design of a temperature-compensated voltage reference based on the mosfet threshold voltage
In this paper, the analysis and design of a temperature-compensated reference based on the MOSFET threshold voltage is presented. The circuit, which core is a specific current generator, explores the temperature behaviour of the gate-bulk voltage of an NMOS transistor. The transistor is chosen to operate in a region where a PTAT voltage compensates the CTAT characteristic of the threshold voltage. The design is validated through simulation results in different standard CMOS processes. For a low power 0.18 um CMOS process, the voltage reference is 0.912 V and the current reference is 78.68 nA. The temperature coefficient of the voltage reference is 36 ppm/C, in the range from -20 to 80 C. The line sensitivity is 775 ppm/V for a supply voltage range of 1.1 - 1.8 V, and the power supply rejection ratio (PSRR) is -55 dB at 1 kHz. The power dissipation is 346 nW at room temperature. The chip area is 0.0084 mm2.
cmos low-power low-voltage. compact model analog design voltage-current reference