| Reference is an important module in the integrated circuits and has been widely used in various analog ICs, digital-analog mixed signal ICs and SoCs. With the development of IC industry and manufactural technology of semiconductor, the supply voltages of the chip scale down, but when the supply voltage is down to 1 V or lower the traditional bandgap reference become invalid, thus the design of low supply voltage reference circuits has become more and more popular.The main contents in this thesis include the following three aspects: the study of low supply voltage reference's highest accuracy, the design of low supply voltage reference based on first-order-temperature-compensated and high-order- temperature-compensated.Regarding with the study of low supply voltage reference's highest accuracy, firstly, based on the low power reference's generated theory, the first-order math-model has been established, and then has been simulated in MATLAB with the real design parameters, the highest accuracy in ideal situation is given out, it set a reference used below.The design of first-order-temperature-compensated low voltage reference based on UMC 0.18μm standard CMOS process that use modularized simulation methodology to tell the difference between ideality and reality. After analyzing the simulation results, the thesis provided one of the best design schemes. Final, to avoid the disadvantage of the reference circuit mentioned above, a improved reference circuit bas been designed.The design of high-order-temperature-compensated low voltage reference is started with the high-order-temperature-compensated theory. After analyzing the simulation results, the thesis points out the error that comes from the circuit framework. Final, to avoid the disadvantage of the reference circuit mentioned above, a improved low voltage high-order-temperature-compensated reference circuit based on the low voltage first-order-temperature-compensated reference circuit has been designed. |
PDF Full Text Request