Current/frequency conversion circuit linearity and symmetry digital compensation method
A technology of frequency conversion circuit and linearity compensation, which is applied in the direction of logic circuit, electrical variable adjustment, electrical components, etc., can solve problems such as high requirements for debugging personnel, complicated operation process, single charge and discharge power error of switching circuit, etc., to achieve Improve debugging efficiency, solve complex operations, and achieve high compensation accuracy
Active Publication Date: 2015-01-07
THE GENERAL DESIGNING INST OF HUBEI SPACE TECH ACAD
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Problems solved by technology
Affected by the actual parameters of the conversion circuit components, there is an error in the single charge and discharge of the switching circuit, which leads to the nonlinearity of the conversion circuit, and because the positive and negative channels are independent and asymmetrical, it is necessary to analyze the non-linearity of the current / frequency conversion circuit. Compensation for linearity and symmetry
[0003] In the current production process, the linearity of the conversion circuit is adjusted by changing the base saturation current of the switching transistor in the current / frequency conversion circuit, and the symmetry of the conversion circuit is adjusted by changing the positive and negative constant current source currents. Estimation and repeated trial and error adjustment, the operation process is complicated, the accuracy is limited, and the requirements for debugging personnel are high, which cannot meet the needs of mass production
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[0036] The present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.
[0037] The input frequency of the D flip-flop of the current / frequency conversion circuit is 80kHz, and the output is a pulse signal, which is active at high level. In the case of large current input, the output pulse of the D flip-flop has a sticking phenomenon, so it is necessary to perform a logical AND operation on the output pulse of the D flip-flop and the input clock, and the pulse after the logical AND is the number of subdivided pulses n i .
[0038] Input different current values I to the current / frequency conversion circuit through a constant current source i (The selection of the current value should be selected according to the uniform or uneven range of the current / frequency conversion circuit, including zero current), measure and record the number of pulses output by the D flip-flop within a certain interval (for exa...
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The invention discloses a current / frequency conversion circuit linearity and symmetry digital compensation method. The current / frequency conversion circuit linearity and symmetry digital compensation method comprises the steps of measuring and recording D trigger output pulse number and subdivided pulse number when different current values are input into a current / frequency conversion circuit; confirming conversion circuit linearity compensation factors and performing compensation to a conversion circuit output in digital mode; measuring and obtaining symmetrical coefficient and zero coefficient of the current / frequency conversion circuit; and confirming symmetrical compensation coefficient of the conversion circuit and performing real-time compensation to the conversion circuit output in digital mode. By means of the current / frequency conversion circuit linearity and symmetry digital compensation method, the problems including complicated operation, effective accuracy, high demands on debugging persons and unsatisfied batch production demand in the current production debugging process is effectively solved.
Description
technical field [0001] The invention relates to the technical field of measurement of current-type devices, in particular to a digital compensation method for linearity and symmetry of a current / frequency conversion circuit. Background technique [0002] The measurement of current-mode devices usually uses a current / frequency conversion circuit, and its output pulse frequency is proportional to the input current. Affected by the actual parameters of the conversion circuit components, there is an error in the single charge and discharge of the switching circuit, which leads to the nonlinearity of the conversion circuit, and because the positive and negative channels are independent and asymmetrical, it is necessary to analyze the non-linearity of the current / frequency conversion circuit. Linearity and symmetry are compensated. [0003] In the current production process, the linearity of the conversion circuit is adjusted by changing the base saturation current of the switchi...
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IPC IPC(8): G05F1/565H03K19/00
Inventor 黄丽娟邵志浩万志江吕江涛李星善陆俊清
Owner THE GENERAL DESIGNING INST OF HUBEI SPACE TECH ACAD
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