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利用电荷泵自举原理,提出一种新颖的CMOS驱动电路。该电路在输入信号未进行开关操作时对电容充电,在开关操作发生时,由电荷泵电容和电源一起向负载电容充放电,从而可在不影响充放电时间的前提下降低电源对负载电容的充放电尖峰电流,减小电源噪声。该电路特别适合用来驱动采用高k介质或深槽隔离工艺的功率集成电路,可同时降低上升/下降沿时间和电源尖峰电流,并大幅减小芯片面积。采用中芯国际0.35μm标准CMOS工艺进行流片,测试结果表明,该电路可同时降低负载电容充放电尖峰电流与上升/下降沿时间。
Using the charge pump bootstrap principle, a novel CMOS driver circuit is proposed. This circuit charges the capacitor when the input signal is not being switched. When the switching operation occurs, the charge-pump capacitor and the power supply charge and discharge to the load capacitor, so that the load on the load capacitor can be reduced without affecting the charge-discharge time Charge and discharge peak current, reduce power noise. This circuit is particularly suitable for driving power ICs using high-k dielectrics or deep trench isolation processes, reducing both rise / fall times and supply spikes and drastically reducing die area. Using SMIC 0.35μm standard CMOS process flow sheet, the test results show that the circuit can simultaneously reduce the load capacitor discharge peak current and rise / fall time.