Abstract: An electronic device including an electronic circuit (1, 8) for delivering an output signal (CKS) and a programmable non volatile memory (30) coupled to the electronic circuit to allow storage of a binary word (EED[7:0]) representative of at least one adjustable feature (C1, C2) of the electronic circuit (1, 8), this electronic device including at least first and second supply terminals (PAD_VDD, PAD_VSS), to which first and second supply voltages are applied (VDD, VSS) and at least one output terminal (PAD_OUT) at which the output signal from the electronic circuit is delivered. Circuits are provided for switching the output terminal into a so-called high impedance state so as to allow the introduction, in serial form, via this output terminal, of data bits intended, in particular, to be stored in the non volatile memory of the device. This device is applied, in particular, for adjusting the features of an oscillator circuit.

Abstract: There is described an electronic device including an electronic circuit (1, 8) for delivering an output signal (CKS) and a programmable non volatile memory (30) coupled to the electronic circuit to allow storage of a binary word (EED[7:0]) representative of at least one adjustable feature (C1, C2) of the electronic circuit (1, 8), this electronic device including at least first and second supply terminals (PAD_VDD, PAD_VSS), to which first and second supply voltages are applied (VDD, VSS) and at least one output terminal (PAD_OUT) at which the output signal from the electronic circuit is delivered,

Abstract: The device (1) includes a mixer (4) which generates a signal (S4) having a frequency (F4) equal to the difference between two frequencies (F2, F3), which are those of two signals (S2, S3) each generated by a generator (2, 3) and which vary parabolically as a function of the temperature (T) with quadratic coefficients (&bgr;1,&bgr;2) that are different to each other. In order for the frequency (F4) of the signal (S4) generated by the mixer (4) to be at least substantially independent of the temperature (T), the generators (2, 3) are arranged such that the ratio of the quadratic coefficients (&bgr;1,&bgr;2) is equal to the inverse of the ratio of values (F2r, F3r) that the corresponding frequencies (F2, F3) have at a determined temperature (Tr).

Abstract: The resonator according to the invention, which is intended to be mounted in a case, includes a tuning fork shaped part (42) with two parallel arms (44, 46) connected to each other by a base (48) and carrying electrodes (52, 54) to make them vibrate, these electrodes being connected to connection pads (60, 62) intended to be electrically connected to the exterior of the case. In accordance with the invention, the resonator (40) also includes a central arm (50) attached to the base (48) and located between the arms (44, 46) of the tuning fork shaped part (42), substantially equidistant from them, this central arm (50) having a greater mass than that of the arms of the tuning fork shaped part and the connection pads (60, 62) are carried by this central arm. This resonator (40) is mounted in a case of parallelepiped shape by fixing its central arm (50) to at least one support secured to the bottom of the case.

Abstract: The resonator according to the invention, which is intended to be mounted in a case, includes a tuning fork shaped part (42) with two parallel arms (44, 46) connected to each other by a base (48) and carrying electrodes (52, 54) to make them vibrate, these electrodes being connected to connection pads (60, 62) intended to be electrically connected to the exterior of the case. In accordance with the invention, the resonator (40) also includes a central arm (50) attached to the base (48) and located between the arms (44, 46) of the tuning fork shaped part (42), substantially equidistant from them, this central arm (50) having a greater mass than that of the arms of the tuning fork shaped part and the connection pads (60, 62) are carried by this central arm.

Abstract: The device (1) includes a mixer (4) which generates a signal (S4) having a frequency (F4) equal to the difference between two frequencies (F2, F3), which are those of two signals (S2, S3) each generated by a generator (2, 3) and which vary parabolically as a function of the temperature (T) with quadratic coefficients (&bgr;1,&bgr;2) that are different to each other.

Abstract: The present invention concerns a low frequency oscillator device including a quartz resonator (1) and an electronic maintenance circuit for maintaining the vibrations of said quartz resonator. According to the present invention, the quartz resonator is arranged to vibrate according to a torsional mode and therefore has a single cutting angle defined by a rotation at a determined angle (&thgr;) about the crystallographic axis X of the quartz crystal. This resonator includes in particular at least one undesired fundamental flexural vibrating mode at a first frequency and a desired fundamental torsional vibrating mode at a second frequency higher than said first frequency. Moreover, the electronic maintenance circuit is an inverter circuit (2) whose transconductance value (gm) is determined such that said device cannot oscillate according to the undesired fundamental flexural vibrating mode but according to the desired fundamental torsional vibrating mode of said resonator.

Abstract: The present invention concerns a low frequency oscillator device including a quartz resonator (1) and an electronic maintenance circuit for maintaining the vibrations of said quartz resonator. According to the present invention, the quartz resonator is arranged to vibrate according to a torsional mode and therefore has a single cutting angle defined by a rotation at a determined angle (&thgr;) about the crystallographic axis X of the quartz crystal. This resonator includes in particular at least one undesired fundamental flexural vibrating mode at a first frequency and a desired fundamental torsional vibrating mode at a second frequency higher than said first frequency. Moreover, the electronic maintenance circuit is an inverter circuit (2) whose transconductance value (gm) is determined such that said device cannot oscillate according to the undesired fundamental flexural vibrating mode but according to the desired fundamental torsional vibrating mode of said resonator.

Abstract: An angular speed measuring device comprises a rotating tuning fork transducer. First excitation electrodes excite the transducer to cause a first vibration in a first plane parallel to the planes of the principal faces of the transducer. The first vibration induces a second vibration in a plane perpendicular to the planes of the principal faces. The second vibration comprises a first component having an amplitude representative of the angular speed, and a second or parasite component. To avoid the distorting effects of the parasitic component of the second vibrations, the device is provided with a second set of excitation electrodes to excite a third vibration in the transducer, the third vibration being in phase opposition to the parasite component of the second vibration. Detection electrodes are provided for detecting vibrations in the direction perpendicular to the principal faces.

Abstract: The angular speed measuring device comprises:a transducer (1) intended to rotate at said angular speed;means (9) for generating a mechanical vibration of said transducer (1) in response to an excitation signal (OSC), this mechanical vibration comprising a parasite component and at least one useful component having an amplitude which is representative of said angular speed, andmeans for producing an electric detection signal (DET) representative of said mechanical vibration and also comprising a parasite component and at least one useful component having an amplitude which is representative of said angular speed.The device is characterized in that it further comprises processing means (23) for obtaining from said electric detection signal (DET), an analog measurement signal (S") the amplitude of which only depends on said useful component of the electric detection signal (DET), the parasite component of the electric detection signal being eliminated.

Abstract: An angular speed measuring device includes an oscillator for producing an excitation signal which induces mechanical vibrations in a rotating tuning fork, and an analog processing circuit for processing an electrical detection signal derived from the tuning fork. The analog processing circuit comprises a temperature-independent phase shifter responsive to the excitation signal for producing two signals in quadrature. The quadrature signals are applied to two multipliers which also receive the detection signal. The output signals from the multipliers are dependent on the fixed phase shift .phi. between the excitation signal and the detection signal, which is fixed for a given tuning fork, and on the variable phase shift .psi. which is a function of the rotational speed of the tuning fork, but the multiplier output signals are independent of temperature. After A/D conversion, the multiplier output signals are processed in a microprocessor to determine the angular speed.

Abstract: The device comprises a transducer which supplies, in response to an exciting signal, a detection signal that is representative of its angular speed, and a circuit which responds to this detection signal to supply an angular speed measurement signal. For this measurement signal to be readily usable regardless of the transducer, the circuit measures the phase difference between the detection signal and the exciting signal, this phase difference being representative of the angular speed of the transducer.