Abstract: An oscillator has an oscillator output emitting an oscillating signal. The oscillator includes oscillator cores which each have a same circuit topology. A set of configuration switches couple a selected number of oscillator cores in parallel to generate the oscillating signal. The oscillator cores are arranged with a symmetry around a central axis. The planar inductors of the oscillator cores are arranged in a petal-like pattern with the planar inductors forming the petals of the petal-like pattern. The selected coupling of the oscillator cores in made in response to a selected phase noise threshold of a modulation device which receives the oscillating signal.

Abstract: An oscillator has an oscillator output emitting an oscillating signal. The oscillator includes oscillator cores which each have a same circuit topology. A set of configuration switches couple a selected number of oscillator cores in parallel to generate the oscillating signal. The oscillator cores are arranged with a symmetry around a central axis. The planar inductors of the oscillator cores are arranged in a petal-like pattern with the planar inductors forming the petals of the petal-like pattern. The selected coupling of the oscillator cores in made in response to a selected phase noise threshold of a modulation device which receives the oscillating signal.

Abstract: An L-C resonant circuit with an adjustable resonance frequency, having a capacitor and a first inductor electrically coupled together and a second inductor magnetically coupled to the first inductor. Additionally, there is a control circuit to sense a signal representing a first current flowing through the first inductor and to force through the second inductor a second current that is a replica of the first current for setting the adjustable resonance frequency of the L-C resonant circuit.

Abstract: The mixer amplifier includes an amplification stage having a current source circuit and a plug filter adapted to modify the current circulating in the current source circuit. The amplification stage and a mixer stage amplify an incoming signal and transpose the frequency of the signal to a predetermined frequency. Resistors pairs measure the imbalance between two branches and have a relatively high value (thus creating a high-pass filter). When the branches are perfectly balanced, the voltage tapped by the non-inverting terminal of the operational amplifier A is zero. During an imbalance, this voltage rises. The output of the amplifier drives the TNP transistor T9, causing current to flow into branches to solicit the transistors T7 or T8 of the current source circuits and thus return the two branches to balance. Accordingly, a balance is maintained between the two branches by providing a feedback within the mixer amplifier.

Abstract: A radio-frequency receiver for, e.g., receiving GPS signals in a cellular telephone has an input, a first gain stage in the form of a linear low noise amplifier with voltage-voltage feedback and a resonant load, and a second gain stage based on a common source input transconductor. Associated with the input and the first gain stage is a filter comprising a notch filter part for rejecting an interfering signal, e.g. a cell phone transmitter signal, and, connected between the parallel resonant circuit and the input, a series capacitance which, in combination with the inductor of the parallel-resonant circuit, forms a series-resonant circuit to provide a low impedance path at a wanted signal frequency.

Abstract: An L-C resonant circuit with an adjustable resonance frequency, having a capacitor and a first inductor electrically coupled together and a second inductor magnetically coupled to the first inductor. Additionally, there is a control circuit to sense a signal representing a first current flowing through the first inductor and to force through the second inductor a second current that is a replica of the first current for setting the adjustable resonance frequency of the L-C resonant circuit.

Abstract: The mixer amplifier includes an amplification stage having a current source circuit and a plug filter adapted to modify the current circulating in the current source circuit. The amplification stage and a mixer stage amplify an incoming signal and transpose the frequency of the signal to a predetermined frequency. Resistors pairs measure the imbalance between two branches and have a relatively high value (thus creating a high-pass filter). When the branches are perfectly balanced, the voltage tapped by the non-inverting terminal of the operational amplifier A is zero. During an imbalance, this voltage rises. The output of the amplifier drives the TNP transistor T9, causing current to flow into branches to solicit the transistors T7 or T8 of the current source circuits and thus return the two branches to balance. Accordingly, a balance is maintained between the two branches by providing a feedback within the mixer amplifier.

Abstract: An opto-electronic instrument for remote temperature measurement having a measuring probe and a remote supply processing unit connected together by at least one optical fibre. The measuring probe includes at least one polarizer and a temperature sensitive element for receiving, modifying and retransmitting a luminous signal through the fibre which signal has been received from the luminous signal generator of the remote supply processing unit, which unit also includes a variable frequency filter controlled by a ramp generator for transforming the retransmitted luminous signal into a luminous signal, the intensity of which varies sinusoidally with time, and an opto-electrical transducer able to convert this latter luminous signal into a corresponding electrical signal of sinusoidal oscillation for which signal the period of oscillation is then calculated.

Abstract: This invention relates to a method for constructing multispectral infrared detectors formed by three HgCdTe photovoltaic elements disposed in the form of a sandwich. According to the invention, each photovoltaic element is constructed by preparing a suitable slice of HgCdTe, by polishing the faces of said slice, by chemically attacking the slice, by heating the slice in the presence of mercury inside a test tube within a furnace having a suitable temperature profile, by constructing the ground contact by catalytic deposition of gold, by cementing the slice onto a support, by depositing a layer of photoresist on the slice, by masking the photoresist with the exception of a small exposure region, by eliminating the photoresist in the exposure region, by grafting the slice and by depositing the upper contact and an entire flecting layer. The individual elements are finally assembled and electrically connected to output terminals.