end. The conductor has its second end connected to the transmission coil circuit and has its first end connected to transmitter means for generation of a request signal and to receiver for receiving an answer signal. Additional circuits are provided in order to guarantee that the first end of the conductor has a matched termination during the receiving mode.

Transmitting-receiving station having impedance-matched receiving means for transponder answer signals

In a transponder communication device (1) having a selector for the successive individual selection of transponders (2) the selector having interrogator (5) for generating at least one item of interrogation information (AFI) with which the transponders (2) can be interrogated to transmit answer information (AWI) in response to the interrogation information (AFI), and time-window generator (17) for generating a series of K successive time windows (ZF) and controller (20) for the time-window generator (17), which controller can activate the time-window generator (17) so as to generate the series F of K time windows (ZF) a number of times in succession, and evaluator (22) which cooperates with the time-window generator (17) and by which, depending on the occurrence of at least one item of answer information (AWI) transmitted to the transponder communication device (1) by a transponder (2) in response to interrogation information (AFI), a transponder (2) can be selected in at least one time window (ZF) in each series (F) of the series (F) of K time windows (ZF) generated a number of times in succession.

Transponder communication device for the contactless communication with

A transmission and receiving device for contact data transmission between the device and a transponder. The transmission and receiving device has an antenna resonant circuit, a synchronous demodulator, a measuring unit, a control unit, and a reference signal generator. In operation, the device and the transponder are inductively coupled to each other through the antenna resonance circuit of the device and an antenna resonance circuit in the transponder. In response to an interrogation by the device, the transponder sends a load modulated digital signal to the device. The synchronous demodulator detects digital response data contained in the load modulated digital signal. The measuring unit measures a phase shift between a reference signal generated by the reference signal generator and a resonance signal generated in the antenna resonance circuit in the device by the sent load modulated digital signal. The control unit controls the synchronous demodulator such that the synchronous demodulator changes its demodulation mode between amplitude demodulation and phase demodulation, in dependence of the measured phase shift.

Growing community of inventors

St. Ruprecht A.D. Raab, Austria

Siegfried H Arnold