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By taking the negative mobility slope of a three-slope piecewise-linear model for velocity vs electric field in n-GaAs as an adjustable parameter, good quantitative agreement has been obtained with the measured small-signal admittance parameters of GaAs negative conductance amplifiers. The calculation yields a negative mobility of about 2500–3000 cm2/V-sec.
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McWhorter et al. (1966) studied this question.
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