宽电源输入范围可调多值基准电压源的设计

【作者】 陈志；

【导师】 于奇；

【作者基本信息】 电子科技大学 ， 微电子学与固体电子学， 2011， 硕士

【摘要】 作为集成电路中的基本电路,基准源有着广泛的应用。基准源具有比芯片外部电源更好的精确度和稳定性,其性能好坏直接关系到整个电路的稳定性。随着集成电路集成度的提高,作为集成电路中基本单元的基准源,其设计也面临着越来越严格的要求。在了解基准源国内外发展状况的基础上,本文对基准源进行了归类比较,进而对带隙基准源的原理和结构进行了分析,尤其是对带隙基准源中的关键电压VBE(BJT发射结电压)作了精确分析,了解了基准源的关键影响因素,在结合线性电压调整器(LDO)相关理论的基础上,完成了宽电源输入范围可调多值基准电压源的电路仿真设计和版图设计。所设计的基准电压源电路主要包括宽电源输入范围的电源电压基准电路和可调多值输出基准电路两个部分。其中,宽电源输入范围的电源电压基准电路采用了电压预调整电路和LDO环路,并考虑过压、欠压保护功能,可调多值输出的高精度基准电路采用独立电流源的架构模式。使用0.6μmBCD工艺库,在Cadence环境下进行仿真,得到性能良好的电压基准源,其中,内部模块的5V电源电压基准在输入电压为7V,温度范围-40℃~125℃内,其精度偏差约为50mV,在输入电压6V~35V范围内,其线性调整率约为5mV/V,基于带隙基准电压的2.5V基准电压,其在温度范围-40℃~125℃内的温度系数为7ppm/℃,基于带隙基准电压的0.2V和0.3V的基准电压的温度系数为3.4ppm/℃,同时整个带隙基准电路的PSRR为106dB。更多还原

【Abstract】 As a basic circuit of the integrated circuit, the reference is widely used. The accuracy and stability of the reference in the chip is better than the external power supply of the chip. The performance of the reference govern the the stability of the whole circuit. While the integration of the integrated circuits is being improved, the reference is also being faced a increasingly stringent design requirements.In this paper, based on the development situation of the reference at home and abroad, references are classified on comparison. The basic structure and principle of bandgap references are focus on. Especially made a accurate analysis on the key voltage of the bandgap reference VBE in order to get the key factor of the design. Meanwhile, based on the theory of LDO, this paper completed the schematic and layout design of a wide range voltage source and adjustable multi-valued voltage reference. The reference includes two main circuits: wide range voltage source reference circuit, witch based on regulator and LDO circuits, with the over-voltage and under-voltage protection; and adjustable multi-value output reference circuit, witch based on Supply Independent Current Source structure.Simulated in Cadence with the 0.6μm BCD process, the 5V voltage reference gets a precision error of 50mV, a linear regulation of less than 5mV/V, within supply input voltage range of 6V~35V, and temperature range of -40℃~ 125℃; the 2.5V voltage reference, witch based on bandgap voltage reference, gets a TC of 7ppm/℃; the 0.2V and 0.3V voltage reference, witch also based on bandgap voltage reference, gets a TC of 3.4ppm/℃, while the PSRR of the bandgap reference circuit reaches 106dB.更多还原