We propose a new technology and design platform using combined common gate (CG) N/PFET complementary field-effect transistor (CFET) as basic element for CMOS circuit applications. Two CFET unit structures, namely, CG and N-gate (NG), are identified to form base design elements. Through the two units, all circuit logic functions in standard cell library and SRAM can be realized without significant process complication. A multigradient neural network (MNN)-based SPICE compact modeling methodology is developed for these CFET units. As an example, MNN model generation is illustrated for CG with the output matching well with the TCAD data within and beyond the range of model extraction. Circuit simulations are exercised using the MNN models and demonstrated successfully the expected circuit functionalities. As the CFET technology be adopted as mainstream in future, this novel design framework proposed would enable efficient logic design.