Title :
A novel amplitude and phase linearizing technique for microwave power amplifiers
Author :
Nakayama, Makoto ; Mori, Kazuo ; Yamauchi, Kazuto ; Itoh, Yoshio ; Takagi, Toshiyuki
Author_Institution :
Electri-Optics & Microwave Syst. Lab., Mitsubishi Electr. Corp., Kanagawa, Japan
Abstract :
A novel amplitude and phase linearizing technique for microwave power amplifiers has been developed. It employs a series feedback amplifier with a large source inductance as a predistortion linearizer, which provides positive amplitude and negative phase deviations for input power and can compensate for AM-AM and AM-PM distortions of power amplifiers. Applying this technique to a 1.9 GHz MMIC power amplifier for use in the Japanese Personal Handy-Phone System (PHS), an improvement of adjacent channel leakage power (ACP) up to 7 dB has been achieved when it is used for /spl pi//4-shift QPSK signal.<>
Keywords :
MMIC power amplifiers; UHF power amplifiers; feedback amplifiers; linearisation techniques; mobile radio; personal communication networks; quadrature phase shift keying; /spl pi//4-shift QPSK signal; 1.9 GHz; AM-AM distortions; AM-PM distortions; Japanese Personal Handy-Phone system; MMIC power amplifier; adjacent channel leakage power; amplitude linearizing technique; input power; microwave power amplifiers; negative phase deviations; phase linearizing technique; positive amplitude deviations; predistortion linearizer; series feedback amplifier; source inductance; FETs; Feedback amplifiers; Gain measurement; Impedance matching; Inductance; Microwave amplifiers; Microwave theory and techniques; Phase measurement; Power amplifiers; Predistortion;
Conference_Titel :
Microwave Symposium Digest, 1995., IEEE MTT-S International
Conference_Location :
Orlando, FL, USA
Print_ISBN :
0-7803-2581-8
DOI :
10.1109/MWSYM.1995.406246
