ArticleJournal of magnetic resonance (San Diego, Calif. : 1997)2010
Digital detection and processing of multiple quadrature harmonics for EPR spectroscopy.
Article in Journal of magnetic resonance (San Diego, Calif. : 1997), 2010. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 12 papers.
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Who cites it
12 citing papers in PubMed.
- Dispersion EPR: Considerations for Low-Frequency Experiments.Applied magnetic resonance · 2022Article
- EPR Everywhere.Applied magnetic resonance · 2021Review
- Development of an L-band rapid scan EPR digital console.Journal of magnetic resonance (San Diego, Calif. : 1997) · 2019Article
- Digitally generated excitation and near-baseband quadrature detection of rapid scan EPR signals.Journal of magnetic resonance (San Diego, Calif. : 1997) · 2014Article
- The world as viewed by and with unpaired electrons.Journal of magnetic resonance (San Diego, Calif. : 1997) · 2012Article
- Dual-scan acquisition for accelerated continuous-wave EPR oximetry.Journal of magnetic resonance (San Diego, Calif. : 1997) · 2012Article
- Multisite EPR oximetry from multiple quadrature harmonics.Journal of magnetic resonance (San Diego, Calif. : 1997) · 2012Article
- Digital EPR with an arbitrary waveform generator and direct detection at the carrier frequency.Journal of magnetic resonance (San Diego, Calif. : 1997) · 2011Article
- Use of polyphase continuous excitation based on the Frank sequence in EPR.Journal of magnetic resonance (San Diego, Calif. : 1997) · 2011Article
- Rapid frequency scan EPR.Journal of magnetic resonance (San Diego, Calif. : 1997) · 2011Article
- Optimization of magnetic field sweep and field modulation amplitude for continuous-wave EPR oximetry.Journal of magnetic resonance (San Diego, Calif. : 1997) · 2011Article
- Reconstruction of the first-derivative EPR spectrum from multiple harmonics of the field-modulated continuous wave signal.Journal of magnetic resonance (San Diego, Calif. : 1997) · 2011Article
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6 authors.
Funding
Abstract
A quadrature digital receiver and associated signal estimation procedure are reported for L-band electron paramagnetic resonance (EPR) spectroscopy. The approach provides simultaneous acquisition and joint processing of multiple harmonics in both in-phase and out-of-phase channels. The digital receiver, based on a high-speed dual-channel analog-to-digital converter, allows direct digital down-conversion with heterodyne processing using digital capture of the microwave reference signal. Thus, the receiver avoids noise and nonlinearity associated with analog mixers. Also, the architecture allows for low-Q anti-alias filtering and does not require the sampling frequency to be time-locked to the microwave reference. A noise model applicable for arbitrary contributions of oscillator phase noise is presented, and a corresponding maximum-likelihood estimator of unknown parameters is also reported. The signal processing is applicable for Lorentzian lineshape under nonsaturating conditions. The estimation is carried out using a convergent iterative algorithm capable of jointly processing the in-phase and out-of-phase data in the presence of phase noise and unknown microwave phase. Cramér-Rao bound analysis and simulation results demonstrate a significant reduction in linewidth estimation error using quadrature detection, for both low and high values of phase noise. EPR spectroscopic data are also reported for illustration.
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