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本文设计一种新型的全差分电荷泵,采用差分输入和差分输出。采用差分输出不但能够降低电荷泄漏所带来的电压噪声,而且能够提高电荷泵的上升和下降速度。上拉泵电路和下拉泵电路完全对称,能够消除电流失配所带来的噪声,并采用正反馈电路结构,以提高开启和关断速度,并降低功耗。电路在0.18μm工艺,BSIM 3V 3模型下,采用Cadence中的Spectre仿真工具进行仿真,当电源电压VDD=1.8V,f=100MH z时,电路输出的电压范围是0V~1.8V,功耗为0.01mW。
This article designs a new type of fully differential charge pump, using differential input and differential output. Using differential outputs not only reduces the voltage noise caused by charge leakage, but also increases the rate of rise and fall of the charge pump. The pullup pump and pulldown pump circuits are fully symmetrical, eliminating the noise associated with current mismatch and using a positive feedback circuit structure to increase turn-on and turn-off speed and reduce power consumption. Under the 0.18μm process and BSIM 3V 3 model, the circuit is simulated by Spectre simulation tool in Cadence. When the supply voltage VDD = 1.8V, f = 100MH z, the circuit output voltage range is 0V ~ 1.8V, the power consumption is 0.01mW.