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high precision converter

A converter, high-precision technology, used in code conversion, analog/digital conversion, analog/digital conversion calibration/testing, etc., can solve problems such as the inability to meet the design requirements of A/D and D/A converters

Active Publication Date: 2022-04-12
CHENGDU SINO MICROELECTRONICS TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In order to further improve the conversion accuracy, it is necessary to introduce calibration measures to the cell array, otherwise it cannot meet the design requirements of A / D and D / A converters with 12-bit and above precision

Method used

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Experimental program
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Embodiment

[0045] The design scheme of the classic N-bit cell array with trimming array in the present invention can be widely used in capacitor arrays and resistor arrays in high-precision A / D and D / A converters.

[0046] For the capacitor array, taking the capacitive DA core of the 12-bit SAR ADC as an example, the trimming array is as follows: image 3 as shown, figure 2 The equivalent structure diagram of the circuit shown is Figure 4 shown.

[0047] For the resistor array, take the resistor core of the 12-bit R-2R DAC as an example, and adjust the array as Figure 5 as shown, figure 2 The equivalent structure diagram of the circuit shown is Image 6 shown.

[0048] in conclusion

[0049] In the present invention, part of the content takes a 12-bit high-precision converter as an example, and can be extended to the case where the low bits include N bits;

[0050] In the present invention, the trimming array of part of the content is taken as an example to include 6 trimming mo...

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PUM

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Abstract

The high-precision converter relates to an integrated circuit. The present invention includes a main unit array composed of N conversion units, and is characterized in that, in the high X-bit conversion units of the main unit array, each conversion unit is paired and connected with a trimming array , N‑X≤10, N and X are both natural numbers. The beneficial effect of the present invention is that in the main unit array, all the modules use the same module to ensure that the finished circuit can reach the maximum matching accuracy provided by the process manufacturer, and at the same time, a trimming array is added to the high X bits to ensure that the final finished circuit has a precision of 12-bit and above precision requirements.

Description

technical field [0001] The invention relates to integrated circuits, in particular to high-precision A / D and D / A converter circuits. Background technique [0002] The high-precision A / D converter can convert any analog signal level within its range to its unique corresponding digital code output, and the converted output result can be used as an operation command to directly control the whole system to perform corresponding operations. [0003] The high-precision D / A converter can convert any digital input code word within its range into its unique corresponding analog signal output, and the converted output result can be used as an operation command to directly control the whole system to perform corresponding operations. [0004] It can be seen from the above that for high-precision A / D and D / A converters, the uniqueness of the conversion results will directly affect the correctness of the operation of the whole system. [0005] In order to ensure the uniqueness of the co...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H03M1/10
CPCH03M1/1009
Inventor 杨平齐旭廖志凯岑远军李大刚成文轩
Owner CHENGDU SINO MICROELECTRONICS TECH CO LTD