【Transistor matching circuit design function】 〜It selects the transistor to be used from the library and designs input and output matching circuit and noise matching circuit only by inputting the specifications.〜 ● ● It can design matching circuits using LC, micro strip, electrical length line, and strip line. ● It can design circuits with Γ, π, one line, two lines (stepped impedance type). ● It can design input and output matching circuit and noise matching circuit simultaneously. ● It can moderate the input and output matching conditions and tighten the noise matching conditions. ● It can select emitter grounding, base grounding, or collector grounding. ● It can design with altered input and output port impedance. ● It can design two types of circuits and can change the combination of input and output afterwards.

【Example of design using πtype matching circuit】 ● ● This is an example of design of a 1.2 GHz amplifier using 2SC4226. ● The matching circuit uses π type. ● The graph shows that it makes a total match at 1.2 GHz. ● π type matching circuit canﾊ be selected from four types of LC combinations. ● The transistor symbol is shown with a square in the circuit because there are both bipolar types and FET type of transistors. Thus, the most general symbol, S parameter box (square) is used. 【Example of design of LNA using Γ type matching circuit (micro strip)】 ● ● This is an example of design of an LNA (low noise amplifier) by Γ type using HEMT and micro strip. ● The reactance is inserted into the source in order to make power matching and noise matching compatible. ● This reactance component is of course automatically inserted by Design. ● The noise figure is almost minimum at 5.6 GHz. ● The input and output matching conditions can be loosened and noise matching conditions can be tightened. Top of the Page Copyright(C) 2000 MEL Inc.