Electronic components comprising adjustable-capacitance micro-electro-mechanical capacitors
First Claim
1. Electronic component comprising:
- at least one micro-electromechanical capacitor with adjustable capacitance comprising two electrodes free to move with respect to each other, andmeans to create an electrostatic force capable of moving one of the two electrodes with respect to the other electrode and thus adjusting the capacitance of the capacitor,wherein said means to create an electrostatic force comprises a control circuit including;
a loop with a measurement input, a control input, and an output, anda current source outputting a measurement current to the measurement input;
and wherein said loop comprises;
a comparator having a first input connected to the measurement input, a second input connected to the control input, and an output providing a comparison signal,first and second DC current sources outputting respective currents of equal intensities and reverse polarities, anda switch selectively connecting the first DC current source or the second DC current source to the measurement input, depending on the comparison signal.
1 Assignment
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Accused Products
Abstract
Electronic component comprising at least one micro-electromechanical capacitor with adjustable capacitance comprising two electrodes free to move with respect to each other, and a control circuit (30) comprising measurement means (32) to measure the capacitance of the capacitor, means (35) of determining a capacitance difference between the measured capacitance of the capacitor and a set capacitance value, means (35 to 38) for injecting an electrical charge in a control electrode so as to create an electrostatic force capable of moving one of the two electrodes with respect to the other electrode and thus adjusting the capacitance of the capacitor, the injected electrical charge being determined as a function of the capacitance difference. This component is suitable for making an adjustable delay line, an adjustable quarter wave impedance transformer or for measuring the voltage, the power or the average intensity of an electrical signal.
18 Citations
20 Claims
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1. Electronic component comprising:
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at least one micro-electromechanical capacitor with adjustable capacitance comprising two electrodes free to move with respect to each other, and means to create an electrostatic force capable of moving one of the two electrodes with respect to the other electrode and thus adjusting the capacitance of the capacitor, wherein said means to create an electrostatic force comprises a control circuit including; a loop with a measurement input, a control input, and an output, and a current source outputting a measurement current to the measurement input; and wherein said loop comprises; a comparator having a first input connected to the measurement input, a second input connected to the control input, and an output providing a comparison signal, first and second DC current sources outputting respective currents of equal intensities and reverse polarities, and a switch selectively connecting the first DC current source or the second DC current source to the measurement input, depending on the comparison signal. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20)
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Specification