Switching network control circuit

Claim 2

An electrical switch arrangement comprising a first and second plurality of intersecting coordinate conductors defining a coordinate array of crosspoints, a plurality of crosspoint switch devices associated with said first and second plurality of conductors at respective crosspoints, each of said devices being activatable by concurrent signals in the conductors of said first and second plurality of conductors defining its crosspoint, a first and a second common node for said first and second plurality of conductors, respectively, transistor means having an anode and a cathode connected to said first and second common nodes, respectively, and having a gate electrode adapted to have a control gating signal applied thereto, and circuit means for said control gating signal including a resistor connected between said second common node and a reference potential.

Claim 3

The electrical switch arrangement in accordance with claim 1 wherein said transistor means comprises a PNPN transistor.

Claim 4

The electrical switch arrangement in accordance with claim 1 wherein said circuit means further includes a control current source connected to said gating electrode.

Claim 5

The electrical switch arrangement in accordance with claim 3 wherein said reference potential is ground potential.

Claim 6

The electrical switch arrangement in accordance with claim 1 wherein a unilateral conductive element is connected in each of the conductors of said first plurality of conductors.

Claim 7

The electrical switch arrangement in accordance with claim 3 wherein the resistance value of said resistor is large compared with the impedance of any one of the conductors connected to said second common node.

Claim 8

In a communication system switching network having a plurality of coordinate crosspoint switches and a plurality of transistor circuits for selectively defining coordinate conducting paths through said switches, each transistor circuit including an anode terminal, a cathode terminal, and a control terminal, a signal source connected to said anode terminal through a first selected coordinate conducting path, a load circuit for said signal connected to said cathode terminal comprising a second selected coordinate conducting path, means for selectively applying a control signal to said control terminal, and a resistor connected between said cathode terminal and ground potential to provide a conducting path for said control signal.

Claim 9

In a communication system switching network having a plurality of coordinate crosspoint switches and a plurality of transistor circuits for selectively defining coordinate conducting paths through said switches, each transistor circuit including an anode terminal, a cathode terminal, and a control terminal, a signal source connected to said anode terminal through a first selected coordinate conducting path, a load circuit for said signal connected to said cathode terminal comprising a second selected coordinate conducting path, means for selectively applying a control signal to said control terminal, and a resistor connected between said cathode terminal and ground potential to provide a conducting path for said control signal.

Claim 10

The combination in accordance with claim 7 wherein the resistance value of said resistor is large compared with the impedance of said load circuit.

Claim 11

In combination, a transistor gate circuit comprising an anode terminal, a cathode terminal and a control terminal; a signal source connected to said anode terminal, a load circuit for circuits from said signal source connected to said cathode terminal; means for applying a control signal to said control terminal; and a resistor connected between said cathode terminal and a reference potential to provide a conducting path for said control signal.

Claim 12

In combination, a transistor gate circuit comprising an anode terminal, a cathode terminal and a control terminal; a signal source connected to said anode terminal, a load circuit for circuits from said signal source connected to said cathode terminal; means for applying a control signal to said control terminal; and a resistor connected between said cathode terminal and a reference potential to provide a conducting path for said control signal.

Claim 13

The combination in accordance with claim 9 wherein said transistor gate circuit comprises a PNPN transistor.

Claim 14

The combination in accordance with claim 9 wherein said reference potential is ground potential.

Claim 15

The combination in accordance with claim 9 wherein said signal source is connected via a first plurality of conductors to said anode terminal, and said load circuit is connected via a second plurality of conductors to said cathode terminal.

Claim 16

The combination in accordance with claim 9 wherein the resistance value of said resistor is large compared with the impedance of said load circuit.

Claim 17

A switching network comprising a plurality of first stage switches, a plurality of second stage switches, each of said first and second stage switches comprising a first and a second plurality of intersecting coordinate conductors defining a coordinate array of crosspoints, a plurality of crosspoint devices electrically associated respectively with said first and second plurality of conductors at said crosspoints, and transistor means having an anode electrode, a cathode electrode, and a gate electrode, said first plurality of conductors having a common connection at one end with said anode electrode, said second plurality of conductors having a common connection at one end with said cathode electrode, each of the conductors of said second plurality of conductors of each of said first stage switches being individually connected to a conductor of said first plurality of conductors of a particular switch of said second stage switches; means for establishing a single conducting path through said network comprising means for applying a first gating signal to the gating electrode of the transistor means of a selected switch of said first stage switches, and means for applying a second gating signal to the gating electrode of the transistor means of a selected switch of said second stage switches concurrently with said first gating signal; and a conducting path for said first and second gating signals including a resistor connected between the cathode of each of saiD transistor means of each of said first and second stage switches and ground.

Claim 18

A switching network comprising a plurality of first stage switches, a plurality of second stage switches, each of said first and second stage switches comprising a first and a second plurality of intersecting coordinate conductors defining a coordinate array of crosspoints, a plurality of crosspoint devices electrically associated respectively with said first and second plurality of conductors at said crosspoints, and transistor means having an anode electrode, a cathode electrode, and a gate electrode, said first plurality of conductors having a common connection at one end with said anode electrode, said second plurality of conductors having a common connection at one end with said cathode electrode, each of the conductors of said second plurality of conductors of each of said first stage switches being individually connected to a conductor of said first plurality of conductors of a particular switch of said second stage switches; means for establishing a single conducting path through said network comprising means for applying a first gating signal to the gating electrode of the transistor means of a selected switch of said first stage switches, and means for applying a second gating signal to the gating electrode of the transistor means of a selected switch of said second stage switches concurrently with said first gating signal; and a conducting path for said first and second gating signals including a resistor connected between the cathode of each of saiD transistor means of each of said first and second stage switches and ground.

Claim 19

The switching network in accordance with claim 14 wherein each of said crosspoint devices comprises differentially wound ferreed switches.