Design of coplanar waveguide matching circuit for RF-CMOS front-end

Haruichi Kanaya, Tetsuya Nakamura, Koji Kawakami, Keiji Yoshida

Research output: Contribution to journalArticlepeer-review

7 Citations (Scopus)


For enhanced performance with smaller transceiver size at microwave frequencies, a design method is proposed in which the impedance matching network is included in the filter and integrated with the antenna. In this paper, a low noise amplifier (LNA) and a power amplifier (PA) are designed by the CMOS process. A method is presented in which the input and output impedances are matched on the chip by a matching circuit using distributed transmission lines. As the distributed transmission lines, coplanar waveguides (CPW) are used for realization of miniaturized design. First, the RF characteristics of the CPW meander line are evaluated by an electromagnetic field simulator and are compared with measured results. Next, an amplifier integrated with matching circuits is designed and its performance is predicted by a simulator. The targeted frequency of operation is 2.4 GHz for wireless LAN (IEEE802.11b).

Original languageEnglish
Pages (from-to)19-26
Number of pages8
JournalElectronics and Communications in Japan, Part II: Electronics (English translation of Denshi Tsushin Gakkai Ronbunshi)
Issue number7
Publication statusPublished - Jul 2005

All Science Journal Classification (ASJC) codes

  • Physics and Astronomy(all)
  • Computer Networks and Communications
  • Electrical and Electronic Engineering


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