WO2021258949A1 - Convertisseur numérique-analogique à orientation de courant basé sur un codage hybride - Google Patents

Convertisseur numérique-analogique à orientation de courant basé sur un codage hybride Download PDF

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Publication number
WO2021258949A1
WO2021258949A1 PCT/CN2021/095281 CN2021095281W WO2021258949A1 WO 2021258949 A1 WO2021258949 A1 WO 2021258949A1 CN 2021095281 W CN2021095281 W CN 2021095281W WO 2021258949 A1 WO2021258949 A1 WO 2021258949A1
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current
current source
digital
module
analog converter
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PCT/CN2021/095281
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English (en)
Chinese (zh)
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董蕾
王立峰
易真翔
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东南大学
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Publication of WO2021258949A1 publication Critical patent/WO2021258949A1/fr

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    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03M—CODING; DECODING; CODE CONVERSION IN GENERAL
    • H03M1/00—Analogue/digital conversion; Digital/analogue conversion
    • H03M1/66—Digital/analogue converters

Definitions

  • the invention relates to integrated circuit technology, in particular to a current steering type digital-to-analog converter based on hybrid coding, which belongs to the technical field of basic electronic circuits.
  • Digital to Analog Converter is a signal converter that can convert digital signals into analog signals, and is widely used in various fields that require signal processing.
  • digital-to-analog converters There are many types of digital-to-analog converters.
  • 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. And it has a wide range of applications in circuits with higher matching requirements, and the current steering type digital-to-analog converter has a higher energy utilization rate. When the output signal is used differentially, almost all the energy can be output.
  • the conventional current steering digital-to-analog converter uses a current source array whose current value is a binary multiple. Because the current source is limited by the matching accuracy of the resistance value, the resistance value is not exactly the same due to reasons such as process and photolithography. At this time, there is inevitably a mismatch, which directly affects the accuracy of the digital-to-analog conversion. The accuracy that the digital-to-analog converter can achieve depends to a certain extent on the mismatch error of the current source. Therefore, how to reduce the current mismatch of the current source array and thereby improve the conversion accuracy of the digital-to-analog converter is an urgent technical problem to be solved.
  • the purpose of the present invention is to address the shortcomings of the above-mentioned background technology and provide a current-steering digital-to-analog converter based on hybrid coding, which converts the digital input signal of the binary code into the high-order part of the thermometer code and the low-order part by introducing a decoding circuit
  • the binary code mixed coded digital control signal converts the traditional current value into a binary multiple relationship current source array into a current source with the same current value, and uses the mixed coded digital signal of the high part of the thermometer code and the low part of the binary code for control.
  • the resistance value and current value in the source array are both a single value, making the current mismatch of the current source array relatively small, thereby effectively improving the conversion accuracy of the current steering type digital-to-analog converter, and solving how to reduce the current steering type digital-to-analog converter The technical problem of the current mismatch of the current source array.
  • a current steering digital-to-analog converter based on hybrid coding including:
  • Decoding circuit whose input terminal is connected with a binary digital signal of n+m bits, and converts the digital input signal of the lower part of the n-bit binary code into the digital control signal of the n-bit binary code of K0, K1 ⁇ Kn-1.
  • the code circuit converts the digital input signal of the high-order m-bit binary code into the digital control signal of the 2 ⁇ m-1 digit thermometer code of S1, S2 ⁇ S2 ⁇ m-1, and the n and m bits are natural numbers greater than or equal to 1, ;
  • the current source module includes a current source array whose output current value is I and controlled by the low-order part of the binary code, and the current source array whose output current value is 2I and is controlled by the high-order part of the thermometer code, and the output current value is I.
  • An R-2R network is connected between the output terminal of the source array and the ground, and the output terminals of the two power arrays are connected in parallel as the output terminal of the current source module;
  • Comparator module whose non-inverting input terminal is connected to the reference voltage, and its inverting input terminal is connected to one end of the load resistance module and the output terminal of the current source module to output an analog voltage signal;
  • Load resistance module the other end of which is grounded together with the current source module;
  • the feedback resistance module is connected between the inverting input terminal and the output terminal of the comparator module.
  • the current source array whose output current value is I and controlled by the low-order part of the binary code includes: n current source branches with current value I, each current source branch is connected in series with a switch tube, and each switch tube receives Controlled by the one-bit code of the low-order part of the binary code, the R-2R network includes n-1 first resistors and n-2 second resistors.
  • the current source array with an output current value of 2I and controlled by a high-level thermometer code includes 2 ⁇ m-1 current source branches with a current value of 2I, and each current source branch is connected in series with a switch tube, each The switch tube is controlled by the one-bit code of the upper part of the thermometer code.
  • the comparator module includes a comparator based on an operational amplifier, and the non-inverting input terminal of the comparator is connected to the reference voltage Vref.
