摘要
A new mixed curvature compensation technique for CMOS voltage reference is presented, which resorts to two sub-references with complementary temperature characteristics. The first sub-reference is the source-gate voltage｜VGS｜p of a PMOS transistor working in the saturated region. The second sub-reference is the weighted sum of gate-source voltages｜VGS｜n of NMOS transistors in the subthreshold region and the difference between two base-emitter voltages △VBE of bipolar junction transistors （BJTs）. The voltage reference implemented utilizing the proposed curvature compensation technique exhibits a low temperature coefficient and occupies a small silicon area. The proposed technique was verified in 0.18 μm standard CMOS process technology. The performance of the circuit has been measured. The measured results show a temperature coefficient as low as 12.7 pprrd /℃ without trimming, over a temperature range from -40 to 120℃, and the current consumption is 50 μA at room temperature. The measured power-supply rejection ratio （PSRR） is -31.2 dB @ 100 kHz. The circuit occupies an area of 0.045 mm2.
A new mixed curvature compensation technique for CMOS voltage reference is presented, which resorts to two sub-references with complementary temperature characteristics. The first sub-reference is the source-gate voltage｜VGS｜p of a PMOS transistor working in the saturated region. The second sub-reference is the weighted sum of gate-source voltages｜VGS｜n of NMOS transistors in the subthreshold region and the difference between two base-emitter voltages △VBE of bipolar junction transistors （BJTs）. The voltage reference implemented utilizing the proposed curvature compensation technique exhibits a low temperature coefficient and occupies a small silicon area. The proposed technique was verified in 0.18 μm standard CMOS process technology. The performance of the circuit has been measured. The measured results show a temperature coefficient as low as 12.7 pprrd /℃ without trimming, over a temperature range from -40 to 120℃, and the current consumption is 50 μA at room temperature. The measured power-supply rejection ratio （PSRR） is -31.2 dB @ 100 kHz. The circuit occupies an area of 0.045 mm2.
基金
Project supported by the National Natural Science Foundation of China(No.61376032)
