SigmaXplore 3
SigmaXplore 3 is a complete learning platform built around an all-discrete 3rd‑order Delta‑Sigma ADC and a differential Delta‑Sigma DAC, designed to make the core principles of Delta‑Sigma technology truly intuitive. The system can be configured as either a 1st‑order or 3rd‑order ADC, with cascading feedback paths that let you explore stability, noise shaping, and dynamic behavior firsthand. In the 3rd‑order mode, optional feedforward paths can be enabled or disabled, allowing you to directly observe how they affect input range, loop stability, and integrator node behavior.
On the digital side, you’ll gain hands‑on experience with essential signal‑processing techniques, including CIC filters, FIR equalization, a Numerically Controlled Oscillator, CORDIC wave generation, and a simple UART interface for streaming data to your PC. All HDL blocks are fully accessible and customizable in Vivado, giving you complete freedom to experiment and modify the architecture. Python scripts are also included to help you process and visualize output data—and can be expanded as your skills grow.
If you’re looking to dive into mixed‑signal and Delta‑Sigma technologies, SigmaXplore 3 is an ideal starting point. All you need is a PMOD‑compatible FPGA board and a PC. No additional test equipment is required, though an oscilloscope can be helpful for deeper exploration.
FEATURES
ADC
- 1st/3rd configuration CIFB continuous time delta sigma ADC
- Single bit or two-bit FIR feedback
- Enable/disable feedforward cancelation
- 2.5MHz to 10MHz sampling rate
- plugs directly into a FPGA PMOD connector
- up to -95dB SNR OSR=128
- 3.3V Single Supply from PMOD
DAC
- Single ended output
- Single ended or differential FPGA interface
- 5th order equivalent analog filtering
- configurable Nth order
- Up to -95dB SFDR and -95dB SNR
APPLICATIONS
- Delta Sigma practical learning for personal, professional, or an educational lab
- Loop through signal analysis. DAC to ADC to PC
- Numerically controlled signal generation
- LAB grade signal generator 92dB SFDR
- High fidelity audio digital signal processing or effects. Complete signal chain analog in/analog out.