MOSFET transistor switch control
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United States of America Patent
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Jul 21, 1987
Grant Date -
N/A
app pub date -
May 1, 1986
filing date -
May 1, 1986
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
An isolated MOSFET analog switch control circuit is disclosed comprising in combination first and second switching MOSFETs for switching an analog input signal through the control circuit. The MOSFETs have their gates connected together at a gate junction and their sources connected together at a source junction. The control circuit further includes current source apparatus for generating a fixed enhancement voltage referenced to the source voltage of the first and second MOSFETs; and switching apparatus. The switching apparatus has a circuit control isolated from the switching MOSFETs and further has first and second switching terminals, for applying and disconnecting the current source apparatus to the control circuit such that when the current source is applied the switching MOSFETs will be turned on and when the current source is disconnected the switching MOSFETs will be turned off.
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