  • the feedback resistance module includes a feedback resistance Rf, one end of the feedback resistance Rf is connected to the inverting input end of the comparator module, and the other end of the feedback resistance Rf is connected to the output end of the comparator module.
  • the load resistance module includes a load resistance R1, one end of the load resistance R1 is connected to the inverting input terminal of the comparator module, and the other end of the load resistance R1 is grounded.
  • the present invention adopts the above technical solution and has the following beneficial effects:
  • the present invention proposes a current-steering digital-to-analog converter based on hybrid coding, which converts the digital input signal of the binary code into the high-order part of the thermometer code and the low-order part through the decoding circuit
  • the binary code mixed coded digital control signal converts the traditional current source array with the binary multiple relationship into a current source with the same current value, and uses the mixed coded digital signal to control, due to the resistance value and current in the current source array
  • the values are all single values, so the current mismatch of the current source array is relatively small, thereby effectively improving the conversion accuracy of the current steering type digital-to-analog converter.
  • Fig. 1 is a circuit structure diagram of a current steering digital-to-analog converter based on hybrid coding proposed by the present invention.
  • Fig. 2 is a schematic diagram of a decoding circuit involved in an embodiment of the present invention.
  • Fig. 3 is a circuit schematic diagram of a current steering digital-to-analog converter based on hybrid coding proposed by an embodiment of the present invention.
  • a current steering digital-to-analog converter based on hybrid coding includes a decoding circuit, a current source module, a comparator module, a load resistance module and a feedback resistance module, and the input of the decoding circuit
  • the terminal is connected to the digital input signal
  • the output terminal of the decoding circuit is connected to the input terminal of the current source module
  • the output terminal of the current source module is connected to the inverting input terminal of the comparator module
  • the non-inverting input terminal of the comparator module is connected to the reference voltage Vref
  • the output terminal of the comparator module is connected to one end of the feedback resistance module
  • the other end of the feedback resistance module is connected to the inverting input terminal of the comparator module and the load resistance module.
  • the decoding circuit converts the digital input signal of the binary code into high bits.
  • the mixed coded digital control signal of part thermometer code and low-order part binary code are natural numbers greater than or equal to 1.
  • the decoding circuit converts the lower part of the n-bit binary code digital input signal of the n+m-bit binary code digital input signal into the n-bit binary code of K0, K1...Kn-1
  • the digital control signal converts the high-order m-bit binary code digital input signal into S1, S2 ⁇ S2 ⁇ m-1 2 ⁇ m-1 bit thermometer code digital control signal.
  • the current source module includes a current source array.
  • the current source array includes n current sources Ii with the same current value as I. Each current source Ii is connected to one end of a corresponding switch Ki, and i is 0 to n. A natural number of -1; the current source array also includes j current sources Ij with the same current value of 2I, each current source Ij is connected to a section of the corresponding switch Sj, and j is a natural number from 1 to 2 ⁇ m-1.
  • the current source array also includes a R-2R resistor network.
  • the resistor network includes m first resistors Ram and p second resistors Rbp. The first end of the first resistor Ram is connected to the other end of the corresponding switch Ki.
  • the second end of the resistor Ram is connected and grounded in sequence, the second resistor Rbp is located between the first ends of two adjacent first resistors Ram, and the second resistor Rbp is connected in sequence and connected to the inverting input end of the comparator module , 0 ⁇ m ⁇ n-1, 0 ⁇ p ⁇ n-2; the other end of the switch Sj is connected in sequence and connected with the inverting input end of the comparator module.
  • the value is R.
  • the gates of the switch Ki and the switch Sj constitute the input end of the current source module, and the current outflow ends of the switch Ki and the switch Sj constitute the output end of the current source module.
  • the comparator module includes a comparator based on an operational amplifier, including a non-inverting input, an inverting input, and an output.
  • the non-inverting input is connected to the reference voltage Vref, and the inverting input is connected to the current
  • the output end of the source module, one end of the feedback resistance module Rf, and one end of the load resistance module R1 are connected, and the output end outputs a corresponding voltage Vout.
  • the other end of the load resistor R1 is grounded.
  • the resistance value of the load resistor R1 is R, and the specific value of R needs to be specifically set according to actual conditions, which is only used as an identification here.
  • the resistance value of the load resistor Rf is R, and the specific value of R needs to be specifically set according to the actual situation, which is only used as an identification here.
  • the above-mentioned current-steering digital-to-analog converter based on mixed coding introduces a decoding circuit to convert the digital input signal of the binary code into a high-order part of the thermometer code and the low-order part of the binary code to mix-encode a digital control signal, and convert the traditional current value into a binary multiple
  • the current source array of the relationship is converted into current sources with the same current value, and controlled by the mixed-coded digital signal of the high-order part of the thermometer code and the low-order part of the binary code. Because the resistance value and the current value in the current source array are both a single value, the current source array The current mismatch is relatively small, thereby effectively improving the conversion accuracy of the digital-to-analog converter.
  • the output voltage Vout of the digital-to-analog converter is:
  • Vref Vref
  • I I, R1, and R f

