A Study of Interpulse Instability in Gallium Nitride Power Amplifiers in Multifunction Radars

Tua, Carlos G.; Pratt, T.; Zaghloul, Amir I.

doi:10.1109/tmtt.2016.2604808

Cited by 4 publications

(1 citation statement)

References 58 publications

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“…These thermal transients can have repercussions on device operation and result in poor performance, reduced reliability, and even device failure. For example, gallium nitride power amplifiers used in multifunctional radar systems often suffer from self-heating electrothermal 'memory effects' when switching between different coherent processing intervals, which lead to changes in the amplifier gain and insertion phase that negatively affect device performance [8]. Recent interest in 'embedded cooling' strategies that would embed coolant channels within the device, near the source of heat generation, can exacerbate the effects of transient heating conditions [9].…”

Section: Highlightsmentioning

confidence: 99%

Time-resolved characterization of microchannel flow boiling during transient heating: Part 1 – Dynamic response to a single heat flux pulse

Kingston

Weibel

Garimella

2020

International Journal of Heat and Mass Transfer

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Microchannel flow boiling is an attractive approach for the thermal management of highheat-flux electronic devices that are often operated in transient modes. In Part 1 of this two-part study, the dynamic response of a heated 500 μm channel undergoing flow boiling of HFE-7100 is experimentally investigated for a single heat flux pulse. Three heat flux levels exhibiting highly contrasting flow behavior under constant heating conditions are used: a low heat flux corresponding to single-phase flow (15 kW/m 2), an intermediate heat flux corresponding to continuous flow boiling (75 kW/m 2), and a very high heat flux which exceeds critical heat flux and would cause dryout if applied continuously (150 kW/m 2). Transient testing is conducted by pulsing between these three heat flux levels and varying the pulse duration. High-frequency measurements of heat flux, wall temperature, pressure drop, and mass flux are synchronized to high-speed flow visualizations to characterize the boiling dynamics during the pulses. At the onset of boiling, the dynamic response resembles that of an underdamped mass-spring-damper

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Section: Highlightsmentioning

confidence: 99%

Time-resolved characterization of microchannel flow boiling during transient heating: Part 1 – Dynamic response to a single heat flux pulse

Kingston

Weibel

Garimella

2020

International Journal of Heat and Mass Transfer

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Transient Flow Boiling and Maldistribution Characteristics in Heated Parallel Channels Induced by Flow Regime Oscillations

Kingston

Olson

Weibel

et al. 2021

IEEE Trans. Compon., Packag. Manufact. Technol.

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Phased-Array Radar System Simulator (PASIM): Development and Simulation Result Assessment

Perera

Zhang

et al. 2019

Remote Sensing

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In this paper, a system-specific phased-array radar system simulator was developed, based on a time-domain modeling and simulation method, mainly for system performance evaluation of the future Spectrum-Efficient National Surveillance Radar (SENSR). The goal of the simulation study was to establish a complete data quality prediction method based on specific radar hardware and electronics designs. The distributed weather targets were modeled using a covariance matrix-based method. The data quality analysis was conducted using Next-Generation Radar (NEXRAD) Level-II data as a basis, in which the impact of various pulse compression waveforms and channel electronic instability on weather radar data quality was evaluated. Two typical weather scenarios were employed to assess the simulator’s performance, including a tornado case and a convective precipitation case. Also, modeling of some demonstration systems was evaluated, including a generic weather radar, a planar polarimetric phased-array radar, and a cylindrical polarimetric phased-array radar. Corresponding error statistics were provided to help multifunction phased-array radar (MPAR) designers perform trade-off studies.

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A Study of Interpulse Instability in Gallium Nitride Power Amplifiers in Multifunction Radars

Cited by 4 publications

References 58 publications

Time-resolved characterization of microchannel flow boiling during transient heating: Part 1 – Dynamic response to a single heat flux pulse

Time-resolved characterization of microchannel flow boiling during transient heating: Part 1 – Dynamic response to a single heat flux pulse

Transient Flow Boiling and Maldistribution Characteristics in Heated Parallel Channels Induced by Flow Regime Oscillations

Phased-Array Radar System Simulator (PASIM): Development and Simulation Result Assessment

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