采用自上向下的模块化设计方法，将PDDC的功能划分为基本单元，实现这些功能模块并组成模块库。
Using Top-Down design method, the whole PDDC function is divided to many units implemented respectively and organized to the module library.
在此基础上，本文首次采用弹-粘塑性边界元法并结合锚喷支护考虑了隧洞掘进面时空效应作用问题，从而拓展了边界单元法的工程应用。
Based on the above work a space-time effect on the excavation face of tunnel with the function of bolting support is considered, thus the engineering application of BEM is developed.
为了获得更加稳定的系统，在电荷泵中设计了结构简单的电流单元用于补偿额外的参数变化，并采用线性压控增益的VCO来减小参数的变化。
Furthermore, a simple adjustable current cell in the charge pump is proposed for additional stability compensation and a novel VCO with linear gain is adopted to limit the total variation.
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