A programmable CMOS bandgap voltage reference circuit using current conveyor

This paper presents a new structure of a bandgap circuit which can be programmed to get any desired output voltage. Unlike conventional bandgap circuits, the proposed bandgap circuit uses MOS transistors operating in the subthreshold region instead of bipolar transistors to generate PTAT and IPTAT currents. Use of the current conveyor makes the circuit capable of being operated at lower supply voltage. The circuit is capable of generating variable as well as multi voltage references with low dependency on process, voltage and temperature. The proposed architecture was designed in 0.13 μm CMOS technology with 1.5 V power supply and simulations were carried out using SPICE. The total variation in the output voltage is 0.67% over the temperature range of -40-125 deg C.