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A current comparator and comparison method for correction of current steering digital-to-analog converter

A current comparator, analog converter technology, applied in analog/digital conversion calibration/test, analog/digital conversion, code conversion and other directions, can solve problems such as current mismatch, achieve the effect of simple circuit and accurate comparison results

Active Publication Date: 2021-10-26
UNIV OF ELECTRONICS SCI & TECH OF CHINA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] However, current steering DACs (such as figure 1 The main dynamic parameters (SFDR / SNDR) and linearity (DNL / INL) that characterize accuracy and linearity (shown) are greatly affected by current mismatch

Method used

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  • A current comparator and comparison method for correction of current steering digital-to-analog converter
  • A current comparator and comparison method for correction of current steering digital-to-analog converter
  • A current comparator and comparison method for correction of current steering digital-to-analog converter

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Embodiment Construction

[0018] The present invention is characterized in that the difference of the current signal is converted into the difference of the voltage signal, taking 4 current sources that need to be compared as an example, which contains:

[0019] Reference current source I ref , the first current source I 1 , the second current source I 2 , the third current source I 3 , the fourth current source I 4 , the first switch K 0 , the second switch K 1 , the third switch K 2 , the fourth switch K 3 , the fifth switch K 4 , resistor R, capacitor C and voltage comparator;

[0020] Reference current source I ref The positive pole is connected to the voltage source, the negative pole is connected to the left plate of the capacitor C; the current source I 1 The negative pole is grounded, and the positive pole is connected to the switch K 1 One end of the switch K 1 The other end of the capacitor C is connected to the left plate; the current source I 2 The negative pole is grounded, an...

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Abstract

The invention discloses a current comparator and a comparison method for correcting a current steering digital-to-analog converter, which are applied to a high-speed and high-precision current steering analog-to-digital converter, and relate to a current comparison method. The current comparison of the current steering DAC is realized through a set of additional resistors and capacitors, without a separate current comparator, making the circuit simpler and the comparison result more accurate.

Description

technical field [0001] The invention is applied to a high-speed and high-precision current steering analog-to-digital converter, and relates to a current comparison method. Background technique [0002] In many systems such as wireless communication, signal synthesis, radar, etc., the digital-to-analog converter (Digital-to-Analog, DAC) plays an increasingly important role as a bridge connecting the digital domain to the analog domain, and has also become the limiter of system performance. One of the modules. The current steering structure DAC is very suitable for designing high-speed and high-precision DAC because its signal bandwidth is only affected by the resistance and capacitance of the output node, and is widely used in DAC systems. However, the performance of DAC with current steering structure is greatly limited by non-ideal factors. Especially with the development of DAC towards high precision, high sampling rate and high signal bandwidth, these non-ideal factors...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H03M1/10
CPCH03M1/1009
Inventor 樊华刘杨冯全源叶星宁李大刚胡达千岑远军苏华英
Owner UNIV OF ELECTRONICS SCI & TECH OF CHINA
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