摘要:
A data carrier (1) which can be operated in a contact-bound mode and in a contactless mode and a circuit (1A) for such a data carrier (1) has supply voltage generating means (35) for deriving a supply voltage (VDD), for various circuit sections of the data carrier (1) and of the circuit (1A), from a received useful HF signal (HF), and, in addition, potential equalizing circuit (94) by which at least two contact terminals (17A, 19A) each connected to a respective transmission contact (17, 19) can be brought at the same potential (ground).
摘要:
A data carrier (1) which can be operated in a contact-bound mode and in a contactless mode and a circuit (1A) for such a data carrier (1) has a.c. detection means (69) for detecting the presence of a useful HF signal (HF) received via a transmission coil (31) and clock signal detection means (73) for detecting a clock signal (CLK1) received via a transmission contact (16), and has logic means (82) which cooperate with the a.c. detection means (69) and the clock signal detection means (73) and which enable the activation of the contact-bound mode (CONTACT) and the activation of the contactless mode (CONTACTLESS) to be initiated.
摘要:
In a data carrier (1) which includes receiving means (5) for receiving a modulated carrier signal (MTS) which contains a data signal (DS1) encoded in conformity with an encoding method (MA, PW, MI, RTZ, FSK, PSK), demodulation means (9) for demodulating the received modulated carrier signal (MTS) and for outputting the encoded data signal (DS1) contained therein, decoding means (10, 20) for decoding the encoded data signal (DS1) and for outputting data (D1, D2), and data processing means (11) for processing the data (D1, D2) output by the decoding means (10, 20), the decoding means (10, 20) are provided with at least a first decoding stage (12) and a second decoding stage (13), the first decoding stage (12) being arranged to decode a data signal (DS1) encoded in conformity with a first method (RTZ) whereas the second decoding stage (13) is arranged to decode a data signal (DS1) encoded in conformity with a second method (MI).
摘要:
A data carrier (1) which can be operated in a contact-bound mode and in a contactless mode and a circuit (1A) for such a data carrier (1) has supply voltage generating means (35), for deriving a supply voltage (VDD) for various circuit sections of the data carrier (1) and of the circuit (1A) from a received useful HF signal (HF), and additional switching means (91) by means of which the application of a potential (VDD), which appears as a result of the supply voltage generated by the supply voltage generating means (35), to at least one contact terminal (17A) can be inhibited.
摘要:
In a data carrier (1) which includes receiving means (5) for receiving a modulated carrier signal (MTS) which contains a data signal (DS1) encoded in conformity with an encoding method (MA, PW, MI, RTZ, FSK, PSK), demodulation means (9) for demodulating the received modulated carrier signal (MTS) and for outputting the encoded data signal (DS1) contained therein, decoding means (10, 20) for decoding the encoded data signal (DS1) and for outputting data (D1, D2), and data processing means (11) for processing the data (D1, D2) output by the decoding means (10, 20), the decoding means (10, 20) are provided with at least a first decoding stage (12) and a second decoding stage (13), the first decoding stage (12) being arranged to decode a data signal (DS1) encoded in conformity with a first method (RTZ) whereas the second decoding stage (13) is arranged to decode a data signal (DS1) encoded in conformity with a second method (MI).
摘要:
A transponder (1) for the contactless communication with a base station (2) comprises an antenna resonant circuit (10) for receiving a modulated HF signal (5), signal processing means (13) for processing the modulated HF signal and for supplying a data signal (DS) and a clock signal (CLK), and data processing means (23) arranged to receive the data signal (DS) and the clock signal (CLK) and to process the data signal (DS), the clock signal (CLK) defining the processing speed of the data processing means (23) and the data processing means (23) being arranged to receive reset information (RI) for terminating the processing of the data signal (DS), the transponder (1) further comprising a frequency detector (31) arranged to receive the clock signal (CLK) and adapted to compare the frequency of the clock signal (CLK) with at least one limit frequency (fG1) and to supply the reset information (RI) to the data processing means (23).
摘要:
A transponder has a memory, a data processor, a transmit memory and a transmission circuit. The memory stores data. In a transmit mode of the transponder, the data processor is operable in a normal-energy mode and an energy-saving mode. When the data processor is in the normal-energy mode, the data processor retrieves the data from the memory and processes the data, and the processed data is stored in the transmit memory. Thereafter, the data processor is controlled from the normal-energy mode to the energy-saving mode, and the transmission circuit reads out the stored processed data from said transmit memory and transmits the read out stored processed data to a base station. Transponder for transmitting processed data to a base station over large distances and at a high data transfer rate.
摘要:
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.
摘要:
In a data carrier (1), or a circuit (3) for such a data carrier (1), in which data processing means (20) are included which can be supplied with a supply voltage (V) and in which, during the processing of data while utilizing a characteristic value, a current peak pattern which is significant of the characteristic value occurs on its supply voltage drain terminals (27, 29, 31, 33 and 28, 30, 32 and 34), current peak pattern suppression means are associated with the data processing means (20;) these suppression means are preferably formed by filter means (36) which include a capacitor (37) which is arranged in the direct vicinity of the data processing means (20) and is connected to the data processing means (20) via low-ohmic connection segments (40, 41, 42, 43, 44, 45, 46, 47).
摘要:
A device for processing and storing data, in particular a chip card, includes a first interface with contacts and a second contactless interface for receiving energy or power from and for communication with a terminal device. A first controllable switching device connects either the first or the second interface to a non-volatile semiconductor memory through address, data and control lines. A logic circuit drives the first controllable switching device. A second controllable switching device disposed between the first controllable switching device and the memory can be driven at least by the logic circuit and an address signal present on the address lines.