High-resolution wide-range quartz flexible accelerometer acquisition circuit design method

Abstract

The invention discloses a high-resolution wide-range quartz flexible accelerometer acquisition circuit design method. Two comparators are additionally arranged on the basis of an existing I/F conversion circuit; when the output of the current integrator in the I/F conversion circuit does not reach the threshold value within the time t, the input current of the conversion circuit is judged to be small current, and the processor executes a small current resolving program; when the output of a current integrator in the I/F conversion circuit reaches a threshold value within the time t, the input current of the conversion circuit is judged to be large current, and the processor executes a large current resolving program; resolution of large and small currents is completed by two sets of systems, it can be ensured that the conversion circuit can update output in a short time when small currents are input, the threshold voltage of the conversion circuit can be set to be large, and the problem of distortion generated when large currents are input due to the fact that the threshold voltage is set to be too small does not exist. According to the invention, the output real-time performance of the conversion circuit is improved, and the problem of mutual contradiction between high resolution and wide range of the existing conversion circuit is solved on the premise of ensuring the precision.

Description

technical field [0001] The invention relates to the technical field of a quartz flexible accelerometer acquisition circuit, in particular to a design method of a high-resolution large-range quartz flexible accelerometer acquisition circuit. Background technique [0002] Quartz flexible accelerometer is the core component of high-precision inertial navigation system, which has the advantages of high precision and good anti-interference. At present, the quartz flexible accelerometer expresses the magnitude of the acceleration of the carrier by the magnitude of the output current, but the current is an analog quantity and cannot be directly recognized by the computer, and the output current needs to be converted into a digital quantity. High-precision quartz flexible accelerometers can output currents from several μA to tens of mA, which puts forward higher requirements on the resolution and range of the conversion circuit. At present, high-precision quartz flexible accelerome...

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Problems solved by technology

[0003] The purpose of the present invention is to provide a high-resolution large-range quartz flexible accelerometer acquisition circuit design method, without affecting the accuracy of the I / F conversion circuit to convert large currents, improve the conversion resolution for small currents, overcome the traditional I / F circuit has the problem of conflicting high resolution and large range. This circuit has the advantages of large switchable range, high resolution and good real-time performance.

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