Complementary to absolute temperature (CTAT) voltage generator

A circuit comprising:

• a first circuit branch comprising a first transistor and a first current source, the first transistor comprising a base terminal, an emitter terminal, and a collector terminal;
• wherein the base terminal is connected to the collector terminal, the first current source is coupled to the collector terminal of the first transistor, and the first circuit branch is configured to generate a first complementary to absolute temperature (CTAT) voltage signal at the collector terminal of the first transistor;
• a second circuit branch comprising a second transistor and a second current source, the second transistor comprising a base terminal, an emitter terminal, and a collector terminal;
• wherein the base terminal of the second transistor is connected to the collector terminal of the second transistor, the second current source is coupled to the collector terminal of the second transistor, the second circuit branch is configured to generate a second CTAT voltage signal at the collector terminal of the second transistor, the first and second transistors have substantially the same dimensions, and the first current source is configured to provide twice an amount of current provided by the second current source;
• and
• an integrator circuit comprising an input terminal;
• wherein the input terminal is coupled to at least one of:
• the collector terminal of the first transistor and the collector terminal of the second transistor, and the integrator circuit is configured to generate an output CTAT voltage signal based on a difference between the first CTAT voltage signal and the second CTAT voltage signal.