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In this paper, a modified compensated matching method for designing a low-noise broadband microwave amplifier with guaranteed stability is proposed. Compensated matching method is formulated as an optimization problem. A hybrid optimization algorithm based on the combination of the genetic algorithm and conjugate gradients method is used to the design of the low-noise stable broadband RF amplifier. The new hybrid algorithm obtains low-noise figure, gain flatness, stability, and loss factor correlated with each reactive element and matching network accomplishment included. An 8–16 GHz broadband microwave amplifier is designed to verify its application. This paper shows that a hybrid technique improves the accuracy of the design and speeds up the design procedure significantly.

A New Design Approach of Low-Noise Stable Broadband Microwave Amplifier Using Hybrid Optimization Method