An FPGA-Oriented FFT Algorithm for Sigma-Delta Signals

Miranda, Igor; Lima, Carla Caroline Valença de

doi:10.1007/s00034-019-01265-0

Cited by 3 publications

(1 citation statement)

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“…Thirdly, the communication between the modulator and the decimator only needs three wires in case of single-bit modulation; hence, it allows for an easy introduction of isolation barriers or power-domain translation. Digital signal processing can be performed directly on the high-speed bitstream-output signal of the ΔΣ modulator-by means of circuits implemented on FPGAs [9,10]. However, these components are not as common as MCUs, which are readily available in almost every application where some kind of digital control is needed.…”

Section: Introductionmentioning

confidence: 99%

Decimation of Delta-Sigma-Modulated Signals Using a Low-Cost Microcontroller

Fishta

Fiori

2021

Circuits Syst Signal Process

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Abstract$$\varDelta \varSigma $$ Δ Σ analog-to-digital converters (ADCs) are largely used in sensor acquisition applications. In the last few years, standalone $$\varDelta \varSigma $$ Δ Σ modulators have become increasingly available as off-the-shelf parts. To build a complete ADC, a standalone modulator has to be paired with some advanced elaboration unit, such as a field programmable gate array (FPGA) or a digital signal processor (DSP), which is needed for the implementation of the decimation filter. This work investigates the use of low-cost, general-purpose microcontrollers for the decimation of $$\varDelta \varSigma $$ Δ Σ -modulated signals. The main challenge is given by the clock frequency of the modulator, which can be in the range of a few $$\hbox {MHz}$$ MHz . The proposed technique deals with this limitation by employing two serial peripheral interface (SPI) modules in a time-interleaved configuration. This approach allows for continuous acquisition and elaboration of relatively high-speed, digital signals. The technique has been applied to a case study, and a data conversion system has been practically realized. The performance of the proposed filter is compared to that of a digital filter, present on board a commercial microcontroller, and the results of experimental tests are provided.

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Section: Introductionmentioning

confidence: 99%