Efficient numerical CAD technique for RF and microwave amplifiers

• Published in: International journal of RF and microwave computer-aided engineering Vol. 8; no. 2; pp. 131 - 141
• Main Authors: Kerherve, E., Jarry, P., Martin, P. M.
• Format: Journal Article
• Language: English
• Published: New York John Wiley & Sons, Inc 01.03.1998
• Subjects: matching networks; microwave CAD; real-frequency technique
• ISSN: 1096-4290; 1099-047X
• DOI: 10.1002/(SICI)1099-047X(199803)8:2<131::AID-MMCE6>3.0.CO;2-Q

The real frequency technique (RFT) is an efficient numerical method to design the matching networks of microwave active circuits. It provides several advantages over most of the usual techniques. By directly including measured scattering and noise parameter data, it does not require any rational functions or circuit models. Moreover, a predetermined matching circuit topology is not necessary. The described method also allows the design of stability‐guaranteed broadband circuits when employing potentially unstable transistors. With the Levenberg–Merquardt algorithm, the RFT can be applied to simultaneously optimize transducer power gain, input and output VSWRs, noise figure, and group delay of a multistage microwave active circuit. Applications as different as low‐noise amplifier, active filter, or broadband amplifier are possible. © 1998 John Wiley & Sons, Inc. Int J RF and Microwave CAE 8: 131–141, 1998.