High-power 20-100-MHz linear and efficient power-amplifier design

Sahan N., Inal M. E., Dernir Ş., TOKER C.

IEEE TRANSACTIONS ON MICROWAVE THEORY AND TECHNIQUES, cilt.56, sa.9, ss.2032-2039, 2008 (SCI-Expanded) identifier identifier

  • Yayın Türü: Makale / Tam Makale
  • Cilt numarası: 56 Sayı: 9
  • Basım Tarihi: 2008
  • Doi Numarası: 10.1109/tmtt.2008.2002238
  • Dergi Adı: IEEE TRANSACTIONS ON MICROWAVE THEORY AND TECHNIQUES
  • Derginin Tarandığı İndeksler: Science Citation Index Expanded (SCI-EXPANDED), Scopus
  • Sayfa Sayıları: ss.2032-2039
  • Anahtar Kelimeler: magnetic materials, power amplifiers (PAs), power combiners, transmission line transformers (TLTs), TRANSFORMER
  • Orta Doğu Teknik Üniversitesi Adresli: Evet

Özet

This paper presents modeling and analysis of the realization of high-power broadband RF power amplifiers (PAs) and power combiners. In the scope of the study, a model is proposed for a transmission line with a ferrite core, which is the basic building block for the transmission line transformers (TLTs) used in broadband high-power amplifiers and power combiner/divider networks as a building block. Simulated performances of the designed networks using the proposed model possess high conformity with the empirical performance of the corresponding realized networks. Therefore, broadband TLT networks with low insertion loss, high power-handling capability, and low return loss are realized. RF power combiner/divider networks with wide frequency bandwidth and high isolation are also implemented. By using class-B biased push-pull network topology, a linear and wideband RF PA is realized with high drain efficiency at high output power levels. In order to broaden the operating frequency range of the indicated amplifier, a novel technique for TIT utilization that matches the output impedance of the RF power transistor in wideband is proposed and realized. Measurement results satisfy the design specifications.