摘要
介绍并设计一款具有高阶曲率补偿功能的开关电容式带隙基准电压源,采用自动调零技术,克服传统线性基准的失调缺陷,消除了失调电压的影响,提高了运放的输出精度。设计采用虚拟管,降低开关管关断时带来的寄生效应;通过架构引入高阶补偿项,使输出电压温度曲线为正弦型,显著降低了温度系数。电路在0.35μm标准CMOS工艺下实现,通过仿真得到在一定温度范围内的温度系数、温度漂移及线性调整率等。所设计电器可作为一种典型的离散时间带隙基准,在以具有高精度为特点的电路中有一定的应用价值。
A switched capacitor bandgap reference voltage source with high- order curvature compen-sation is introduced and designed, which adopts automatic zero adjustment technology to overcome the .offset defect of traditional linear reference, eliminate the influence of offset voltage and improve theoutput accuracy of operational amplifier. The design adopts virtual tube to reduce the parasitic effectwhen the switch tube is turned off. By introducing high -order compensation term, the output voltage -temperature curve is sinusoidal, which significantly reduces the temperature coefficient. The circuit isimplemented in 0.35 μm standard CMOS process, and the temperature coefficient, temperature drift andlinear adjustment rate in a certain temperature range are obtained by simulation. The designed electricalappliance can be used as a typical discrete-time band gap reference, and has certain application value incircuits characterized by high precision.
作者
陆婷
冯喆
LU Ting;FENG Zhe(The 47th Institute of China Electronics Technology Group Corporation,Shenyang 110000,China)
出处
《微处理机》
2021年第1期13-16,共4页
Microprocessors
关键词
带隙基准
自动调零
开关电容
消除失调
高阶补偿
Bandgap reference
Auto-zero
Switched capacitor
Offset cancellation
High order compensation