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  • Engineering & Computer Science (AREA)
  • Theoretical Computer Science (AREA)
  • Analogue/Digital Conversion (AREA)

Abstract

Convertisseur numérique-analogique à orientation de courant basé sur un codage hybride, comprenant un circuit de décodage, un module de source de courant, un module de comparateur, un module de résistance de charge et un module de résistance de rétroaction. Le circuit de décodage convertit un signal d'entrée numérique d'un code binaire en un signal de commande numérique de codage hybride formé par un code de thermomètre de partie d'ordre supérieur et un code binaire de partie d'ordre inférieur; le module de source de courant est commandé par le signal de commande numérique de codage hybride; un réseau de sources de courant classique ayant des valeurs de courant dans une relation multiple binaire est converti en sources de courant ayant la même valeur de courant; et une valeur de résistance et la valeur de courant sont toutes deux des valeurs simples, de telle sorte que la désadaptation de courant est relativement petite, ce qui permet d'améliorer efficacement la précision de conversion d'un convertisseur numérique-analogique.
PCT/CN2021/095281 2020-06-22 2021-05-21 Convertisseur numérique-analogique à orientation de courant basé sur un codage hybride WO2021258949A1 (fr)

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CN202010577806.2 2020-06-22
CN202010577806.2A CN111900990A (zh) 2020-06-22 2020-06-22 一种基于混合编码的电流舵型数模转换器

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN114640352A (zh) * 2022-03-28 2022-06-17 电子科技大学 一种基于电流舵和r-2r电阻混合型的dac
CN115021750A (zh) * 2022-07-11 2022-09-06 佛山市蓝箭电子股份有限公司 一种输出速率翻倍的数模转化器及其编码方法

