Design and Simulation of a Low Voltage Bandgap Reference Circuit in 0.18 µm CMOS technology for the Supply Range of 1.6 to 4.15V

In this article, a low-voltage Bandgap Reference (BGR) circuit in 0.18µm CMOS technology is designed and simulated. The proposed circuit operates within a supply voltage range of 1.6V to 4.15V and maintains reliable functionality over a wide temperature range from − 55℃ to 130℃. The design is tested for three output reference voltages: 0.8V, 1.0V, and 1.3V. The maximum observed temperature coefficient (TC) is 44 ppm/℃, indicating good thermal stability. The circuit leverages the base-emitter voltage of parasitic bipolar junction transistors (BJTs) to establish a stable reference, and it employs PTAT and CTAT components for temperature compensation. A key feature of this design is its self-biasing architecture, which eliminates the need for external bias currents, enhancing integration and reducing power consumption. Simulation results confirm the circuit’s robustness under process, voltage, and temperature (PVT) variations, making it suitable for low-power and portable analog or mixed-signal systems.