Amplitude modulation type capacitive displacement sensor peak value demodulation circuit

A displacement sensor and peak detection technology, applied in the direction of instruments, electrical devices, electromagnetic means, etc., can solve the problems of signal phase error, open-loop instability, and difficulty in extracting peak signals, so as to reduce the output voltage error and design Flexibility to overcome the effects of low signal accuracy

Inactive Publication Date: 2017-03-29
李福霞
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Problems solved by technology

[0004] In order to overcome the shortcomings of the existing amplitude modulation capacitive displacement sensor peak detection circuit, which is unstable in the open loop, the signal is prone to phase error, and the peak signal is not easy to extract, improve the anti-noise performance of the peak detection circuit of the capacitive displacement sensor, and improve the accuracy of the peak signal. Invented and designed a peak detection circuit applied to the amplitude modulation capacitive displacement sensor

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  • Amplitude modulation type capacitive displacement sensor peak value demodulation circuit
  • Amplitude modulation type capacitive displacement sensor peak value demodulation circuit
  • Amplitude modulation type capacitive displacement sensor peak value demodulation circuit

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Embodiment Construction

[0015] figure 1 Among them, the whole sensor measurement system can be divided into three parts, the first part is the pre-circuit, the second part is the signal conditioning circuit, and the last part is the demodulation circuit. The output of the demodulation circuit is collected by the data collector, and the signal of the sensor is restored by calculating the collected data. When working, its carrier signal passes through the amplitude calculation circuit and signal conditioning circuit, the sensor displacement signal is modulated in the amplitude information, and then the signal is demodulated from the amplitude modulation wave through amplitude detection. The demodulation of the signal adopts the digital method.

[0016] figure 2 Among them, the pre-circuit is designed as an amplitude modulation operation circuit based on the transformer bridge, which modulates the sensor capacitance value information caused by the change of the capacitor plate gap into the amplitude ...

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Abstract

The invention provides an amplitude modulation type capacitive displacement sensor peak value demodulation circuit. A front circuit of the circuit provided by the invention can effectively inhibit stray capacitance. An error amplifier employs a symmetric OTA structure. The structure is simple, the output impedance is high, the transmission band is wide, the high frequency feature is good, the design is flexible, a peak value maintaining circuit employs time-delay acquisition signals, accurate phase information of signal peak values do not have to be known, starting time and rest time of sampling are controlled, and peak value extraction of signals can be accurately completed. The amplitude modulation type capacitive displacement sensor peak value demodulation circuit overcomes the disadvantages of low signal extraction accuracy, signal instability and quite high circuit structure complexity of a conventional peak value demodulation circuit.

Description

technical field [0001] The invention relates to a peak detection circuit, which is suitable for an amplitude modulation capacitive displacement sensor. Background technique [0002] With the development of modern industrial information technology, nanotechnology and microelectromechanical systems (MEMS) have been widely used in various industries. In nanotechnology, nanomeasurement technology, nanoprocessing technology and nanostructure are listed as the three major research topics of nanotechnology. Nano-measurement technology is an important part of nano-technology research, and no matter what kind of nano-measurement technology is inseparable from sensors. Sensors are the key foundation of automatic testing, control systems and information systems, and their technical level directly affects the level of automation and informatization. The higher the level of automation technology, the greater the dependence on sensor technology. Among the sensor families currently used ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01B7/02
Inventor 李福霞
Owner 李福霞
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