Device, system and methods for a temperature compensated current reference

A system comprising:

• an analog peripheral circuit, the analog peripheral circuit to receive a temperature-compensated current reference;
• an apparatus to generate the temperature-compensated current reference, the apparatus comprising:
• a current mirror circuit to receive a supply voltage and to output a first current reference and a second current reference;
• a cascode circuit to receive as input the first current reference and the second current reference and to output a first cascode output and a second cascode output;
• and
• a current generator circuit to receive as input the first cascode output and the second cascode output, a first output of the current generator circuit to be provided to a ground node, a second output of the current generator circuit to be provided to a first impedance, the first impedance to generate a proportional-to-absolute-temperature current and the second cascode output to be provided to a second impedance, the second impedance to generate a complementary-to-absolute-temperature current, the current generator circuit to be biased at a specific inversion coefficient to generate a second-order temperature compensation of the first current reference and the second current reference.

A method comprising:

• selecting a value of a first impedance,
• setting a value of a second impedance based on the value of the first impedance and a temperature profile of a current flowing through the first impedance;
• varying, ratiometrically, the values of the first impedance and the second impedance to generate a desired current value and to generate a current reference,
• comparing a first-order temperature coefficient of the current reference with a target value,
• readjusting the value of the second impedance based on the first-order temperature coefficient being outside the target value,
• computing a second-order temperature coefficient based on the first-order temperature coefficient being within the target value,
• and modifying the inversion coefficient of a device in a current generator circuit based on the second-order temperature coefficient, to generate a second-order temperature-compensated current reference.