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Spectrum Analyzer Signal Conditioning and Processing for Capturing Arc Signatures Reference Design

Texas Instruments

This reference design demonstrates bandwidth-optimized analog front end (AFE) and real-time FIR implementation using low power to capture broadband frequency spectrum in any waveform. An operational amplifier in each signal path is chosen based on the gain: signal bandwidth: low noise and close to the rail swing requirements while consuming low power. The waveform is processed in real-time both in frequency and time domain using a mixed signal ultra-low power microprocessor with a built-in vector math engine.

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Features

AFE for effective passing both low frequency and high frequency while suppressing signal noiseCapturing frequency content up to 100 kHz in frequency domain by sampling the signal using 12-bit SAR ADC at 200 ksps and performing real-time FIR filter in MSP430 using low energy accelerator (LEA) frequency domain by sampling the signal using 12-bit SAR ADC at 200 ksps and performing real-time FIR filter in MSP430 using low energy acceleratorHigh frequency time domain analysis:Capturing arc signatures up to 3MHz using internal comparator of MSP430Noise capture up to 10MHz using external comparatorIQ requirement of 10 mA is derived from single-phase AC supply of 85 Vrms to 270 Vrms with capability of powering up to 100 mACompatible with various sensors like shunt: CT or Rogowski coil