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A Current Steering Digital-to-Analog Converter Based on Thermometer Code

A technology of digital-to-analog converter and thermometer code, which is applied in the direction of code conversion, analog/digital conversion, electrical components, etc., can solve the problems affecting the accuracy of digital-to-analog conversion, mismatch, etc., and achieve the goal of improving conversion accuracy and small current mismatch Effect

Active Publication Date: 2022-05-20
SOUTHEAST UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] However, conventional current-steering digital-to-analog converters use current source arrays whose current values ​​are binary multiples. Since the current sources are limited by the matching accuracy of resistance values, the resistance values ​​are not exactly the same due to process, photolithography and other reasons. time, and then inevitably there is a mismatch, which directly affects the accuracy of digital-to-analog conversion

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  • A Current Steering Digital-to-Analog Converter Based on Thermometer Code
  • A Current Steering Digital-to-Analog Converter Based on Thermometer Code
  • A Current Steering Digital-to-Analog Converter Based on Thermometer Code

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Embodiment Construction

[0021] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.

[0022] In addition, the term "and / or" in this article is only an association relationship describing associated objects, which means that there may be three relationships, for example, A and / or B, which may mean: A exists alone, A and B exist at the same time, There are three cases of B alone. In addition, the character " / " in this article generally indicates that the contextual objects are an "or" relationship.

[0023] Such as figure 1 As sho...

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Abstract

The present invention relates to the technical field of integrated circuits, and discloses a current steering digital-to-analog converter based on a thermometer code. The digital-to-analog converter includes a decoding circuit, a current source module, a comparator module, a load resistance module, and a feedback resistance module. One end of the decoding circuit is connected to the digital input signal, the other end of the decoding circuit is connected to one end of the current source module, the other end of the current source module is connected to the reverse input end of the comparator module, and the output end of the comparator module is connected to the feedback One end of the resistance module is connected, the other end of the feedback resistance module is respectively connected with the reverse input end of the comparator module and one end of the load resistance module, and the decoding circuit converts the digital input signal of the binary code into the digital control signal of the thermometer code. The digital-to-analog converter converts the traditional array of current sources whose current values ​​are binary multiples into a current source with a single current value, so that the current mismatch is relatively small, thereby effectively improving the conversion accuracy of the digital-to-analog converter.

Description

technical field [0001] The invention belongs to the technical field of integrated circuits, in particular to a thermometer code-based current steering digital-to-analog converter. Background technique [0002] A digital-to-analog converter (Digital to Analog Converter, DAC for short) is a signal converter capable of converting a digital signal into an analog signal, and is widely used in various fields requiring signal processing. There are many types of digital-to-analog converters, among which the current steering digital-to-analog converter (Current Steering Digital to Analog Converter) is a commonly used digital-to-analog converter structure, which has the advantages of high matching accuracy and fast response speed. It is widely used in circuits with high matching requirements, and the energy utilization rate of the current steering digital-to-analog converter is high, and almost all the energy can be output when the output signal is differentially utilized. [0003] H...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H03M1/08
CPCH03M1/0809H03M1/0845
Inventor 董蕾
Owner SOUTHEAST UNIV