Voltage reference circuit

A method, comprising:

• generating, by an output circuit, an output current using a control signal;
• generating, by the output circuit, a bias signal using the control signal;
• generating, by a divider circuit using the output current, a feedback voltage and a reference voltage;
• and
• generating, by a differential amplifier circuit that includes a first transistor and a second transistor manufactured according to a particular manufacturing process having a plurality of available threshold voltages, the first transistor having a first threshold voltage of the plurality of threshold voltages and the second transistor having a second, different threshold voltage of the plurality of threshold voltages, the control signal using the feedback voltage, the bias signal, and a difference between the first threshold voltage and the second threshold voltage.

An apparatus, comprising:

• a computer system that includes:
• a functional circuit block coupled to a reference node;
• and
• a voltage reference circuit that includes a first transistor with a first threshold voltage and a second transistor with a second threshold voltage different than the first threshold voltage, wherein the voltage reference circuit is configured to:
• generate an output current using a control signal;
• generate a bias signal using the control signal;
• generate, using the output current, a reference voltage on the reference node, and a feedback voltage;
• and
• generate the control signal using the feedback voltage, the bias signal, and a difference between the first threshold voltage and the second threshold voltage.