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High-precision band-limited signal digital-to-analog converter and using method thereof

A digital-to-analog converter and digital-to-analog conversion module technology, applied in the direction of digital-to-analog converters, etc., can solve the problems of unoptimized performance and high filter accuracy, improve stability and accuracy, reduce temperature drift, order high effect

Inactive Publication Date: 2012-04-11
CSIC WUHAN LINCOM ELECTRONICS
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  • Abstract
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Problems solved by technology

Because the analog filter is affected by many aspects such as hardware cost, PCB (printed circuit board) board width, temperature drift, component precision, etc., it can only be balanced between performance and other factors, and the precision of the filter cannot be made very high , the performance is often not optimal

Method used

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  • High-precision band-limited signal digital-to-analog converter and using method thereof
  • High-precision band-limited signal digital-to-analog converter and using method thereof
  • High-precision band-limited signal digital-to-analog converter and using method thereof

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Embodiment Construction

[0027] The hardware platform of this solution is based on FPGA (Field Programmable Logic Gate Array) to realize the equivalent interpolation of digital signals, and use digital filters to filter out unnecessary spectrum images after interpolation, and the final analog anti-image filter only It is used to smooth the steep edge of the step. Its main functional modules include: digital signal processor (DSP) external bus interface module, receiving buffer module, digital interpolation module, digital filter module, sending buffer module, DAC interface module, DAC conversion module, analog filter module.

[0028] Among them, the external bus of the digital signal processor (DSP) is connected to the external bus interface module and the receiving buffer module inside the FPGA respectively, the sending buffer module and the DAC interface module inside the FPGA are connected to the external DAC conversion module, and the DAC conversion module is connected to the external DAC conversio...

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Abstract

The invention provides a high-precision band-limited signal digital-to-analog converter and a using method thereof. The convertor comprises a digital signal processor, a field programmable logic gate array, a digital-to-analog conversion module, which are connected successively. The using method comprises the following steps that: firstly, the digital signal processor inputs numeric codes to the field programmable logic gate array; then the field programmable logic gate array improves the sampling rate of the numeric codes through equivalent interpolation and digital filtering, filters out mirror of frequency spectrum of the numeric codes, and finally inputs the numeric codes into the digital-to- analog conversion module for conversion into simulating signals. The high-precision band-limited signal digital-to-analog converter provided by the invention can effectively simplify the design of a mirror-resistant filter and improve the precision of output signals and has relatively strong generality.

Description

technical field [0001] The invention relates to the field of analog and digital signal processing, in particular to a high-precision digital-to-analog converter (DAC) generation method for band-limited signals. Background technique [0002] The digital-to-analog conversion device (DAC) is the interface between the digital signal and the analog signal. The DAC converts the input digital code into an analog level, and then outputs it through the zero-order hold circuit. Since the zero-order hold signal is in a ladder shape, the ladder The steep edge of the signal introduces higher frequency components in the conversion process. According to the Nyquist sampling theorem, these frequency components are called spectral images in the sampling process, and spectral images appear at multiples of the sampling frequency. Therefore, a low-pass filter must be introduced after the zero-order hold circuit. From the perspective of the frequency domain, the low-pass filter filters out unwan...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H03M1/66
Inventor 许霄龙袁浩危峰任全利袁松
Owner CSIC WUHAN LINCOM ELECTRONICS
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