Abstract
Based on the negative temperature characteristics of threshold voltage and positive temperature characteristics of a multiple of thermal voltage, adding them with proper weight coefficient A voltage reference circuit was proposed with a zero temperature coefficient (TC). The device consists of pure MOSFET operated in subthreshold region and uses no resistors and bipolar transistors. The triple-branch current reference structure is adopted for independence of supply voltage instead of cascade structure and embedded operational amplifier structure with the merit of chip area and power consumption. Simulation results showed that based on standard CMOS 0.18 um process, the circuit can operate at 0.75 V supply voltage with the output voltage only 563 mV. The TC of the voltage was 17.5 ppm/℃ in a range from −40 ℃–125 ℃. The line sensitivity was 569.5 ppm/V in a supply voltage range of 1.2 V–1.8 V, and the power supply rejection ratio (PSRR) was 66.5 dB at 100 Hz. The power dissipation was only 187.4 nW.
Published Version
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