摘要:
A method for detecting displacements of a micro-electromechanical sensor (101) including a fixed body (3) and a mobile mass (4), forming at least a first sensing capacitor (107) and a second sensing capacitor (108), which are connected to a first input terminal (102) and, respectively, to a first output terminal (104) and to a second output terminal (105) of the sensing circuit and have a rest common sensing capacitance (Cs). The method includes the steps of: closing a first negative-feedback loop (136), which comprises the first sensing capacitor (107) and the second sensing capacitor (108) and a differential amplifier (124); supplying to at least one input (124b) of the differential amplifier (124) a staircase sensing voltage (Vs) through driving capacitors (121, 122) so as to produce variations (ΔVc) of an electrical driving quantity (Vc) which are inversely proportional to the common sensing capacitance (Cs); and driving the sensor (101) with the electrical driving quantity (Vc) .
摘要:
A method for detecting displacements of a micro-electromechanical sensor (101) including a fixed body (3) and a mobile mass (4), forming at least a first sensing capacitor (107) and a second sensing capacitor (108), which are connected to a first input terminal (102) and, respectively, to a first output terminal (104) and to a second output terminal (105) of the sensing circuit and have a rest common sensing capacitance (Cs). The method includes the steps of: closing a first negative-feedback loop (136), which comprises the first sensing capacitor (107) and the second sensing capacitor (108) and a differential amplifier (124); supplying to at least one input (124b) of the differential amplifier (124) a staircase sensing voltage (Vs) through driving capacitors (121, 122) so as to produce variations (ΔVc) of an electrical driving quantity (Vc) which are inversely proportional to the common sensing capacitance (Cs); and driving the sensor (101) with the electrical driving quantity (Vc) .
摘要:
A device for controlling the frequency of resonance of an oscillating micro-electromechanical system includes: a microstructure (2), having a first body (10) and a second body (11), which is capacitively coupled to the first body (10) and elastically oscillatable with respect thereto at a calibratable frequency of resonance (É R ) a relative displacement (”Y) between the second body (11) and the first body (10) being detectable from outside; and an amplifier (21) associated to the microstructure (2) for detecting the relative displacement (”Y). DC decoupling elements (23) are arranged between the amplifier (21) and the microstructure (2).
摘要:
A micro-electromechanical device includes a semiconductor body (5), in which at least one first microstructure (2) and one second microstructure (3) of reference are integrated. The first microstructure (2) and the second microstructure (3) are arranged in the body (5) so as to undergo equal strains as a result of thermal expansions of said body (5; 105; 205; 305). Furthermore, the first microstructure (2) is provided with movable parts (6) and fixed parts (7) with respect to the body (5), and the second microstructure (3) has a shape that is substantially symmetrical to the first microstructure (2) and is fixed with respect to the body (5).