Electronic digital logic circuitry – Interface – Current driving
Reexamination Certificate
2008-07-15
2008-07-15
Barnie, Rexford (Department: 2819)
Electronic digital logic circuitry
Interface
Current driving
C326S068000, C327S333000
Reexamination Certificate
active
07400171
ABSTRACT:
In one embodiment, an electronic switch selectively passes an input signal from an input node to an output node based on a switch-control signal. The bulk of at least one transistor in the switch is connected to either the input node or the output node. The switch has two series-connected PMOS transistors connected in parallel with an NMOS transistor. The bulk and source of the first PMOS transistor are connected to the input node, while the bulk and source of the second PMOS transistor are connected to the output node. First and second level shifters ensure that the gates of the first and second PMOS transistors track the voltages at the input and output nodes, respectively. This configuration improves the ability of the switch to receive input voltages outside of the switch's power supply range without adversely affecting operations of the switch.
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Barnie Rexford
Lattice Semiconductor Corporation
Tran Thienvu V
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