Long microwave delay fiber-optic link for radar testing

Newberg, I.L.; Gee, C. M.; Thurmond, G. D.; Yen, H.C.

doi:10.1109/22.54937

Cited by 35 publications

(5 citation statements)

References 2 publications

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“…Small variation of the time delay introduces a nonnegligible shift of the null frequency (shift in the null frequency being proportional to the RF frequency [19]). The small variation of the null frequency can be due, for example, to a small change of temperature or vibration inside the fiber [20]. Temperature control of the long delay-line optic fiber would, therefore, be necessary for these high frequencies.…”

Section: Resultsmentioning

confidence: 99%

All-optical RF filter using amplitude inversion in a semiconductor optical amplifier

Coppinger

Yegnanarayanan

Trinh

et al. 1997

IEEE Trans. Microwave Theory Techn.

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Section: Resultsmentioning

confidence: 99%

All-optical RF filter using amplitude inversion in a semiconductor optical amplifier

Coppinger

Yegnanarayanan

Trinh

et al. 1997

IEEE Trans. Microwave Theory Techn.

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“…The FRI signal generator uses an analog approach, which is known for its low digital noise and ability to accurately simulate real-world applications such as radar and ultrasound [52]. The process of signal production involves several components working together to generate and process a signal.…”

Section: A Fri-tem Analog Boardmentioning

confidence: 99%

Hardware Prototype of a Time-Encoding Sub-Nyquist ADC

Naaman¹,

Glazer²,

Namer³

et al. 2023

Preprint

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Analog-to-digital converters (ADCs) are key components of digital signal processing. Classical samplers in this framework are controlled by a global clock. At high sampling rates, clocks are expensive and power-hungry, thus increasing the cost and energy consumption of ADCs. It is, therefore, desirable to sample using a clock-less ADC at the lowest possible rate. An integrate-and-fire time-encoding machine (IF-TEM) is a timebased power-efficient asynchronous design that is not synced to a global clock. Finite-rate-of-innovation (FRI) signals, ubiquitous in various applications, have fewer degrees of freedom than the signal's Nyquist rate, enabling sub-Nyquist sampling signal models. This work proposes a power-efficient IF-TEM ADC architecture and demonstrates sub-Nyquist sampling and FRI signal recovery. Using an IF-TEM, we implement in hardware the first sub-Nyquist time-based sampler. We offer a feasible approach for accurately estimating the FRI parameters from IF-TEM data. The suggested hardware and reconstruction approach retrieves FRI parameters with an error of up to -25dB while operating at rates approximately 10 times lower than the Nyquist rate, paving the way to low-power ADC architectures.Index Terms-Brain-inspired computing, analog-to-digital conversion (ADC), time-based sampling hardware, integrate and fire TEM (IF-TEM), sub-Nyquist sampling, finite-rate-of innovation (FRI) signals.

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“…compensates only the phase value modulo 2T, therefore the actual delay time t is equal to t=n/zif+tr (1) where L f is the frequency interval, t r is the delay time of the reference path or the electrical delay, and n is an indefinite whole number. If the number of measurement points is 801 for HP 8510B, when the product of delay time and bandwidth is less than 800, n=O.…”

Section: Resolution Of Delay Time Ambiguitymentioning

confidence: 99%

“…2 degrees (peak to peak) . From some papers [1,2,3] , these requirements can be met by using optical fiber delay line.However, there is no detailed description about the measurement of optical fiber delay line.…”

Section: Introductionmentioning

confidence: 98%