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

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 together. 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.