Abstract:
Embodiments of the subject application provide a method for operating a micro-electro-mechanical system (MEMS) tuning fork gyroscope. The method includes oscillating a voltage on a first sense electrode out-of-plane from and proximate a first side of a first proof mass between a first voltage and a second voltage at a first frequency. The method also includes oscillating a voltage on a second sense electrode out-of-plane from and proximate a second side of the first proof mass between the first voltage and the second voltage at the first frequency and 180 degrees out-of-phase with the voltage on the first sense electrode. The method also includes generating a rate signal corresponding to a rotation rate of the first proof mass by first demodulating an out-of-plane signal from the first proof mass at the first frequency and second demodulating the out-of-plane signal in phase with in-plane motion of the first proof mass.
Abstract:
A micro-electro-mechanical systems (MEMS) device comprises at least one proof mass configured to have a first voltage and a motor motion in a first horizontal direction. At least one sense plate is separated from the proof mass by a sense gap, with the sense plate having an inner surface facing the proof mass and a second voltage different than the first voltage. A set of stop structures are on the inner surface of the sense plate and are electrically isolated from the sense plate. The stop structures are configured to prevent contact of the inner surface of the sense plate with the proof mass in a vertical direction. The stop structures have substantially the same voltage as that of the proof mass, and are dimensioned to minimize energy exchange upon contact with the proof mass during a shock or acceleration event.
Abstract:
Embodiments of the subject application provide a method for operating a micro-electro-mechanical system (MEMS) tuning fork gyroscope. The method includes oscillating a voltage on a first sense electrode out-of-plane from and proximate a first side of a first proof mass between a first voltage and a second voltage at a first frequency. The method also includes oscillating a voltage on a second sense electrode out-of-plane from and proximate a second side of the first proof mass between the first voltage and the second voltage at the first frequency and 180 degrees out-of-phase with the voltage on the first sense electrode. The method also includes generating a rate signal corresponding to a rotation rate of the first proof mass by first demodulating an out-of-plane signal from the first proof mass at the first frequency and second demodulating the out-of-plane signal in phase with in-plane motion of the first proof mass.
Abstract:
Systems and methods for improving MEMS gyroscope start time are provided. In one embodiment, a circuit board for a MEMS gyroscope system comprises: a proof mass assembly; a proof mass control loop coupled to the proof mass assembly by a first proof mass motion sensor pickup line and a second proof mass motion sensor pickup line, where the proof mass control loop generates a set of drive signals that operate the proof mass assembly using a first capacitive signal from the first proof mass motion sensor pickup line and a second capacitive signal from the second proof mass motion sensor pickup line; and a tunable capacitive coupler connected to at least one of the first or the second proof mass motion sensor pickup lines, where the tunable capacitive coupler varies at least one of the first and second charge signals as a function of the drive signals.
Abstract:
A method of controlling exposed glass charging in a micro-electro-mechanical systems (MEMS) device is disclosed. The method includes providing a MEMS device comprising a proof mass positioned apart from at least one sense plate and at least one outboard metallization layer, wherein at least one conductive glass layer is coupled to the sense plate and the outboard metallization layer, the conductive glass layer including at least one exposed glass portion near the proof mass; and applying a first voltage to the sense plate and a second voltage to the outboard metallization layer. The first voltage is separated from the second voltage by a predetermined voltage level such that the exposed glass portion has an average voltage corresponding to a voltage midway between the first voltage and the second voltage.
Abstract:
A method of controlling exposed glass charging in a micro-electro-mechanical systems (MEMS) device is disclosed. The method includes providing a MEMS device comprising a proof mass positioned apart from at least one sense plate and at least one outboard metallization layer, wherein at least one conductive glass layer is coupled to the sense plate and the outboard metallization layer, the conductive glass layer including at least one exposed glass portion near the proof mass; and applying a first voltage to the sense plate and a second voltage to the outboard metallization layer. The first voltage is separated from the second voltage by a predetermined voltage level such that the exposed glass portion has an average voltage corresponding to a voltage midway between the first voltage and the second voltage.
Abstract:
Systems and methods for improving MEMS gyroscope start time are provided. In one embodiment, a circuit board for a MEMS gyroscope system comprises: a proof mass assembly; a proof mass control loop coupled to the proof mass assembly by a first proof mass motion sensor pickup line and a second proof mass motion sensor pickup line, where the proof mass control loop generates a set of drive signals that operate the proof mass assembly using a first capacitive signal from the first proof mass motion sensor pickup line and a second capacitive signal from the second proof mass motion sensor pickup line; and a tunable capacitive coupler connected to at least one of the first or the second proof mass motion sensor pickup lines, where the tunable capacitive coupler varies at least one of the first and second charge signals as a function of the drive signals.
Abstract:
A micro-electro-mechanical systems (MEMS) device comprises at least one proof mass configured to have a first voltage and a motor motion in a first horizontal direction. At least one sense plate is separated from the proof mass by a sense gap, with the sense plate having an inner surface facing the proof mass and a second voltage different than the first voltage. A set of stop structures are on the inner surface of the sense plate and are electrically isolated from the sense plate. The stop structures are configured to prevent contact of the inner surface of the sense plate with the proof mass in a vertical direction. The stop structures have substantially the same voltage as that of the proof mass, and are dimensioned to minimize energy exchange upon contact with the proof mass during a shock or acceleration event.