RF Noise Shielding Method and Modelling for Nanoscale MOSFET

RF noise shielding methods with different coverage areas (Pad and TML shielding) were implemented in two port test structures adopting 100-nm MOSFETs. Noise measurement reveals an effective suppression of NF_min but increase of NF₅₀, simultaneously from the shielding methods. The suppression of NF_min is contributed from the reduction of Re(Y_opt) while the noise resistance R_n is kept nearly the same. A lossy substrate model developed in our original work for a standard structure without shielding can be easily extended based on the layout and topology of the shielding schemes to predict the noise shielding effect and explain the mechanisms. The extended lossy substrate model indicates that the elimination of substrate loss represented by substrate RLC networks is the major mechanism contributing the reduction of NF_min. However, the increase of parasitic capacitance generated from the shielding structures is responsible for the degradation of f_T and NF₅₀. The results provide an important insight and guideline for low noise RF circuit design.