Miscellaneous active electrical nonlinear devices – circuits – and – Gating – Signal transmission integrity or spurious noise override
Reexamination Certificate
2005-10-18
2005-10-18
Wells, Kenneth B. (Department: 2816)
Miscellaneous active electrical nonlinear devices, circuits, and
Gating
Signal transmission integrity or spurious noise override
C327S434000, C323S315000
Reexamination Certificate
active
06956426
ABSTRACT:
An integrated high-voltage switching circuit includes a switch having ON and OFF states and having a parasitic gate capacitance. The switch consists of a pair of DMOS transistors integrated back to back and having a shared gate terminal, the drains of the DMOS transistors being connected to the input and output terminals of the switch respectively. The switching circuit further includes a turn-on circuit comprising a PMOS transistor having its drain connected to the shared gate terminal of the switch via a first diode, having its source connected to a global switch gate bias voltage terminal from which the PMOS transistor draws current, and having its gate electrically coupled to a switch gate control terminal that receives a switch gate control voltage input. The switch transitions from the OFF state to the ON state in response to a first transition of the switch gate control voltage input that causes the PMOS transistor to turn on, and the switch remains in the ON state in response to a second transition of the switch gate control voltage input that causes the PMOS transistor to turn off. The DMOS transistors turn on in response to the shared gate being coupled to the switch gate bias voltage when the PMOS transistor turns on.
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Cabou Christian G.
General Electric Company
Testa Jean K.
Wells Kenneth B.
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