Oscilloscope - dbsandis/MyUTProject GitHub Wiki
Given your 5 MHz transducer and 3.6 ns resolution (≈277 MSPS sampling rate), we need an ultra-fast ADC and a high-speed data transfer mechanism.
1️⃣ Target Bandwidth: ≥5 MHz
- Requires at least 2x the frequency in sampling rate (Nyquist theorem).
- Recommended ADC sampling: ~277 MSPS (or higher) to maintain precision.
2️⃣ Sampling Rate & Resolution:
- 3.6 ns per sample → Requires an ADC running at 277 MSPS or faster.
- STM32 alone cannot achieve this, so we need an external high-speed ADC + FPGA buffer.
3️⃣ Channels:
- At least 2 independent input channels for comparison and signal correlation.
4️⃣ Real-Time Visualization on Raspberry Pi 5:
- Use SPI/UART for data transfer from STM32.
- Process and display signals on Raspberry Pi 5.
5️⃣ Signal Processing:
- FFT, filtering, and spectrum analysis to analyze ultrasonic waveforms.
- Implemented on Raspberry Pi 5 using Python or C++.
| Component | Recommended Part | Why? |
|---|---|---|
| High-Speed ADC | ADS54J60 (500 MSPS, 14-bit, Dual Channel) | Captures two 5 MHz signals with 3.6 ns resolution. |
| Analog Front-End (AFE) | AD8138 (Differential Amp) | Prepares signals for ADC input. |
| FPGA (For Data Buffering) | Xilinx Artix-7 | Buffers high-speed ADC data before STM32. |
| Microcontroller | STM32H7 (480 MHz, DMA) | Handles control logic and real-time data transfer. |
| Data Transfer to Pi 5 | SPI (50 MHz) / USB / Ethernet | Ensures fast transmission to Raspberry Pi 5. |
| Raspberry Pi 5 | Runs GUI & FFT Processing | Displays real-time waveforms & performs signal analysis. |
✅ Would you like a new block diagram showing the ADC + FPGA + STM32 + Pi 5 architecture?
✅ Do you need help selecting the exact FPGA board for handling high-speed data?
✅ Would you like sample firmware for STM32 to handle ADC communication?
Let me know how you'd like to proceed! 🚀