Methods and apparatuses including a process, voltage, and temperature independent current generator circuit

A method, comprising:

• providing an output voltage from an amplifier responsive to a voltage differential at inputs of the amplifier;
• coupling, responsive to the output voltage, a voltage source to an output node;
• providing an output current based on the output voltage;
• providing a substantially constant bandgap voltage based on a voltage circuit including a pair of resistors and a diode;
• and
• adjusting the output voltage based on a change in the voltage differential such that the output current responsive, at least on part, to the bandgap voltage remains substantially constant in temperature coefficient based on the voltage circuit including the pair of resistors and the diode.

An apparatus comprising:

• a current generator including:
• a first circuit coupled to a first transistor, wherein the first circuit includes a plurality of resistors and a diode, and the first circuit is configured to provide a bandgap voltage having a value based on the plurality of resistors and the diode to a bias line;
• and
• an amplifier including a non-inverting input coupled to a node between a second transistor and a second circuit, the amplifier further including an inverting input coupled to a node between a third transistor and a third circuit, the amplifier configured to provide an output voltage to the bias line responsive to a voltage differential between the non-inverting input and the inverting input,
• wherein a current through a fourth transistor coupled to an output of the current generator is provided responsive to the output voltage applied to the bias line and remains, based on the plurality of resistors and the diode providing the bandgap voltage, substantially constant in temperature coefficient.