An ultra-low power voltage reference circuit is presented, which is based on proportional
(PTAT) and complementary (CTAT) to absolute temperature current generation and
performs current-mode voltage reference with first-order temperature compensation. Thanks
to the use of subthreshold CMOS transistors and an operational amplifier, the circuit
achieves low sensitivity to power supply variations while providing low voltage capability.
Measurements show that the proposed circuit provides a reference voltage of around 597 …