Search International and National Patent Collections

1. (WO2014208779) LINEAR COMPOUND TRANSMITTER IN WHICH COMPOUND POWER AMPLIFICATION METHOD IS USED

Pub. No.:    WO/2014/208779    International Application No.:    PCT/JP2014/067993
Publication Date: Thu Jan 01 00:59:59 CET 2015 International Filing Date: Sat Jun 28 01:59:59 CEST 2014
IPC: H03F 1/02
H03F 3/24
H03F 3/68
H04B 1/04
Applicants: FODAN CO. LTD.
フォーダン株式会社
Inventors: KURIHARA, Hiroshi
栗原 宏
Title: LINEAR COMPOUND TRANSMITTER IN WHICH COMPOUND POWER AMPLIFICATION METHOD IS USED
Abstract:
 The present invention provides a compound transmitter having power efficiency characteristics and distortion characteristics superior, over a wide band, to those of a Doherty transmitter, and having fewer elements constituting an RF circuit. The present invention is therefore provided with a compound amplifier (201) for generating a signal (z) (assistance signal) obtained by the amplitude modulation of a carrier signal from an RF modulation signal (a) (main signal); power-modulating, using two power amplifiers (50, 51), a signal (S1) obtained by adding together (a) and (z), and a signal (S2) obtained by subtracting (z) from (a); and setting, as a transmitter output point, the point (p1) where the respective outputs are combined via impedance inverters (60, 61), the assistance signal (z) being generated under conditions in which the size of the envelope of either (S1) or (S2) is fixed.