Comment on "On the speed and noise performance of direct ion-implanted GaAs MESFET's" [with reply]

Moll comments on the original paper (see ibid., vol.40, pp. 9-17, 1993), stating that the large values of /spl nu//sub Feng/ are an artifact of an incorrect analysis and do not represent any physical velocity in the transistor. Most probably, a careful analysis of data for their typical transistors would lead to the notion that the electron velocity is on the order of 1.6 10/sup 7/ cm/s at the drain end of the gated channel. In reply, Feng and Laskar probe the current issues regarding these equations and seek to clarify and validate the equations with 1) The question of velocity overshoot or enhancement in the GaAs channel of HEMT's and MESFET's and its impact upon high speed operation and 2) The delay time analysis technique applied to average velocity extraction.<
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