Abstract: A circuit is provided, the circuit including: a first power supply terminal connected to a first p-type metal oxide semiconductor transistor; a second power supply terminal connected to a second p-type metal oxide semiconductor transistor; an output node connected between the first p-type metal oxide semiconductor transistor and second p-type metal oxide semiconductor transistor; and a decision circuit connected to the first power supply terminal and the second power supply terminal, wherein the decision circuit is powered by the output node and wherein gate terminals of the first p-type metal oxide semiconductor transistor and second p-type metal oxide semiconductor transistor are complementarily and actively controlled by the decision circuit.

Abstract: In accordance with various embodiments, a smart card is described which has an antenna, which is configured to receive an electromagnetic signal, a rectifier, which is configured to rectify the received signal, and a capacitive or an inductive DC-to-DC voltage converter, which is configured to provide a supply voltage on the basis of the rectified signal.

Abstract: According to an embodiment, a chip card communication arrangement is provided comprising a matching network and a chip card communication circuit comprising at least one matching network terminal, a receiver coupled to the matching network via the at least one matching network terminal and an active transmitter coupled to the matching network via the at least one matching network terminal.

Abstract: In accordance with various embodiments, a smart card is described which has an antenna, which is configured to receive an electromagnetic signal, a rectifier, which is configured to rectify the received signal, and a capacitive or an inductive DC-to-DC voltage converter, which is configured to provide a supply voltage on the basis of the rectified signal.

Abstract: According to an embodiment, a chip card is provided comprising a signal source configured to generate a signal to be transmitted via radio, a p-channel field effect transistor and being coupled with its source terminal to an upper supply potential and with its drain terminal to a common node; an n-channel field effect transistor and being coupled with its drain terminal to the common node and with its source terminal to a lower supply potential; an operational amplifier having a positive input terminal, a negative input terminal and an output terminal, wherein the positive input terminal is coupled to the common node, the negative input terminal is coupled to the signal source and the output terminal is coupled to the gate terminal of the p-channel field effect transistor and to the gate terminal of the n-channel field effect transistor; and an antenna coupled to the common node.

Abstract: A transponder power supply for providing a supply current based on an antenna input signal. The transponder power supply comprises an emergency circuit comprising a charging circuit, an emergency capacitor, and an output stage. The charging circuit is configured to charge the emergency capacitor based on the antenna input signal to a maximum voltage which is higher than a voltage of the antenna input signal. The output stage is configured to provide a contribution to the supply current using a charge of the emergency capacitor.

Abstract: According to an embodiment, a chip card communication arrangement is provided comprising a matching network and a chip card communication circuit comprising at least one matching network terminal, a receiver coupled to the matching network via the at least one matching network terminal and an active transmitter coupled to the matching network via the at least one matching network terminal.

Abstract: According to an embodiment, a chip card is provided comprising a signal source configured to generate a signal to be transmitted via radio, a p-channel field effect transistor and being coupled with its source terminal to an upper supply potential and with its drain terminal to a common node; an n-channel field effect transistor and being coupled with its drain terminal to the common node and with its source terminal to a lower supply potential; an operational amplifier having a positive input terminal, a negative input terminal and an output terminal, wherein the positive input terminal is coupled to the common node, the negative input terminal is coupled to the signal source and the output terminal is coupled to the gate terminal of the p-channel field effect transistor and to the gate terminal of the n-channel field effect transistor; and an antenna coupled to the common node.

Abstract: A circuit is provided, the circuit including: a first power supply terminal connected to a first p-type metal oxide semiconductor transistor; a second power supply terminal connected to a second p-type metal oxide semiconductor transistor; an output node connected between the first p-type metal oxide semiconductor transistor and second p-type metal oxide semiconductor transistor; and a decision circuit connected to the first power supply terminal and the second power supply terminal, wherein the decision circuit is powered by the output node and wherein gate terminals of the first p-type metal oxide semiconductor transistor and second p-type metal oxide semiconductor transistor are complementarily and actively controlled by the decision circuit.

Abstract: A transponder power supply for providing a supply current based on an antenna input signal. The transponder power supply comprises an emergency circuit comprising a charging circuit, an emergency capacitor, and an output stage. The charging circuit is configured to charge the emergency capacitor based on the antenna input signal to a maximum voltage which is higher than a voltage of the antenna input signal. The output stage is configured to provide a contribution to the supply current using a charge of the emergency capacitor.

Abstract: A transponder power supply for providing a supply current based on an antenna input signal. The transponder power supply comprises an emergency circuit comprising a charging circuit, an emergency capacitor, and an output stage. The charging circuit is configured to charge the emergency capacitor based on the antenna input signal to a maximum voltage which is higher than a voltage of the antenna input signal. The output stage is configured to provide a contribution to the supply current using a charge of the emergency capacitor.

Abstract: An antenna interface of a contactless device including a current source configured to provide a current signal which is dependent on a radio frequency field; and a pause detector coupled to the current source and configured to detect a field pause from the current signal and output a field pause signal.

Abstract: The present invention shows a contactless chip card comprising a controllable demodulation unit for demodulating an amplitude-modulated carrier signal, a measuring unit for determining a degree of modulation of the modulated carrier signal, and a control unit for controlling the demodulation unit on the basis of the determined degree of modulation of the carrier signal.

Abstract: A transponder power supply for providing a supply current based on an antenna input signal. The transponder power supply comprises an emergency circuit comprising a charging circuit, an emergency capacitor, and an output stage. The charging circuit is configured to charge the emergency capacitor based on the antenna input signal to a maximum voltage which is higher than a voltage of the antenna input signal. The output stage is configured to provide a contribution to the supply current using a charge of the emergency capacitor.

Abstract: An adaptive demodulator for a contactless device, including a rectifier configured to rectify a voltage which is dependent on a signal received by the contactless device, and a voltage regulator coupled to the rectifier and configured to adjust the voltage to be within a voltage window.

Abstract: A contactless IC device including a detection circuit configured to detect a carrier wave that has been amplitude shift-keying (ASK) modulated with digital data and a shunt circuit configured to regulate the carrier wave to a predetermined voltage level.

Abstract: A circuit arrangement for wirelessly exchanging data with a reader device, including an antenna for converting electromagnetic radiation into an antenna voltage, an analogue circuit for demodulating an information signal based on the antenna voltage, and a digital circuit for processing of the information signal and for receiving power from the analogue circuit. The circuit arrangement also includes a decoupling circuit, which is interconnected between the analogue circuit and the digital circuit and provides a decoupling of both circuits.

Abstract: A circuit arrangement having a signal input configured to be supplied with a voltage signal; a first operational transconductance amplifier (OTA) having a voltage input that may be coupled to the signal input; at least one second OTA having a voltage input that may be coupled to the signal input; and at least one output capacitor which may be coupled to an output of the first OTA and to an output of the at least one second OTA, wherein an identical potential is set at the outputs of the first OTA and of the at least one second OTA.

Abstract: A power supply for a contactless device having a power supply circuit configured to provide an internal power supply voltage, an emergency capacitor circuit having an emergency capacitor, configured to provide a source current during an external field pause, and a power supply regulator configured to regulate the internal power supply voltage and the source current, wherein the emergency capacitor circuit is electrically coupled in parallel with the power supply circuit.

Abstract: An adaptive demodulator for a contactless device, including a rectifier configured to rectify a voltage which is dependent on a signal received by the contactless device, and a voltage regulator coupled to the rectifier and configured to adjust the voltage to be within a voltage window.