Voltage-to-current converter

A differential voltage to current converter having a first and second input regions and having a first and second output regions, said converter comprising:

• first, second, third, fourth, fifth and sixth effective current sources each having first and second terminating regions through which each provides a selected current flow, said first current source first terminating region and said second current source first terminating region each being electrically connected to a first terminal means adapted for electrical connection to a first voltage source, said fifth current source first terminating region being electrically connected to said first output region, said sixth current source first terminating region being electrically connected to said second output region, and each of said second terminating regions of each of said third, fourth, fifth and sixth current sources being electrically connected to a second terminal means adapted for electrical connection to a second voltage source;
• first, second, third and fourth current pass means each having first and second terminating regions between which a conductive path is effectively provided of a selected conductivity, said first current pass first terminating region being electrically connected to said first current source second terminating region, said second current pass means first terminating region being electrically connected to said second current source second terminating region, said third current pass means first terminating region being electrically connected to said second current source second terminating region, said third current pass means second terminating region being electrically connected to said fifth current source first terminating region, said fourth current pass means first terminating region being electrically connected to said first current source second terminating region, and said fourth current pass means second terminating region being electrically connected to said sixth current source first terminating region;
• first and second voltage setting means each having first and second terminating regions and each having a control region therein by which it is capable of being directed to effectively provide a conductive path of a selected conductivity between its first and second terminating regions, said first voltage setting means control region being electrically connected to said first input region, said first voltage setting means first terminating region being electrically connected to said first current pass means second terminating region, said first voltage setting means second terminating region being electrically connected to said third current source first terminating region, said second voltage setting means control region being electrically connected to said second input region, said second voltage setting means first terminating region being electrically connected to said second current pass second terminating region, and said second voltage setting means second terminating region being electrically connected to said fourth current source first terminating region;
• and
• a first current setting means having first and second terminating regions, between which a conductive path is effectively provided of a selected conductivity, said first current setting means first terminating region being electrically connected to said first voltage setting means first terminating region and said first current setting means second terminating region being electrically connected to said second voltage setting means first terminating region.