Microwave Hybrid Integrated Broadband Low-noise Amplifier Design

Microwave broadband low noise amplifier, as an important part for microwave and millimeter-wave communication, radar, electronic countermeasures, microwave measuring instruments, and so on, will directly affect the performance of the entire system.There are mainly five types of structure for broadband amplifiers, included balanced amplifiers, negative-feedback amplifiers, distributed amplifiers, lossy matched amplifiers and actively matched amplifiers. In comparing the characteristics of five different types of structure, negative-feedback circuit is the best choice for the design of 2GHz-6GHz low-noise amplifier. Negative-feedback amplifiers have the advantages of wide bandwidth, flat gain response, good input and output matching, small size and good stability.As a three-dimensional electromagnetic simulator of ADS, momentum is able to generate accurate EM models during simulation. In the design of broadband low-noise amplifier, the thesis uses co-simulation with schematic and momentum based on methods of moments. Physical layout component introduced into schematic environment, the accuracy and efficiency of simulation have been improved, since taking physical effects of the layout component into account.The main contents included in this thesis are as follows:The significance of research on microwave low-noise amplifiers, the development of broadband amplifiers and research trends are depicted. The basic theory of low-noise amplifier and five types of frequently-used structure of broadband low-noise amplifiers are introduced.It is illustrated in detail that the process of 2GHz-6GHz low-noise amplifier using negative-feedback structure. By measurement, the gain of the amplifier is 30.75±1.82dB and input and output VSWR is less than 2.124. Noise figure is less than 3.92dB and output 1dB gain compression point is better than 5.35dBm. At last the measurement result is analyzed and the technique for the improvement of the noise performance and system linearity is proposed, with simulation result presented.