MEMS device front-end charge amplifier
First Claim
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1. An apparatus comprising:
- a charge amplifier configured to couple to a microelectromechanical system (MEMS) device and to provide sense information of a proof mass of the MEMS device;
a feedback circuit configured to receive the sense information and to provide feedback to an input of the charge amplifier; and
wherein the charge amplifier includes a transfer function having a first pole at a first frequency, a second pole at a second frequency, and one zero at a third frequency; and
wherein the first frequency and the second frequency are at or below a resonance frequency of the proof mass.
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Abstract
This document discusses, among other things, apparatus and methods for a front-end charge amplifier. In certain examples, a front-end charge amplifier for a microelectromechanical system (MEMS) device can include a charge amplifier configured to couple to the MEMS device and to provide sense information of a proof mass of the MEMS device, a feedback circuit configured to receive the sense information and to provide feedback to an input of the charge amplifier, and wherein the charge amplifier includes a transfer function having a first pole at a first frequency, a second pole at a second frequency, and one zero at a third frequency.
281 Citations
18 Claims
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1. An apparatus comprising:
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a charge amplifier configured to couple to a microelectromechanical system (MEMS) device and to provide sense information of a proof mass of the MEMS device; a feedback circuit configured to receive the sense information and to provide feedback to an input of the charge amplifier; and wherein the charge amplifier includes a transfer function having a first pole at a first frequency, a second pole at a second frequency, and one zero at a third frequency; and wherein the first frequency and the second frequency are at or below a resonance frequency of the proof mass. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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12. A method comprising:
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receiving a sense signal from a proof mass of a microelectromechanical system (MEMS) device; and providing a voltage representative of a capacitance of the MEMS device using the sense signal and an amplifier having a first transfer function pole at a first frequency, a second transfer function pole at a second frequency, and one transfer function zero at a third frequency; and wherein the first frequency and the second frequency are below or about equal to a resonance frequency of the proof mass. - View Dependent Claims (13, 14, 15, 16)
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17. A system comprising:
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a microelectromechanical system (MEMS) sensor; and a front-end charge amplifier configured to provide sense information of the MEMS sensor, the front-end charge amplifier comprising; a charge amplifier configured to couple to the MEMS sensor and to provide the sense information of a proof mass of the MEMS sensor; a feedback circuit configured to receive the sense information and to provide feedback to an input of the charge amplifier; and wherein the charge amplifier includes a transfer function having a first pole at a first frequency, a second pole at a second frequency, and one zero at a third frequency; and wherein the first frequency and the second frequency are at or below a resonance frequency of the proof mass. - View Dependent Claims (18)
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Specification