A simple CMOS bandgap reference circuit with sub-1-V operation

A new circuit topology for bandgap reference voltage sources is proposed. The circuit works with current summation, has simple design characteristics, supports low voltage power supplies, and provides satisfactory stability, power consumption, and area. A 0.51 V reference source is designed in a 0.35-μm CMOS technology and simulated. Simulation results have shown that the circuit attains a temperature coefficient lower than 24 ppm/°C and a current consumption lower than 6.2 μA. Minimum power supply voltage is 1.0 V, for simulations using NMOS and PMOS VTO (transistor threshold voltage) of 0.50 V and -0.69 V respectively, or 0.8 V, for simulations using NMOS and PMOS VTO of 0.50 V and -0.50 V.