FPGA based high precision sinusoidal signal generator

Zhuo PENG; Yan DENG; Cheng MA; Jianping XIONG; Yongli Yin

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Journal of Tsinghua University(Science and Technology) ›› 2014, Vol. 54 ›› Issue (2) : 197-201.

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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.

Key words

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

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

References

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