Higher‐efficiency‐biasing technique for enhancing the performance of BJT‐distributed amplifiers

Abstract

Efficiency of distributed amplifier based on bipolar junction transistors is low particularly at higher frequencies. The work presented here shows an increase in efficiency of up to three times by applying a proposed unequal biasing technique, which also eliminates the inefficient use of a dummy load at the output artificial transmission line. The proposed circuit provides a maximum power added efficiency of 27.8% which is a three‐times improvement compared with the optimized conventional distributed amplifier. © 2008 Wiley Periodicals, Inc. Microwave Opt Technol Lett 50: 2725–2727, 2008; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.23714