Current digital to analog conversion method and device

A digital-to-analog conversion and current-mode technology, applied in the direction of digital-to-analog converters, can solve the problems of mismatch, low DNL and INL, and achieve the effect of overcoming the mismatch

Active Publication Date: 2015-01-07
ETOWNIP MICROELECTRONICS BEIJING CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The method and device can solve the mismatch problem between MSB units, so that the two indicators of DNL and INL are very low, thereby realizing a high-precision current-mode DAC

Method used

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  • Current digital to analog conversion method and device
  • Current digital to analog conversion method and device
  • Current digital to analog conversion method and device

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Embodiment Construction

[0038] The technical solution of the present invention will be further described in detail below with reference to the accompanying drawings and a DAC with a thermometer code structure as an example.

[0039] The embodiment of the present invention discloses a current-mode digital-to-analog conversion method, wherein the DAC implementation method includes the following steps:

[0040] For each MSB cell current I in the MSB array MSB and the total current I of all LSB cells in the LSB array LSB(总) The current error ΔI between them is converted into a time error Δt for measurement, and the current error ΔI between the current of each MSB unit and the total current of all LSB units is calculated;

[0041] According to each MSB cell current I MSBThe total current I with all LSB cells LSB(总) Between the current error ΔI, the input digital signal is preprocessed to eliminate the error;

[0042] Perform digital-to-analog conversion on the preprocessed digital signal to output an ...

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Abstract

The invention relates to a current digital to analog conversion method which is characterized by comprising the following steps of: measuring a time error converted from a current error between current of each most significant bit (MSB) unit in an MSB array and total current of all least significant bit (LSB) units in an LSB array, and calculating a current error between the current of each MSB unit and the total current of all the LSB units; performing error elimination preprocessing on an input digital signal according to the current error between the current of each MSB unit and the total current of all the LSB units; and performing digital to analog conversion on the preprocessed digital signal, and thus outputting a precise analog signal. According to the current digital to analog conversion method, the problem that the MSB units are not matched caused by technical factors on a chip is solved, and high precision digital to analog conversion is realized.

Description

technical field [0001] The invention relates to the field of digital signal processing, in particular to a current-mode digital-to-analog conversion method and device. Background technique [0002] With the rapid development of digital signal processing technology, the speed and precision requirements of a digital-to-analog converter (Digital to Analog Converter, DAC) are getting higher and higher. [0003] In the prior art, the current-mode DAC has always been the optimal structure for the digital-to-analog converter DAC. However, in the current mode DAC, the current source is the most important unit, especially the matching degree of the current source directly determines the performance parameters of the digital-to-analog converter. [0004] The n-bit precision current DAC circuit is generally composed of two parts, one part is composed of 2 MSB (Most Significant Bit, the most significant bit) unit current source a -1 cell array, called MSB array; the other part is comp...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H03M1/66
Inventor 朱循宇
Owner ETOWNIP MICROELECTRONICS BEIJING CO LTD
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