FPGA based high precision sinusoidal signal generator

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Abstract

A 24-bit sigma-delta digital-to-analog converter (DAC) is used to produce high precision sinusoidal signals with low total harmonic distortion (usually less than -106 dB) for seismic data acquisition system self-tests. The key problem is to convert the sinusoid to a sigma-delta bit stream to drive the sigma-delta DAC. This paper presents a field-programmable gate array (FPGA) based bit stream generator which is composed of a sinusoidal data memory, an interpolation filter and a sigma-delta modulator. This paper focuses on the design and simulation methods for the interpolation filter and the sigma-delta modulator and the whole system implementation using the DSP Builder in FPGA. Tests show that the bit stream generator can drive a 24-bit sigma-delta DAC to produce a 31.25 Hz, 3.96 V peak-peak voltage sinusoidal signal with -121.0 dB total harmonic distortion and 111.4 dB signal-to-noise ratio, which meets the needs for seismic use. The design is simple, programmable and easy to implement.

Keywords seismic data acquisition sinusoidal signal generator delta-sigma modulator field-programmable gate array (FPGA)

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Issue Date: 15 February 2014

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	Zhuo PENG
	Yan DENG
	Cheng MA
	Jianping XIONG
	Yongli Yin

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Zhuo PENG,Yan DENG,Cheng MA, et al. FPGA based high precision sinusoidal signal generator[J]. Journal of Tsinghua University(Science and Technology), 2014, 54(2): 197-201.

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http://jst.tsinghuajournals.com/EN/ OR http://jst.tsinghuajournals.com/EN/Y2014/V54/I2/197

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