Bandgap reference circuit using complementary to absolute temperature (ctat) voltage with uncorrelated threshold-voltage devices

A voltage generating circuit, comprising:

• a first temperature-sensitive device of a first type;
• and
• a second temperature-sensitive device of a second type,
• wherein the first temperature-sensitive device and the second temperature-sensitive device are arranged in a cascode structure,
• wherein an output voltage obtained at an output terminal of the voltage generating circuit is equal to a first voltage across the first temperature-sensitive device plus a second voltage across the second temperature-sensitive device,
• wherein the output voltage monotonically decreases with an absolute temperature of the voltage generating circuit.

A method, comprising:

• arranging a first temperature-sensitive device and a second temperature-sensitive device in a cascode structure to form a first voltage source, the first temperature-sensitive device differing from the second temperature-sensitive device in type or threshold voltage;
• generating a first voltage by the first voltage source, the first voltage being complementary to an absolute temperature of the first voltage source;
• generating a second voltage by a second voltage source, the second voltage being proportional to the absolute temperature;
• and
• generating a reference voltage by compensating the first voltage with the second voltage.