Front end circuit of accelerometer and processing method of acceleration signal

A front-end circuit and accelerometer technology, applied in the direction of measuring acceleration, speed/acceleration/shock measurement, electrical components, etc., can solve the problem of high power consumption, failure to remove low-frequency 1/f noise and input offset voltage, and signal-to-noise ratio Not advanced question

Active Publication Date: 2019-01-15
CSMC TECH FAB2 CO LTD
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  • Abstract
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  • Application Information

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Problems solved by technology

[0006] The analog front end of the traditional accelerometer does not remove the low-frequency 1/f noise and the input offset voltage (offset), so that the signal-to-noise ratio of

Method used

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  • Front end circuit of accelerometer and processing method of acceleration signal
  • Front end circuit of accelerometer and processing method of acceleration signal
  • Front end circuit of accelerometer and processing method of acceleration signal

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Embodiment Construction

[0026] In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the present invention, not to limit the present invention.

[0027] figure 2 It is a block diagram of the front-end circuit of the accelerometer of an embodiment. The front-end circuit 10 is used to connect the acceleration sensor 20 to obtain the original analog signal, and perform front-end processing on the original analog signal. The front-end circuit 10 includes an amplifier circuit 100 and a low-pass filter circuit 200 . The amplification circuit 100 is used to connect with the acceleration sensor 20, receive the original analog signal, and amplify the original analog signal. The low-pass filter circuit 200 is connected to the amplifying circuit 10...

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Abstract

The invention relates to a front end circuit of accelerometer and a processing method of acceleration signal. The front end circuit is used to connect an acceleration sensor to obtain an original analog signal, and performing front end processing on the original analog signal. The front end circuit comprises: an amplifying circuit, which configured to be connected to the acceleration sensor to receive the original analog signal, and amplify the original analog signal; a low-pass filter circuit, which connected to the amplifying circuit for performing low-pass filtering processing on the amplified signal to eliminate noise. The amplifying circuit comprises: a first chopper circuit, which configured to be connected to the acceleration sensor to receive the original analog signal, and performa first chopping process on the original analog signal; an operational amplifier circuit, which connected to the first chopper circuit to amplify the output signal of the first chopper circuit; a second chopper circuit, which connected to the operational amplifier circuit to perform the second chopping process on the amplified signal. The noise in the front end circuit is small.

Description

technical field [0001] The invention relates to the technical field of acceleration sensors, in particular to a front-end circuit of an accelerometer and an acceleration signal processing method. Background technique [0002] MEMS accelerometers are accelerometers manufactured using MEMS technology. Due to the use of micro-mechanical technology, it has the advantages of small size, light weight and low power consumption. Widely used in vibration detection, orientation detection, consumer applications, motion recognition and other fields. [0003] Piezoresistive accelerometers are made using the piezoelectric effect of PZT (lead zirconate titanate) ceramics. When PZT ceramic is stressed, its resistance value changes. By connecting the piezoresistor bridge, the change of resistance value is converted into the change of voltage. It detects, amplifies and corrects through a special ASIC, and then outputs a binary digital signal corresponding to the acceleration value. [00...

Claims

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Application Information

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IPC IPC(8): G01P15/00H03F3/45H03H11/38
CPCG01P15/00H03F3/45197H03H11/38
Inventor 王雪艳
Owner CSMC TECH FAB2 CO LTD
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