M.Sc. Tsung-Ching Tsai

Stability check methods are important in power amplifier (PA) design. Pole-zero analysis is a common method. In 2001, simplified probe-like method is proposed for microwave amplifier design. In 2020, such probe has been implemented in commercial RF circuit tool ADS where one can do node analysis. Nevertheless, branch analysis is lacking in the developed probe. Therefore, one of the goals for us is to develop such utility by ourselves.

SiGe PAs are valued in space industry while stability issue is a nightmare. Detailed research ha to be done for comparison of the results from node and branch analyses for common-emitter and cascode PAs. In addition, pole-zero identification has to be made.

Tasks:

-Desgin of transformer-based/direct combined SiGe PAs (schematic level) in Keysight ADS

-Understanding and implementation of node/branch analysis and pole-zero identification

-Comparison of the results

Prerequisite:

Good knowledge in circuit theory, fundamental PA theory

Description: TCT_Pole_zero_identification.pdf