Automated Spiral Inductor Design by a Calibrated Pi Network with Manifold Mapping Technique

An automated EM-based method for efficient spiral inductor design is proposed and implemented using Matlab-driven Sonnet em simulator. In the proposed method, a surrogate model is established as a replacement to the computational expensive EM model utilizing a simple circuit model with a one-step multi-point calibration followed by an iterative response correction process. In the design procedure, only one parameter extraction is performed prior to the iterative response correction in which no further parameter extraction is required. A hexdecagon spiral inductor is designed and optimized automatically following the proposed procedure, the algorithm convergent within 4 iterations to satisfy design specifications. A comparison between the fine model and updated surrogate model is also given as a validation to the reliability of the proposed method.