Title :
High efficiency distributed amplifier using optimum transmission line
Author :
Jeong, Sigyun ; Choi, Heungjae ; Jeong, Yongchae ; Kenney, J. Stevenson ; Kim, Chuldong
Author_Institution :
Chonbuk Nat. Univ., Jeonju
Abstract :
In this paper, we performed numerical analysis on reversed current of distributed amplifier (DA) based on transmission line theory and proposed optimum transmission line (OTL) to cancel reversed currents. This OTL has improved electrical performances of DA. The distributed amplifier using optimum transmission line (DAOTL) has been implemented with pHEMT transistor. Due to high capacitance of pHEMT, cutoff frequency is decided to 3.6 GHz. As a result of measurement, we could obtain maximum gain of 14.5 dB and minimum gain of 12.8 dB inner operation band. Moreover, we could PAE of 25.6% which is higher about 7.6% than the conventional DA (CDA) at 3 GHz. The output power was obtained 10.9 dBm which is higher about 1.7 dB than the conventional at 3 GHz.
Keywords :
distributed amplifiers; high electron mobility transistors; numerical analysis; transmission line theory; high efficiency distributed amplifier; numerical analysis; optimum transmission line; pHEMT transistor; transmission line theory; Capacitance; Cutoff frequency; Distributed amplifiers; Gain; Numerical analysis; PHEMTs; Power transmission lines; Transmission line measurements; Transmission line theory; Transmission lines;
Conference_Titel :
Microwave Conference, 2007. European
Conference_Location :
Munich
Print_ISBN :
978-2-87487-001-9
DOI :
10.1109/EUMC.2007.4405386
