Field-effect tetrode: Difference between revisions
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The '''tetrode field-effect transistor'''<ref>[https://www.jedec.org/standards-documents/dictionary/terms/tetrode-field-effect-transistor Tetrode field-effect transistor], JEDEC definition</ref> or '''field-effect tetrode''' is a [[solid-state electronics|solid-state]] [[semiconductor device]], constructed by creating two [[field effect (semiconductor)|field-effect]] channels back-to-back, with a junction between. It is a four-terminal device |
The '''tetrode field-effect transistor'''<ref>[https://www.jedec.org/standards-documents/dictionary/terms/tetrode-field-effect-transistor Tetrode field-effect transistor], JEDEC definition</ref> or '''field-effect tetrode''' is a [[solid-state electronics|solid-state]] [[semiconductor device]], constructed by creating two [[field effect (semiconductor)|field-effect]] channels back-to-back, with a junction between. It is a four-terminal device which does not have specific gate terminals because each channel is a gate for the other,<ref name="M">{{cite book|title=Integrated Circuits: Design Principles and Fabrication|editor1=Raymond M. Warner Jr.|editor2=James N. Fordemwalt|pages=220–223|date=1965|publisher=McGraw Hill}}</ref> the voltage conditions modulating the current carried by the other channel.<ref>{{cite book|title=Academic Press Dictionary of Science and Technology|url=https://archive.org/details/academicpressdic00morr|url-access=registration|editor=Christopher G. Morris|publisher=Academic Press|isbn=9780122004001|page=[https://archive.org/details/academicpressdic00morr/page/824 824]|date=15 September 1992}}</ref> |
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==Current–voltage relationship== |
==Current–voltage relationship== |
Latest revision as of 15:32, 9 October 2022
The tetrode field-effect transistor[1] or field-effect tetrode is a solid-state semiconductor device, constructed by creating two field-effect channels back-to-back, with a junction between. It is a four-terminal device which does not have specific gate terminals because each channel is a gate for the other,[2] the voltage conditions modulating the current carried by the other channel.[3]
Current–voltage relationship[edit]
Where the voltage on the first channel is and the voltage on the second channel is , the current in the first channel, , and the current in the second channel, , are given by:
and
,
where the are the low-voltage conductance of the channels and is the pinch-off voltage (assumed to be the same for each channel).
Applications[edit]
The field-effect tetrode can be used as a highly linear electronically variable resistor – resistance is not modulated by signal voltage. Signal voltage can exceed bias voltage, pinch-off voltage, and junction breakdown voltage. The limit is dependent on dissipation. Signal current flows in inverse proportion to the channel resistances. The signal does not modulate the depletion layer, so the tetrode can perform at high frequencies. The tuning ratio can be very large – the high resistance limit is in the megohms range for symmetrical pinch-off conditions.[2]
See also[edit]
- Field-effect transistor
- Multigate device, other multi-gate devices
- Tetrode transistor, any transistor having four active terminals
References[edit]
- ^ Tetrode field-effect transistor, JEDEC definition
- ^ a b Raymond M. Warner Jr.; James N. Fordemwalt, eds. (1965). Integrated Circuits: Design Principles and Fabrication. McGraw Hill. pp. 220–223.
- ^ Christopher G. Morris, ed. (15 September 1992). Academic Press Dictionary of Science and Technology. Academic Press. p. 824. ISBN 9780122004001.