Scale factor temperature compensating method of current frequency conversion circuit

A technology of current frequency conversion and scaling factor, applied in the direction of analog/digital conversion calibration/testing, etc., can solve problems such as inability to cope with nonlinear temperature compensation curve, key components cannot achieve a balance between performance and cost, and achieve flexible design Convenience, low-cost effect

Active Publication Date: 2016-02-03
QINGDAO AEROSPACE SEMICON RES INST
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Problems solved by technology

[0003] Existing technologies usually rely solely on improving the accuracy level of key components to achieve a balance between performance and cost, and hardware compensation methods cannot cope with the problem of nonlinear temperature compensation curves

Method used

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  • Scale factor temperature compensating method of current frequency conversion circuit
  • Scale factor temperature compensating method of current frequency conversion circuit
  • Scale factor temperature compensating method of current frequency conversion circuit

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Embodiment Construction

[0025] Hereinafter, the present invention will be further described in conjunction with the drawings and specific embodiments.

[0026] Such as Figure 1-3 As shown, the present invention is realized in this way: according to the ambient temperature value obtained by the temperature sensor test, output the corresponding digital signal, adjust the feedback reference current after D / A conversion, change the output frequency of the conversion circuit in real time, and reduce the impact of temperature change on the output The effect of frequency. The temperature compensation circuit mainly includes three units: a temperature measurement circuit, a central processing circuit and a D / A conversion circuit.

[0027] The function of the temperature measurement circuit unit is to collect temperature information of the circuit board and provide it to the central processing circuit. After the temperature acquisition module in the central processing circuit unit obtains the temperature i...

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Abstract

The invention belongs to the analog digital mixed circuit technology, particularly relates to a scale factor temperature compensating method of a current frequency conversion circuit. The method comprises the following steps: step 1, storing compensating values of specified temperature points, further comprising: step 1.1, obtaining the average value of the scale factor of a circuit to be compensated at normal temperature as a datum point; step 1.2, obtaining the average value of the scale factors of multiple temperature points (except normal temperature) of the circuit to be compensated and calculating the deviation from the datum point; and step 1.3, storing; step 2, compensating the circuit to be compensated with a compensation value stored in advance, further comprising: step 2.1, measuring environment temperature in real time with a temperature sensor; step 2.2, carrying out table lookup or interpolation calculation to determine the compensation value; and step2.3, carrying out temperature compensation. The processor circuit is implemented through FPGA, is flexible in design, can be applied to software for carrying out error compensation to measurement signals, is capable of compensating the scale factor of a temperature curve with the nonlinear characteristic and thereby further providing guarantee for high precision, miniaturization and low cost of the circuit.

Description

technical field [0001] The invention belongs to the analog-digital hybrid circuit technology, in particular to a method for temperature compensation of a current / frequency conversion circuit, in particular to a digital temperature compensation method capable of compensating the temperature characteristic of the scale factor of the current / frequency conversion circuit. technical background [0002] The current / frequency conversion circuit (belonging to the AD conversion circuit) is one of the important components of the inertial navigation system. It is used together with the accelerometer in the inertial navigation system to convert the output current of the accelerometer into a digital pulse signal proportional to it to adapt to Counting needs of the navigation computer counter interface. Since the working performance of electronic components changes with temperature, the temperature factor is an important factor affecting the working performance of the conversion circuit, ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H03M1/10
Inventor 董建树王蒙罗延明庞葳李劲涛赵晨昊
Owner QINGDAO AEROSPACE SEMICON RES INST
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