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Related Concept Videos

Double Resonance Techniques: Overview01:12

Double Resonance Techniques: Overview

849
Double resonance techniques in Nuclear Magnetic Resonance (NMR) spectroscopy involve the simultaneous application of two different frequencies or radiofrequency pulses to manipulate and observe two distinct nuclear spins. One important application of double resonance is spin decoupling, which selectively suppresses coupling with one type of nucleus while observing the NMR signal from another nucleus, simplifying the spectrum and enhancing resolution.
Spin decoupling is usually achieved by...
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2D NMR: Overview of Homonuclear Correlation Techniques01:16

2D NMR: Overview of Homonuclear Correlation Techniques

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Homonuclear correlation spectroscopy (COSY) is a powerful technique used in Nuclear Magnetic Resonance (NMR) spectroscopy to study the correlations between nuclei of the same type within a molecule. It provides information about scalar couplings between adjacent nuclei, which helps determine connectivity and structural information. There are several COSY variants, each with its unique strengths and experimental parameters.
COSY90 is the standard two-dimensional (2D) COSY experiment that...
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Two-Dimensional (2D) NMR: Overview01:12

Two-Dimensional (2D) NMR: Overview

1.7K
The 1D NMR spectrum of large and complex molecules like natural products has complicated splitting patterns and overlapping signals, which can be easily interpreted using 2-dimensional (2D) NMR. Unlike 1D NMR, 2D NMR has two frequency axes that provide the coupling information between the nucleus A and nucleus B in a molecule. The process from which 2D spectra are obtained has four steps.
The first step is the preparation period, during which nucleus A is excited with a radiofrequency pulse....
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¹H NMR Signal Multiplicity: Splitting Patterns01:13

¹H NMR Signal Multiplicity: Splitting Patterns

8.4K
When protons A and X are coupled, their nuclear spin energy levels are slightly modified. This is because the energy required to excite proton A to a spin state parallel to proton X is slightly different from the energy required for it to become anti-parallel to spin X. Consequently, there are two possible excitation frequencies for A (A1 and A2), depending on the spin state of X, and vice versa. The mutual nature of coupling implies that the difference between frequencies A1 and A2, indicated...
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Interpreting ¹H NMR Signal Splitting: The (n + 1) Rule01:10

Interpreting ¹H NMR Signal Splitting: The (n + 1) Rule

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In the AX proton spin system, proton A can sense the two spin states of a coupled proton X, resulting in a doublet NMR signal with two peaks of equal (1:1) intensity. When proton A is coupled to two equivalent protons (AX2 spin system), the spin states of each X can be aligned with or against the external field, creating three possible scenarios. This results in a 1:2:1  triplet signal, where the central peak corresponds to the chemical shift of A and is twice as large or intense as the...
3.0K
2D NMR: Overview of Heteronuclear Correlation Techniques01:18

2D NMR: Overview of Heteronuclear Correlation Techniques

895
Heteronuclear correlation spectroscopy is an analytical technique that investigates the coupling between different types of nuclei, often a proton and an X-nucleus, such as carbon-13 or nitrogen-15. This method is commonly used in nuclear magnetic resonance (NMR) spectroscopy to gain insights into complex chemical compounds' structural and compositional aspects. A typical heteronuclear correlation spectrum displays X-nucleus chemical shifts on one axis and a proton spectrum on the other...
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Updated: Mar 27, 2026

MRM Microcoil Performance Calibration and Usage Demonstrated on Medicago truncatula Roots at 22 T
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Dual-path NMR receiver using double transceiver microcoils.

Hossein Pourmodheji, Ebrahim Ghafar-Zadeh, Sebastian Magierowski

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    |January 7, 2016
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    Summary
    This summary is machine-generated.

    This study introduces a novel dual-path receiver for Nuclear Magnetic Resonance (NMR) applications, significantly enhancing sensitivity by canceling background signals. The integrated circuit design promises improved performance in NMR systems.

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    Area of Science:

    • Electrical Engineering
    • Biomedical Engineering
    • Physics

    Background:

    • Conventional Nuclear Magnetic Resonance (NMR) systems typically employ a single transceiver coil, which can be limited by background signal interference.
    • Improving the sensitivity and signal-to-noise ratio is crucial for advanced NMR applications and high-resolution imaging.

    Purpose of the Study:

    • To present a fully integrated CMOS dual-path front-end receiver designed to overcome the limitations of conventional NMR systems.
    • To demonstrate the effectiveness of a dual-path receiver architecture in canceling background signals and enhancing NMR sensitivity.

    Main Methods:

    • Design and simulation of a dual-path receiver utilizing two transceiver microcoils.
    • Integration of key components including differential low-noise amplifiers (LNAs), voltage buffers, phase shifters, and variable gain amplifiers (VGAs).
    • Verification of background signal cancellation through spectral simulations for 21 MHz NMR settings.

    Main Results:

    • The dual-path receiver architecture effectively cancels background signals, leading to improved sensitivity.
    • The front-end receiver achieves a low input-referred noise of 2.7 nV/√Hz and a high voltage gain of 80 dB.
    • The compact chip is fabricated using 0.13-μm CMOS technology, occupying an area of 1 mm × 2 mm.

    Conclusions:

    • The developed fully integrated CMOS dual-path front-end receiver offers a significant advancement for NMR applications.
    • The dual-path design provides a robust solution for background signal cancellation, enhancing overall system sensitivity.
    • This technology holds potential for next-generation NMR systems requiring higher performance and miniaturization.