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN111900990A (zh) * 2020-06-22 2020-11-06 东南大学 一种基于混合编码的电流舵型数模转换器
CN112511168A (zh) * 2020-12-07 2021-03-16 电子科技大学 一种基于电流镜的数模转换器
CN112688690A (zh) * 2020-12-24 2021-04-20 西安翔腾微电子科技有限公司 一种带符号位温度计编码的低功耗电流舵dac电路的设计方法
CN115001501B (zh) * 2022-08-04 2022-11-22 杰创智能科技股份有限公司 数模转换器、音频播放器以及波形发生器
TWI837915B (zh) * 2022-11-01 2024-04-01 華邦電子股份有限公司 數位類比轉換器

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US6583744B2 (en) * 2001-06-22 2003-06-24 Texas Instruments Incorporated Correction circuit for beta mismatch between thermometer encoded and R-2R ladder segments of a current steering DAC
US20060092065A1 (en) * 2004-10-29 2006-05-04 Broadcom Corporation Delay equalized z/2z ladder for digital to analog conversion
CN102783033A (zh) * 2009-12-31 2012-11-14 德克萨斯仪器股份有限公司 面积减少的数模转换器
CN104579350A (zh) * 2013-10-09 2015-04-29 亚德诺半导体集团 数字-模拟转换器和运行数字-模拟转换器的方法
CN206164504U (zh) * 2016-09-14 2017-05-10 成都旋极星源信息技术有限公司 一种差分分段电流源数模转换器
WO2018208428A1 (fr) * 2017-05-11 2018-11-15 Qualcomm Incorporated Élimination de courant en mode commun pour convertisseurs numérique-analogique
CN109309498A (zh) * 2018-11-08 2019-02-05 东南大学 一种基于温度计码的电流舵型数模转换器
CN109547026A (zh) * 2018-11-08 2019-03-29 东南大学 一种基于r-2r电阻网络的电流舵型数模转换器
CN111900990A (zh) * 2020-06-22 2020-11-06 东南大学 一种基于混合编码的电流舵型数模转换器

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6583744B2 (en) * 2001-06-22 2003-06-24 Texas Instruments Incorporated Correction circuit for beta mismatch between thermometer encoded and R-2R ladder segments of a current steering DAC
US20060092065A1 (en) * 2004-10-29 2006-05-04 Broadcom Corporation Delay equalized z/2z ladder for digital to analog conversion
CN102783033A (zh) * 2009-12-31 2012-11-14 德克萨斯仪器股份有限公司 面积减少的数模转换器
CN104579350A (zh) * 2013-10-09 2015-04-29 亚德诺半导体集团 数字-模拟转换器和运行数字-模拟转换器的方法
CN206164504U (zh) * 2016-09-14 2017-05-10 成都旋极星源信息技术有限公司 一种差分分段电流源数模转换器
WO2018208428A1 (fr) * 2017-05-11 2018-11-15 Qualcomm Incorporated Élimination de courant en mode commun pour convertisseurs numérique-analogique
CN109309498A (zh) * 2018-11-08 2019-02-05 东南大学 一种基于温度计码的电流舵型数模转换器
CN109547026A (zh) * 2018-11-08 2019-03-29 东南大学 一种基于r-2r电阻网络的电流舵型数模转换器
CN111900990A (zh) * 2020-06-22 2020-11-06 东南大学 一种基于混合编码的电流舵型数模转换器

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN114640352A (zh) * 2022-03-28 2022-06-17 电子科技大学 一种基于电流舵和r-2r电阻混合型的dac
CN114640352B (zh) * 2022-03-28 2023-05-09 电子科技大学 一种基于电流舵和r-2r电阻混合型的dac
CN115021750A (zh) * 2022-07-11 2022-09-06 佛山市蓝箭电子股份有限公司 一种输出速率翻倍的数模转化器及其编码方法
CN115021750B (zh) * 2022-07-11 2023-03-24 佛山市蓝箭电子股份有限公司 一种输出速率翻倍的数模转化器及其编码方法

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