Abstract: An electromagnetic transponder includes an antenna circuit capable of providing signals to a charge pump. The pump includes a first transistor connected to a first capacitor. The transponder also includes means for applying a voltage alternating between first and second values between the gate and the conduction terminal on the side of the first capacitor of the first transistor.

Abstract: An electromagnetic transponder includes an antenna circuit capable of providing signals to a charge pump. The pump includes a first transistor connected to a first capacitor. The transponder also includes means for applying a voltage alternating between first and second values between the gate and the conduction terminal on the side of the first capacitor of the first transistor.

Abstract: A method of conversion by at least one interface circuit connected between a first bus including at least one data wire and one clock wire, and at least one second single-wire bus, of a transmission between a master circuit connected to the first bus and at least one slave circuit connected to the second bus, wherein a speculative read command is sent to the slave circuit before interpreting the state of a bit for controlling a reading or a writing, originating from the master circuit.

Abstract: A method for transmitting data over a single-wire bus wherein a first communication channel is defined by pulses of different durations according to the state of the transmitted bit and depending on a reference duration, and a second communication channel is defined by the reference duration.

Abstract: A method for authenticating a transmission between a first and a second circuit transiting through at least one third circuit, wherein: data are transmitted from the first to the third circuit, and from the third to the second circuit; a first signature of the data is calculated by the first circuit; at least a second signature of the data is calculated by the third circuit; at least one first portion of the first signature is transmitted by the first circuit to the third one; and the second signature is transmitted by the third circuit to the second one, a portion of this signature being distorted in case of a failure of authentication of the first portion of the first signature by the third circuit.

Abstract: A method and a circuit for detecting a radio-frequency signal, including at least one first MOS transistor with a channel of a first type, having its gate coupled to an input terminal capable of receiving said signal; a circuit for biasing the first transistor, capable of biasing it to a level lower than its threshold voltage; and a circuit for determining the average value of the current in the first transistor.

Abstract: An oscillator is provided that includes an oscillating structure generating an output signal with a frequency that drifts as a function of a parameter of its environment, and a compensation circuit coupled to the oscillating structure. The oscillating structure has a ring structure that includes delay cells looped together, and the compensation circuit supplies a compensation signal to the oscillating structure. The compensation signal varies as a function of changes in the parameter in order to compensate for the drift in the frequency of the generated signal. This makes it possible to compensate for oscillator temperature drifts in the absence of a regulation loop.

Abstract: There is provided a detector for extracting binary data frequency-modulated on a carrier signal. An axes generator produces M pairs of logic signals, the logic signals of the same pair being in quadrature. The decoder includes M asynchronous logic zero-crossing detectors producing first pulses and second pulses. An up-counter/down-counter has first, second and third values, and when it has the second value, passing to the first value during a first pulse, and passing to the third value during a second pulse, and a binary decoder generates binary data whose state is not modified when the up-counter/down-counter passes from the first value to the second value or from the third value to the second value. No external time base is required and the decoder has a reduced bit error ratio.

Abstract: A method and a circuit for detecting a radio-frequency signal, including at least one first MOS transistor with a channel of a first type, having its gate coupled to an input terminal capable of receiving said signal; a circuit for biasing the first transistor, capable of biasing it to a level lower than its threshold voltage; and a circuit for determining the average value of the current in the first transistor.

Abstract: The invention proposes a negative gain transconductance amplifier circuit (1) for capacitive load that includes: an RC serial circuit connected between an input terminal (E) of the amplifier circuit and a intermediate terminal (A); an amplification level connected between the intermediate terminal and an output terminal (S) designed to be connected to a capacitive load, and which includes: a first negative gain transconductance amplifier (2) connected via open loop between the intermediate terminal and the output terminal; a second negative gain transconductance amplifier (3) with characteristics that are notably identical to those of the first amplifier, connected via closed loop; its input and output are connected to the intermediate terminal via a resistance (R1).

Abstract: There is provided a detector for extracting binary data frequency-modulated on a carrier signal. An axes generator produces M pairs of logic signals, the logic signals of the same pair being in quadrature. The decoder includes M asynchronous logic zero-crossing detectors producing first pulses and second pulses. An up-counter/down-counter has first, second and third values, and when it has the second value, passing to the first value during a first pulse, and passing to the third value during a second pulse, and a binary decoder generates binary data whose state is not modified when the up-counter/down-counter passes from the first value to the second value or from the third value to the second value. No external time base is required and the decoder has a reduced bit error ratio.

Abstract: The invention proposes a negative gain transconductance amplifier circuit (1) for capacitive load that includes: an RC serial circuit connected between an input terminal (E) of the amplifier circuit and a intermediate terminal (A); an amplification level connected between the intermediate terminal and an output terminal (S) designed to be connected to a capacitive load, and which includes: a first negative gain transconductance amplifier (2) connected via open loop between the intermediate terminal and the output terminal; a second negative gain transconductance amplifier (3) with characteristics that are notably identical to those of the first amplifier, connected via closed loop; its input and output are connected to the intermediate terminal via a resistance (R1).

Abstract: An oscillator is provided that includes an oscillating structure generating an output signal with a frequency that drifts as a function of a parameter of its environment, and a compensation circuit coupled to the oscillating structure. The oscillating structure has a ring structure that includes delay cells looped together, and the compensation circuit supplies a compensation signal to the oscillating structure. The compensation signal varies as a function of changes in the parameter in order to compensate for the drift in the frequency of the generated signal. This makes it possible to compensate for oscillator temperature drifts in the absence of a regulation loop.