Spiral Inductor With Gradient Coil Geometry For LNA Noise Reduction

The patent applies local quality by varying the pattern width of the coil pattern at different locations. Specifically, the pattern width is configured to be narrower at the inner turns and wider at the outer turns of the spiral coil. This non-uniform width distribution optimizes the balance between inductance and quality factor by reducing eddy current losses in the inner regions while maintaining sufficient inductance through the extended outer regions.

The patent implements local quality by configuring the center-to-center distance between adjacent turns to vary throughout the coil pattern. The distance is designed to be larger at the inner turns and smaller at the outer turns of the spiral configuration. This gradient distribution allows the inductor to achieve high inductance through the closely-spaced outer turns while maintaining high self-resonant frequency by keeping parasitic capacitance low through larger spacing at the inner turns.

The patent applies parameter changes by systematically varying the geometric parameters of the coil pattern, specifically the pattern width and center-to-center distance between turns. These parameters are changed in a controlled gradient manner throughout the spiral coil structure, allowing simultaneous optimization of quality factor and self-resonant frequency. The parameter variations are designed to create a non-uniform current distribution that reduces losses while maintaining manufacturability through standard photolithographic patterning processes.