一种硅基OLED微显示芯片的PMU设计
A Design of PMU for the OLED-on-Silicon Micro-Display Chip
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摘要: 设计了一种集成在硅基OLED微显示芯片上的电源管理单元(PMU).该PMU采用Cuk型DC-DC变换器和LDO相结合的新型结构, 其中Cuk电路采用PWM调制的峰值电流控制模式输出负电压, 同时Cuk电路产生的脉冲电压经过滤波得到直流电压, 该电压通过LDO模块输出正电压.电路的整体设计和仿真在SMIC 0.18 μm 1.8 V/5 V CMOS数模混合工艺下完成, 仿真结果表明, 在2 MHz开关频率和3.3 V标准输入电压条件下, 输出正电压在2~5.5 V范围内可调, 输出负电压在-2~-5.5 V范围内可调, 纹波均小于5 mV.输出正、负电压的线性调整率分别为5 mV/V和20 mV/V, 负载调整率分别为0.04 mV/mA和0.15 mV/mA, 满足PMU的设计指标.Abstract: A power management unit (PMU) is proposed that can be integrated in the OLED-on-Silicon micro-display devices. The PMU uses a new structure that combine a Cuk type DC-DC converter and low drop-out voltage regulator(LDO). The DC-DC converter is used to generate negative voltage output with PWM modulation, meanwhile the LDO generates positive voltage output. The PMU is designed under SMIC 0.18 μm 1.8V/5V CMOS mix-signal process. With the 3.3 V input power voltage, the output voltage has an adjustable positive voltage range of 2~5.5 V along and a negative voltage range of -2~-5.5 V. The simulation results show that the output ripple of voltage is less than 5 mV. The positive and negative voltage output linear regulation is 5 mV/V and 20mV/V. Also, a load regulation of 0.04 mV/mA and 0.15 mV/mA is designed to meet the PMU specification.
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