US 5,945,867 A · Switch circuit device

Abstract

A first FET is connected between first and third nodes, a second FET is connected between second and fourth nodes, a third FET is connected between third and fifth nodes and a fourth FET is connected between fourth and fifth nodes. A fifth FET is connected between first and sixth nodes and a sixth FET is connected between second and sixth nodes. The gates of the first, fourth and sixth FETs are connected to a first control terminal and the gates of the second, third and fifth FETs are connected to a second control terminal. A power-supply terminal is connected to the fifth and sixth nodes. The first and second nodes are connected to a common terminal through first and second capacitors, respectively. The fifth and sixth FETs form a pull-up switching circuit. The pull-up switching circuit pulls up the source of an FET in an OFF state to the power-supply voltage and isolates the source of an FET in an ON state from the power-supply voltage.

Claims17

Dependent claims

A switch circuit device that complementarily switches a path between a common terminal and a first terminal and a path between said common terminal and a second terminal to an ON state and an OFF state, comprising:

one or a plurality of first field-effect transistors connected in one stage or in a plurality of stages between a first node connected to said common terminal and said first terminal, and each having a gate electrode receiving a first control voltage, one electrode on the side of said first node and the other electrode on the side of said first terminal;
one or a plurality of second field-effect transistors connected in one stage or in a plurality of stages between a second node connected to said common terminal and said second terminal, and each having a gate electrode receiving a second control voltage complementary to said first control voltage, one electrode on the side of said second node and the other electrode on the side of said second terminal;
and
a switching circuit for applying a given pull-up voltage to one of said first and second nodes that is connected to a field-effect transistor in an OFF state and isolating from said pull-up voltage one of said first and second nodes that is connected to a field-effect transistor in an ON state.

1 more element

Dependencies are inferred from the claim text.

Switch circuit device

Life of this patent

Switch circuit device

Life of this patent

Abstract

Claims17