Miscellaneous active electrical nonlinear devices – circuits – and – Gating – Signal transmission integrity or spurious noise override
Patent
1998-07-30
1999-12-21
Callahan, Timothy P.
Miscellaneous active electrical nonlinear devices, circuits, and
Gating
Signal transmission integrity or spurious noise override
327401, 327403, H03K 1716
Patent
active
060054336
ABSTRACT:
When turned on by an input CONTROL signal, a MOSFET transistor switch in accordance with the present invention connects a low impedance voltage source to a moderate to high impedance load. The switch includes a relatively large first MOSFET transistor (Q1), a smaller second MOSFET transistor (Q2), a resistor and a current source. Source terminals of transistors Q1 and Q2 are tied to the voltage source. The load is connected to the drain of Q1 while the current source is connected to the drain of the Q2 and also to the gates of both transistors Q1 and Q2. The resistor links the gates of transistors Q1 and Q2 to the voltage source. When the CONTROL signal is asserted, it turns on the current source, thereby quickly turning transistors Q1 and Q2 on to connect the voltage source to the load. When the control source is de-asserted, the current source turns off. Transistors Q1 and Q2 then turn off at a controlled rate in order to minimize current injection into the load.
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Callahan Timothy P.
Credence Systems Corporation
Luu An T.
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