| Summary: | 碩士 === 國立虎尾科技大學 === 電子工程系碩士班 === 106 === In this thesis, three different kinds of CMOS differential output reference voltage circuits have been proposed. The design principle is properly combine the positive temperature-coefficient and negative temperature-coefficient parameters to achieve a zero temperature-coefficient voltage. Both the positive and negative temperature-coefficients are obtained from the characteristics of the BJT and MOSFET biased in weak-inversion region. As compared with the present existed circuits, all the proposed reference voltage circuits do not use any operational amplifier in the design, and also do not need to perform the second order nonlinear compensation to the negative temperature-coefficient generation circuits, therefore they benefit from simpler circuit structure, smaller chip area and lower power consumption.
In addition to the detailed design principle disclosed in this thesis, the proposed circuits have been simulated by HSPICE simulation program with a 0.18μm process parameters. Besides, after the layout of the proposed reference voltage circuits has been finished, all the proposed circuits have been taped-out. The simulation results show that, when the power supply voltage is 1.5V and 2.2V, respectively, the temperature ranges from -20°C to 120°C, the average output voltage of the first proposed circuit is about 734mV, the maximum output voltage variation is 14.39mV, the power dissipation is 0.288mW, the temperature coefficient is about 140ppm/°C. The average output voltage of the second proposed circuit the is about 730mV, the maximum output voltage variation is 30.673mV, the power dissipation is 0.122mW, and the temperature coefficient is about 300ppm/°C. Finally, the average output voltage of the last proposed circuit is about 763mV, the maximum output voltage variation is 29.143mV, the power dissipation is 0.117mW, and the temperature coefficient is about 272.64ppm/°C.
The simulation results are consistent with theoretical analysis, it also confirm the validity of the design principles. The proposed CMOS differential output reference voltage circuits are expected to be used in the design of analog integrated circuits and other practical applications.
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