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设计了一种基准电压源电路。在分析传统带隙基准结构的基础上,该电路不采用运放结构,避免了运放失调电压对基准源的影响,并加入内部正、负反馈回路,对基准绝对数值进行补偿。仿真结果表明,当温度在-40℃~140℃之间变化时,该电路输出电压的温度系数小于1.622×10-5/℃,电源抑制比高达98dB,符合设计要求。
A reference voltage source circuit is designed. Based on the analysis of the traditional bandgap reference structure, the circuit does not adopt the op amp structure, which avoids the influence of the op amp offset voltage on the reference source, and adds the internal positive and negative feedback loops to compensate the absolute value of the reference. The simulation results show that the temperature coefficient of the circuit output voltage is less than 1.622 × 10-5 / ℃ and the power supply rejection ratio is as high as 98dB when the temperature varies from -40 ℃ to 140 ℃, which meets the design requirements.