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Guiding current symbol digifax converter

A technology of digital-to-analog converter and current guidance, which is applied in the direction of digital-to-analog converter to achieve the effect of improving the working speed

Inactive Publication Date: 2009-02-11
TSINGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to overcome the shortcomings brought by the single-supply current-steering digital-to-analog converter of the traditional structure, and propose a new type of current-steering symbol digital-to-analog converter device. The half-wave sine (cosine) amplitude signal of the second amplitude mapping and the first phase in the sine (cosine) amplitude converter are used as digital amplitude input signals, and the second phase is eliminated without increasing circuit complexity and delay. Sub-amplitude mapping to improve the output signal bandwidth of direct digital frequency synthesizers and other sine (cosine) wave signal synthesis circuits

Method used

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  • Guiding current symbol digifax converter
  • Guiding current symbol digifax converter
  • Guiding current symbol digifax converter

Examples

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Embodiment Construction

[0011] Below is a further description of the present invention in conjunction with the accompanying drawings.

[0012] An embodiment of the current-steering type sign digital-to-analog converter device of the present invention has a structure such as figure 2 As shown, the current-steering type digital-to-analog converter device 200 of this embodiment includes an input bit conversion unit 230, a current-steering type digital-to-analog converter unit 250 and an output load resistor 270; in the figure, 1MSB 220 and half-wave positive The (co)sine wave digital amplitude 221 is connected together to the input of the input bit converter a 231 and the input bit converter b 232 in the input bit conversion unit 230; the digital amplitude a 241 of the output of the input bit converter a 231 is connected to The input terminal of the single-supply current-steering type digital-to-analog converter a 251 in the current-steering type digital-to-analog converter unit 250, the digital amplit...

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Abstract

The invention includes input converting unit comprising two bit converters, current steering D / A converting unit comprising two single power current guided D / A converter, and an output load resistor. The input of input bit converting unit connects to input amplitude signal with M bit length, and the two routes M-1 bit amplitude signal in the output of input bit converting unit separately connects to the input of digital amplitude in two routes single power current guided D / A converter. The current outputs of two routes single power current guided D / A converter is connected together and connects to same end of output load resistor. Another end of output load resistor connects to ground.

Description

technical field [0001] The invention belongs to the technical field of integrated circuit digital-to-analog converter design, in particular to a high-speed current-guided digital-to-analog converter design for direct digital frequency synthesizers and other sine (cosine) wave signal synthesis applications. Background technique [0002] In applications such as direct digital frequency synthesizer and other sine (cos) wave signal synthesis, the digital-to-analog converter converts the synthesized sine (cos) sine digital amplitude signal into an analog amplitude signal, and its structure will directly affect the designed The output signal bandwidth of the system. [0003] In order to reduce the complexity of the circuit, the sine (cosine) phase amplitude conversion circuit used in the direct digital frequency synthesizer and other sine (cosine) wave signal synthesis applications usually adopts the waveform symmetry algorithm, and only synthesizes 0 in one cycle. The magnitude ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H03M1/66
Inventor 陈军杨华中汪蕙
Owner TSINGHUA UNIV
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