A novel programmable predistortion circuit for broadband InGaP/GaAs HBT power amplifier

✍ Scribed by Huai Gao; Rong Wang; Haitao Zhang; Hongxi Xue; G. P. Li

• Publisher: John Wiley and Sons
• Year: 2006
• Tongue: English
• Weight: 339 KB
• Volume: 49
• Category: Article
• ISSN: 0895-2477
• DOI: 10.1002/mop.22080

✦ Synopsis

Abstract

A novel programmable MMIC predistortion circuit as an input stage of a broadband power amplifier (PA) is proposed and designed. By varying its reference voltage, one can adjust the magnitude of gain expansion and negative phase deviation to compensate the typical nonlinearities of the following stages in a PA, as well as temperature and fabrication variations. A gain expansion of 4–5 dB and a phase improvement of 5–6° are achieved in simulation. The measurement results show that P~1dB~is improved by 3 dB and adjacent channel power rejection ratio (ACPR) by 5 dBc at 27 dBm output power. © 2006 Wiley Periodicals, Inc. Microwave Opt Technol Lett 49: 141–143, 2007; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.22080