Voltage-controlled current source with variable supply current

A device for providing electrical current, comprising:

• biasing circuitry providing a biasing current ICC;
• input circuitry including a first voltage input and a second voltage input, the input circuitry operable to receive the biasing current ICC and to divide the biasing current ICC based on the differential voltage measured between the first and second voltage inputs producing first and second biasing currents;
• and
• a pair of translinear circuits operable to receive the first and second biasing currents and responsive thereto produce a first and second output current, the first and second output currents being summed to produce a final output current for the device where the final output current is a minimum of ICC when the differential voltage is approximately zero volts.

A device for providing electrical current, comprising:

• biasing circuitry providing a biasing current ICC;
• input circuitry including a first voltage input and a second voltage input, the input circuitry operable to receive the biasing current ICC and to divide the biasing current ICC based on the differential voltage measured between the first and second voltage inputs producing first and second biasing currents;
• and
• a pair of non-linear circuits operable to receive the first and second biasing currents and responsive thereto produce a first and second output current, the first and second output currents being summed to produce a final output current for the device where the final output current is a minimum of ICC when the differential voltage is approximately zero volts.

A device for providing electrical current powered by a power supply, comprising:

• biasing circuitry providing a biasing current ICC;
• a first half differential transconductance circuit coupled to the biasing circuitry, including a terminal to receive a first input voltage and conducting a current I101, the current I101 depending upon the differential between the first input voltage and a second input voltage;
• a second half differential transconductance circuit coupled to the biasing circuitry, including a terminal to receive the second input voltage and conducting a current I102, the current I102 depending upon the differential between the first input voltage and the second input voltage;
• a first translinear circuit coupled to the first half differential transconductance circuit that receives current I101 and a copy of current 1102, and produces an output current I103 dependent upon the differential between current I101 and current I102;
• a second translinear circuit that receives current 1102 and a copy of current I101, and produces an output current I104 dependent upon the differential between current I102 and current I101;
• and
• wherein output current I103 and output current 1104 combine to produce a final output current.