A fast-speed transformer matching method with additional capacitors in CMOS process

A fast-speed method of transformer matching based on CMOS technology is introduced in this paper. Two capacitors are placed in the matching circuit for better matching result. S-parameters of the proposed matching circuits are developed and the flowchart of the matching program is presented. All of the parameters of passive components can be calculated quickly under the limitations of particular CMOS process. At last, an example of transformer matching is given and the program takes only 20 ms to figure out a set of matching circuit parameters. An actual transformer has been drew by electromagnetic simulation software and the insertion loss is only 0.86 dB at the operation frequency of 20 GHz, which verifies the feasibility of the method.