Considerations for Developing a Highly Efficient, High-power Shortwave AM Transmitter

Author

Yamazoe, Masahiko ; Haeiwa, Kazuhisa ; Hirose, Shoji ; Wakai, Kazuaki

Author_Institution

NHK Eng. Adm. Dept., Tokyo

fYear

2007

fDate

2-5 April 2007

Firstpage

1035

Lastpage

1042

Abstract

This paper describes a study on high power short-wave AM transmitter with high efficiency. First, we fabricated a new power amplifier operating at short-wave band (3M-30MHz) using RF MOSFETs and a new output circuit for obtaining high efficiency. Next, we proposed a new power combiner with excellent linearity by tuning the transmitter output circuit including stray capacitance and inductance. In addition, we proposed an evolutional short-wave AM transmitter since conventional MF band digital AM modulation method can not be introduced because of losses caused by parasitic diode of RF MOSFETs.

Keywords

HF amplifiers; MOSFET; power amplifiers; radio transmitters; RF MOSFET; digital AM modulation method; frequency 3 MHz to 30 MHz; power amplifier; power combiner; short-wave AM transmitter; short-wave band; stray capacitance; stray inductance; transmitter output circuit; Circuit optimization; High power amplifiers; Inductance; Linearity; MOSFETs; Parasitic capacitance; Power combiners; Radio frequency; Radiofrequency amplifiers; Transmitters; High-efficiency; Power amplifier; Short-wave; Transmitter;

fLanguage

English

Publisher

ieee

Conference_Titel

Power Conversion Conference - Nagoya, 2007. PCC '07

Conference_Location

Nagoya

Print_ISBN

1-4244-0844-X

Electronic_ISBN

1-4244-0844-X

Type

conf

DOI

10.1109/PCCON.2007.373094

Filename

4239284