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We have developed a transportable spectroscopic nitrogen isotopic analyzer. The spectrometer is based on dual-modulation Faraday rotation spectroscopy of nitric oxide isotopologues with near shot-noise limited performance and baseline-free operation. Noise analysis indicates minor isotope ((15)NO) detection sensitivity of 0.36 ppbv·Hz(-1/2), corresponding(More)
Measurement of NO and/or its metabolites in the various body compartments has transformed our understanding of biology. The inability of the current NO measurement methods to account for naturally occurring and experimental NO isotopes, however, has prevented the scientific community from fully understating NO metabolism in vivo. Here we present a mid-IR(More)
A 14.025 Gb/s multi-media transceiver employs on-die Rx AC coupling with baseline wander correction and equalizes up to 26 dB insertion loss at 14.025 Gb/s with a linear equalizer, 10-tap DFE, and 4-tap Tx FIR filter in SST driver. The proposed techniques enable direct feedback for 1st-tap ISI cancellation, and positions of four DFE taps to be adapted over(More)
Faraday rotation spectroscopy (FRS) of O(2) is performed at atmospheric conditions using a DFB diode laser and permanent rare-earth magnets. Polarization rotation is detected with a hybrid-FRS detection method that combines the advantages of two conventional approaches: balanced optical-detection and conventional FRS with an optimized analyzer offset angle(More)
Multiheterodyne spectroscopy implemented with semiconductor Fabry-Pérot lasers is a method for broadband (> 20 cm<sup>-1</sup>), high spectral resolution (~1 MHz) and high time resolution (< 1 µs/spectrum) spectroscopy with no moving parts utilizing off-the-shelf laser sources. The laser stabilization approach demonstrated here enables continuous frequency(More)
In this paper, a reconfigurable successive approximation analog-to-digital converter with selectable resolutions ranging from 7 to 10 bits is presented. The circuit is implemented in IBM CMOS 0.13 m technology, and operates with a 0.9 V supply. The simulated effective number of bits (ENOB) ranges from 6.66 to 9.75, while the simulated power consumption(More)
A dual-modulation Faraday rotation spectrometer is employed for isotopic ratiometry of nitric oxide (NO) converted from nitrate/nitrite. Excellent linearity of measured NO to dissolved nitrate is demonstrated. Ratiometry of IAEA-NO-3 standards indicates ~3 % accuracy.
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