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A static capacitance compensation circuit and method for a quartz crystal microbalance

A static capacitance, quartz crystal technology, applied in electrical components, weighing equipment using elastically deformable parts, and using sonic/ultrasonic/infrasonic waves to analyze fluids, etc., can solve problems such as low accuracy and cumbersome compensation

Active Publication Date: 2021-04-02
GUANGZHOU UNIVERSITY
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The traditional capacitance compensation method requires manual compensation, which is cumbersome and has low accuracy

Method used

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  • A static capacitance compensation circuit and method for a quartz crystal microbalance
  • A static capacitance compensation circuit and method for a quartz crystal microbalance
  • A static capacitance compensation circuit and method for a quartz crystal microbalance

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Embodiment Construction

[0023] The present invention will be further described below in conjunction with drawings and embodiments.

[0024] see figure 1 , one A static capacitance compensation circuit for a quartz crystal microbalance, comprising: a potential control unit, a DC control unit, a static capacitance compensation unit, a signal attenuation unit and a signal acquisition unit;

[0025] Potential control unit includes: operational amplifier A1, operational amplifier A2, operational amplifier A3, resistor R1, resistor R2, resistor R3, resistor R4, single pole double throw switch S1, double pole double throw switch S2 and quartz crystal X1 to be compensated for capacitance; signal The positive pole of the source V2 is connected to the non-inverting input terminal of the operational amplifier A1, the output terminal of the operational amplifier A1 is connected to the non-inverting input terminal of the operational amplifier A2, and the output terminal of the operational amplifier A2 passes th...

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Abstract

The invention discloses a static capacitance compensation circuit and method of a quartz crystal microbalance. The static capacitance compensation circuit comprises a potential control unit, a direct-current control unit, a static capacitance compensation unit, a signal attenuation unit and a signal acquisition unit. In the scheme, a variable capacitance diode is added into the circuit; the size of the capacitance of the variable capacitance diode is controlled through the direct-current control unit; alternating voltage is applied onto the variable capacitance diode, so that the magnitude ofcurrent flowing through the variable capacitance diode is equal to the magnitude of current flowing through a quartz crystal static capacitor; the two are cancelled each other; therefore, the capacitance compensation purpose is achieved; the capacitance compensation unit is composed of an operational amplifier and the variable capacitance diode; the quartz crystal static capacitor is precisely compensated; automatic compensation of the static capacitor is realized; the compensation accuracy and stability are good; the capacitance compensation range is 2-30 pF; and the capacitance compensationprecision is + / -2 pF.

Description

technical field [0001] The invention relates to the technical field of electronic circuits, in particular to a static capacitance compensation circuit and method for a quartz crystal microbalance. Background technique [0002] Quartz crystal microbalance (QCM) is a quality detection instrument that is very sensitive to interface changes, and its measurement accuracy can reach nanogram level. The most basic principle is to use the piezoelectric effect of quartz crystal. The AT-cut quartz wafer used in QCM belongs to the thickness-shear model resonator. The working characteristics of the quartz wafer are similar to the RLC series-parallel circuit, which includes two branches (static circuit and dynamic circuit). The dynamic circuit is composed of the equivalent resistance , Equivalent capacitance and equivalent inductance are connected in series. The static circuit is composed of a parallel capacitor (also called static capacitor). Static capacitance is the additional capaci...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01G3/16G01N5/00G01N29/02H03M1/12
CPCG01G3/16G01N5/00G01N29/022H03M1/1205
Inventor 马英明刘振邦包宇牛利王伟
Owner GUANGZHOU UNIVERSITY
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