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The vertical transistor, however, does not rely on lithography and etching to define its gate length.
ECONOMIST: Transistors: A tall story | The
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This is bad, because gate length is one of the characteristics that determine a transistor's speed.
ECONOMIST: Transistors: A tall story | The
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Conventional transistors typically have a gate length of 180 billionths of a metre (nanometres).
ECONOMIST: Transistors: A tall story | The
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As a result, variations in the gate length reduce the chip's overall performance.
ECONOMIST: Transistors: A tall story | The
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It is generally believed that it will not be possible to reduce the gate length much below 100 nanometres using current lithographic processes.
ECONOMIST: Transistors: A tall story | The
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The result is that the gate length can be controlled precisely.
ECONOMIST: Transistors: A tall story | The
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Prototypes of the vertical transistor, on the other hand, already have a gate length of 50 nanometres, and it should be possible to make them smaller still.
ECONOMIST: Transistors: A tall story | The
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The shorter gate length, and the fact that the gate length does not vary from transistor to transistor, should help chips that are built using vertical transistors to run faster.
ECONOMIST: Transistors: A tall story | The
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The greater the gate length, the slower the transistor, since electrons passing through the channel in the transistor (which is the same length as the gate) have further to travel.
ECONOMIST: Transistors: A tall story | The
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In particular, the length of the gate may vary from one transistor to the next.
ECONOMIST: Transistors: A tall story | The
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The Golden Gate (1986), a full-length novel in verse, was a tour de force.
CNN: ASIANOW - TIME Asia