High-accuracy fine adjustment method for zero position and measuring range parameters of digital-to-analogue conversion circuit

A digital-to-analog conversion circuit, high-precision technology, applied in the direction of analog/digital conversion calibration/testing, etc., can solve the problems of multi-channel D/A conversion circuit that cannot meet the needs of miniaturization, and it is difficult to accurately control the voltage output, etc. Achieve the effect of meeting high density, improving consistency and improving accuracy
CN101997546AInactive Publication Date: 2011-03-30SUZHOU R&D CENT OF NO 214 RES INST OF CHINA NORTH IND GRP
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Patent Information

Authority / Receiving Office
CN · China
Current Assignee / Owner
SUZHOU R&D CENT OF NO 214 RES INST OF CHINA NORTH IND GRP
Publication Date
2011-03-30
Estimated Expiration
Not applicable · inactive patent

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Abstract

The invention relates to a high-accuracy fine adjustment method for the zero position and measuring range parameters of a digital-to-analogue conversion circuit, which comprises the following steps of: connecting a thick-film resistor for realizing fine adjustment in the digital-to-analogue conversion circuit; manufacturing a laser fine adjustment special probe card connected with the thick-film resistor and an electrical detecting instrument; and presetting electrical performance parameters of the zero position and the measuring range of the circuit, inputting a digital signal source to the digital-to-analogue conversion circuit, controlling a laser beam to form a laser incision on the thick-film resistor by utilizing a programmable fine adjustment unit of a laser fine adjustment machineso as to perform active fine adjustment of the thick-film resistor, monitoring the zero position and output voltage value of full measuring range of the digital-to-analogue conversion circuit on linein real time by utilizing the electrical detecting instrument, so that the output reaches the preset electrical performance parameter values accurately to realize the high-accuracy fine adjustment ofthe zero position and measuring range of the digital-to-analogue conversion circuit. By the method, the high density and miniaturization requirements of multiple paths of digital-to-analogue conversion circuits can be met, the consistency of the output of multiple paths of digital-to-analogue conversion circuits is improved effectively, and the accuracy of the electrical performance parameters offrameworks of like products can be improved simultaneously and effectively.
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Description

technical field

[0001] The invention relates to a high-precision fine-tuning method for zero position and range parameters of a digital-to-analog conversion circuit. Background technique

[0002] The digital-to-analog conversion (DAC) circuit is a special circuit that converts the input digital quantity into an analog quantity output. The AD669 digital-to-analog conversion circuit produced by American AD Company can realize unipolar or bipolar analog quantity through programmable pins. Output, but the accuracy of the zero position and range parameters of the output analog quantity is adjusted through an external resistor.

[0003] At present, among the published patents related to digital-to-analog conversion circuit (DAC) zero position and range parameter fine-tuning technology, such as the patent No. 200410055976.5 "Voltage generation circuit and method for voltage fine-tuning using digital / analog conversion circuit" In, the fuse is used to fine-tune the voltage. Patent ...

Claims

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