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Thermometer code digital audio-frequency converter

A thermometer coding, digital-to-analog converter technology, applied in digital-to-analog converter, code conversion, analog-to-digital conversion, etc., can solve the problem of increasing current mismatch, reduce signal distortion, eliminate audio noise, and improve audio quality. Effect

Inactive Publication Date: 2003-11-12
THOMSON LICENSING SA
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AI Technical Summary

Problems solved by technology

[0007] Typically, each current source is enabled for a different amount of time, and the mismatch between the implemented currents has an increasing effect

Method used

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  • Thermometer code digital audio-frequency converter
  • Thermometer code digital audio-frequency converter
  • Thermometer code digital audio-frequency converter

Examples

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Embodiment Construction

[0023] figure 1 A block diagram of the digital-to-analog converter DAC1 is shown. DAC1 has an input terminal 2 for receiving digital signals. The input terminal 2 is connected to the input terminal of a thermal decoder 3 for converting the signal applied at the input terminal 2 into a thermometer encoded signal. The output 4 of the hot decoder 3 is connected to the input of a randomizer 5 .

[0024] The randomness generator 5 has a control module 6 for controlling the internal operation of the randomness generator. The control module 6 has a control input 7 connected to the input 2 .

[0025] The output 8 of the randomizer 5 is connected to a switching module 9 with n current sources 10 . The current source 10 is switchable to convert the signal applied from the output terminal 8 to analog. This corresponds to the operation of a so-called "current-steering" type of digital-to-analog conversion.

[0026] The result of the digital-to-analog conversion is output at the outp...

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Abstract

The invention relates to a method for converting a digital signal an analogue signal and to a digital to analogue converter comprising means for converting a digital signal to a thermometer coded signal, means for randomizing the thermometer coded signal, means for controlling the means for randomizing based on the digital signal and means for converting the randomized signal to analogue.

Description

technical field [0001] The present invention generally relates to the field of digital-to-analog conversion, and in particular to digital-to-analog conversion based on thermometer codes. Background technique [0002] Thermometer code digital-to-analog converters (DACs) are well known in the art. Traditional thermometer-coded DACs are of the so-called current-steering type. For the conversion of an m-bit digital input signal, a conventional digital-to-analog converter of the current-steering type includes n identical current sources, where n=2 m 1. Each current source flows a substantially constant current I. [0003] Each current source is switchable for digital-to-analog conversion. In such a conventional DAC, a signal encoded by a thermometer is used to control the switching of the current source I. For an overview of the various prior art see US Patent No. 6,163,283. [0004] US Patent No. 6,359,467 shows a digital-to-analog converter that converts randomized digit...

Claims

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Application Information

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IPC IPC(8): H03M1/74H03M1/06H03M7/16
CPCH03M3/502H03M1/747H03M1/0665H03M7/165H03M1/66
Inventor 弗里德里克·海兹曼马克西米利安·厄尔巴
Owner THOMSON LICENSING SA
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