Parallel Amplifier Circuit With Unequal Capacitors for Low Noise Figure

The patent applies local quality by assigning different capacitance values to different capacitors connected to parallel transistors. Specifically, capacitors connected to transistors with larger effective sizes have smaller capacitance values, while capacitors connected to transistors with smaller effective sizes have larger capacitance values. This localized differentiation allows each capacitor-transistor pair to be optimized independently, achieving noise figure suppression without requiring uniform increases in all capacitor sizes, thereby preventing overall circuit size expansion.

The patent implements parameter changes by varying the capacitance values of different capacitors based on the effective sizes of their associated transistors. Instead of uniformly increasing all capacitor capacitances to reduce inductance, the invention selectively adjusts individual capacitor parameters. This approach achieves the necessary inductance reduction for noise figure suppression while avoiding unnecessary capacitance increases that would drive up component costs and circuit size.