Nxp B.v.

Robert Spindler

Roland Brandl

Ewald Bergler

Christian Scherabon

Robert Entner

A sub-stage for a charge pump includes a dc input pin, a dc output pin, a first radio frequency (rf) input pin configured to receive a first differential signal, a second rf input pin configured to receive a second differential signal, a first transistor having first, second and third terminals, a second transistor having first, second and third terminals, a first bias voltage source, and a second bias voltage source. The third terminal of the first transistor is configured to receive the second differential signal from the second rf input pin and a first offset voltage signal from the first bias voltage source. The third terminal of the second transistor is configured to receive the second differential signal from the second rf input pin and a second offset voltage signal from the second bias voltage source.

Sub-stage for a charge pump

A circuit () comprises a first circuit point () and a second circuit point (), which first circuit point () and second circuit point () are designed to be connected with RF transmission means () being designed for receiving in a contact-less manner a carrier signal (CS) from a read/write station and for feeding the circuit () with the received carrier signal (CS). The circuit () further comprises circuit testing means () being designed to carry out functional tests of the circuit () and to output a modulated response signal (TS-MOD) via the first and second circuit points () only if the functional tests have been successful. The circuit () further comprises test trigger signal detecting means () being designed for detecting a test trigger signal (TS) that is applied across the first circuit point () and the second circuit point (), wherein the test trigger signal detecting means () are designed to trigger the circuit testing means () to carry out the functional tests if they detect the test trigger signal (TS).

Circuit and data carrier with radio frequency interface

An RFID system comprises at least one reading device () and at least one transponder (), which are configured for non-contact communication by means of modulated electromagnetic signals (SS), which contain data and/or commands packed in data frames, in which the reading device () is configured for transmitting a group of data frames (D-SYNC), which contain synchronization information (Preamble, Start Delimiter) for synchronization with the transponder () and to transmit another group of data frames (D-NOSYNC) which do not contain such synchronization information, in which the transponder () has synchronization means () which are configured to effect synchronization with the reading device () with the help of synchronization information (Preamble, Start Delimiter) contained in received data frames (D-SYNC) and synchronization status test means () configured for detecting whether the transponder runs synchronously with the reading device and in the event of it not running synchronously, to switch on the synchronization unit ().

Sychronization during anti-collision

An electric circuit () for generating a clock-sampling signal (CLK) for a sampling device () comprises a clock generator () for generating a plurality of clock signals (---), a correlation device (L) for correlating a characteristic signal section (LE) of a digital signal (DS) with the plurality of clock signals (--), and a selecting device (MX) for selecting one of the clock signals (--) as the clock-sampling signal (CLK) for the sampling device () on the basis of the correlation by the correlation device (L). The clock signals (---) have the same cycle duration (T) and are phase-shifted with respect to each other. The sampling device () subsequently samples the digital signal (DS) with the clock-sampling signal (CLK).

Electric circuit for and method of generating a clock signal

A radio frequency interface circuit () for a radio frequency identification tag comprising&#x2014;at least two input terminals (RF+, RF&#x2212;) for connecting the circuit () with an antenna structure of the radio frequency identification tag, &#x2014;one or more variable resistive loads () coupled across pairs of the input terminals (RF+, RF&#x2212;)&#x2014;one or more rectifiers () each connected on its input side to a pair of input terminals (RF+, RF&#x2212;) and on its output side to a parallel connection of voltage control means () and modulation control means (), wherein combiner means () are provided which are adapted to receive an output signal () from the voltage control means () and the modulation control means (), respectively, and to generate a control signal () for controlling each variable resistive load () depending on the received signals () in such a way that each variable resistive load () serves as a modulation and voltage regulation circuit, and wherein each variable resistive load is adapted to serve as an electro static discharge protection circuit.

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Graz, Austria

Robert Spindler