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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

Inactive Publication Date: 2011-03-30
SUZHOU R&D CENT OF NO 214 RES INST OF CHINA NORTH IND GRP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the papers on the application of AD669, the zero position and range output of the circuit are mainly controlled by precision resistors or precision adjustable potentiometers. Since the precision resistors are mostly nominal values, it is difficult to accurately control the voltage output, and the precision adjustable potentiometer Although the accuracy of the output zero position and range parameters can be guaranteed to a certain extent, due to the limitation of the package size, the size of the multi-channel D / A conversion circuit cannot meet the needs of miniaturization

Method used

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

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Embodiment 1

[0031] Embodiment 1: Fine-tuning technology for zero position and range parameters of a single-channel digital-to-analog conversion circuit.

[0032] See attached figure 1 And attached figure 2 shown.

[0033] High-precision fine-tuning technology of single-channel digital-to-analog conversion circuit zero position and range parameters, including the following steps:

[0034] The first is the substrate selection: according to the design such as figure 1 After the software layout and wiring of the fine-tuning circuit shown, the low-temperature co-fired ceramic technology is used to make a rigid high-density multilayer interconnection substrate with green ceramic materials, and the physical and electrical interconnection of a single-channel digital-to-analog conversion circuit is realized using the substrate as a carrier. .

[0035] Then, make thick film resistors:

[0036] (1) Selection of resistance slurry: select the resistance slurry with a square resistance of 3-5mΩ / □...

Embodiment 2

[0059] Embodiment 2: Fine-tuning technology of zero position and range parameters of multi-channel digital-to-analog conversion circuit.

[0060] See attached image 3 shown.

[0061] When fine-tuning the zero position and range parameters of the multi-channel digital-to-analog conversion circuit, the multi-channel digital-to-analog conversion circuit is first gated with a multi-channel switch, and then the zero-position and range parameters of the circuit are fine-tuned.

[0062] The lower 4 bits (D0-D3) of the input digital signal are the lower 4 bits of the digital signal and the multiplexing signal selected by the multi-way switch.

[0063] The specific gating and fine-tuning implementation steps are as follows:

[0064] ① Set the write control signal to low, and select the channel of the digital-to-analog conversion circuit through the 4-digit digital dial switch;

[0065] ②The latch control signal is set high, and the selected channel is latched;

[0066] ③The write ...

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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.

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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Application Information

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IPC IPC(8): H03M1/10
Inventor 鞠莉娜刘海亮姚道俊
Owner SUZHOU R&D CENT OF NO 214 RES INST OF CHINA NORTH IND GRP
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