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Digital-to-analog converter and method for reducing harmonic distorion in digital-to-analog converter

A digital-to-analog conversion and analog output technology, applied in digital-to-analog converters, analog-to-digital conversions, instruments, etc., can solve problems such as signal frequency auxiliary distortion, and achieve the effect of increasing circuit complexity

Inactive Publication Date: 2003-07-16
NOKIA TECHNOLOGLES OY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, with these methods there are still some limited signal frequency-dependent distortions

Method used

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  • Digital-to-analog converter and method for reducing harmonic distorion in digital-to-analog converter
  • Digital-to-analog converter and method for reducing harmonic distorion in digital-to-analog converter
  • Digital-to-analog converter and method for reducing harmonic distorion in digital-to-analog converter

Examples

Experimental program
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Embodiment Construction

[0032] has been described above figure 1 segmented current-steering D / A converters and figure 2 The spectrum of the output signal. figure 1 The 10-bit D / A converter is still the basis for describing embodiments of the present invention.

[0033] Figure 3a and 3b briefly shows the figure 1 The current in the D / A converter guides the first and second switching units. In both units, a current switch circuit is used to guide the S by controlling the differential switch pair S figure 1 One of the current sources of the MSB block is 1.

[0034] figure 1 Each current source 1 of the MSB block is predetermined to output a differential current according to the 6-bit MSB portion of the digital signal to be converted into an analog signal. An example of determining the switching sequence for current source 1 can be found in Figure 4 , where each of the 63 current sources is defined as an element in a matrix of paired columns 1-8 and rows 1-8. exist Figure 4 Each current so...

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Abstract

The invention relates to a digital-to-analog converter. In order to reduce distortion in the output, the converter comprises a first and a second current output, at least two current sources and assigned to each of the current source a current switch circuit. Each current switch circuit comprises means for creating two overlapping complementary control signals out of a signal indicating whether the current source is selected, while in a first group of the current switch circuits the connection of the current source to the current outputs is controlled by one of the control signals respectively, and while in a second group of the current switch circuits the control by the control signals is exchanged, each of the current switch circuits of the second group comprising in addition means for inverting the signal input to the means of creating two overlapping complementary control signals.

Description

technical field [0001] The invention relates to a digital-to-analog converter and a method for reducing harmonic distortion in a digital-to-analog converter. Background technique [0002] Digital-to-analog (D / A) converters are used in various applications that convert digital signals to corresponding analog signals. They are used eg in base stations and radio repeater transmitters. The purity of the analog output signal is often critical to the performance of the application. [0003] In a current-steering D / A converter, the analog output signal is formed by connecting multiple current sources to the current output. In most applications, each current source is steered to one of two current outputs, resulting in a differential output signal current. [0004] figure 1 An example is shown of a segmented current steering 10-bit D / A converter whose 6-bit MSB (most significant bit) block is formed by 63 unweighted current sources 1 and the 4-bit LSB (least significant bit) blo...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H03K17/00H03K17/041H03K17/16H03M1/66H03M1/68H03M1/74
CPCH03K17/162H03M1/745H03K17/04106H03M1/747H03M1/687
Inventor 皮特里·埃洛兰塔
Owner NOKIA TECHNOLOGLES OY