A new wideband modeling technique for spiral inductors

This paper presents a new modeling technique to exactly describe the time-domain (TD) responses of microwave spiral inductors, which leads to wideband models. This new method is suitable for modeling the spiral inductors used in switching type microwave circuits such as LC tank voltage-controlled oscillator (VCO) or in filters. The technique was developed based on applying an ultra-short impulse signal with 30ps (pico-second) width to the device. Furthermore, a simplified layer peeling technique (LPT) and a hybrid equivalent circuit model were used in the modeling process. Experiments were conducted to reveal the feasibility of the technique. Results show that the generated models can be used to describe the TD response of spiral inductors with a time-scale down to pico-seconds order. That is, the proposed method is easy to establish good wideband (tens or even hundreds of GHz) spiral inductor models for describing their wideband characteristics.