A highly integrated FPGA-based nuclear magnetic resonance spectrometer.

Area of Science:

• Analytical Chemistry
• Spectroscopy
• Electrical Engineering

Background:

• Nuclear Magnetic Resonance (NMR) spectroscopy is a powerful analytical technique.
• Traditional NMR spectrometers are often large, complex, and expensive.
• Integrating digital circuits into a single chip can potentially reduce size and cost.

Purpose of the Study:

• To design and build a compact, homebuilt NMR spectrometer.
• To utilize a Field-Programmable Gate-Array (FPGA) for digital circuit integration.
• To achieve advanced radiofrequency (RF) output capabilities in a portable device.

Main Methods:

• Digital circuits for NMR spectrometer functions (pulse programmer, synthesizer, receiver, PC interface) were implemented on a single FPGA chip.
• The FPGA was combined with peripheral analog components to create a functional spectrometer.
• The system was designed for a radiofrequency (RF) output of up to 400 MHz.

Main Results:

• A compact, laptop-sized NMR spectrometer was successfully developed.
• The device supports amplitude, phase, frequency, and pulse modulation.
• The radiofrequency (RF) channel count is extendable to three without increasing the device size.

Conclusions:

• FPGA technology enables the creation of compact and versatile NMR spectrometers.
• Homebuilt NMR systems can achieve sophisticated RF output and modulation capabilities.
• This development offers a more accessible and portable NMR solution.