Design of 5 GHz-Band Power Amplifier with On-Chip Matching Circuits Using CPW Impedance (K) Inverters

Ramesh Kumar POKHAREL  Haruichi KANAYA  Keiji YOSHIDA  

IEICE TRANSACTIONS on Electronics   Vol.E91-C   No.11   pp.1824-1827
Publication Date: 2008/11/01
Online ISSN: 1745-1353
DOI: 10.1093/ietele/e91-c.11.1824
Print ISSN: 0916-8516
Type of Manuscript: LETTER
Category: Microwaves, Millimeter-Waves
on-chip CPW impedance-matching circuit,  5GHz-band wireless LAN,  λ/4 resonator,  power amplifier,  

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This Letter employs transmission-line theory for the impedance-matching circuits for a single-chip power amplifier (PA) and verifies for 5 GHz-band wireless LAN (IEEE 802.11a) applications. The presented matching circuits are composed of conductor-backed coplanar waveguide (CPW) meander-line resonators and impedance (K) inverters. One of the advantages of the presented circuits is that it can save on-chip space occupied by the matching circuits compared to that using the spiral inductors, thus reducing the cost. The prototype chip, which consists of PA and matching circuits, is designed employing the presented theory and fabricated. A few of the measured results to verify the design theory are presented.