A cascode model is proposed to analyse current-voltage and cutoff frequency characteristics of the buried-gate device. A high saturation current of the buried-gate device is associated with the short channel FET representing the buried region. Two unsaturated side FETs result in a relatively lower cutoff frequency of the buried-gate device compared to the gate-recessed one.
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http://iet.metastore.ingenta.com/content/journals/10.1049/el_20040169
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