Title:
ディジタル振幅変調装置
Document Type and Number:
Japanese Patent JP6903499
Kind Code:
B2
Abstract:
To secure reliability by reducing stress of a power amplifier even if an antenna base enters a short-circuit state.SOLUTION: A digital amplitude modulation device according to an embodiment is configured to perform power amplification of a carrier signal based upon an audio signal input from a front stage and then supplies the resulting signal to a load connected as a rear stage, and comprises: an amplitude modulation part which has a plurality of power amplifiers connected in parallel and performs the amplitude modulation of the carrier signal; and a phase adjustment part which receives, as input, the output of the amplitude modulation part and performs phase adjustment on the received output of the amplitude modulation part and outputs the phase-adjusted output to the load. The phase adjustment part outputs the signal to the load after performing the phase adjustment so that apparent impedance of the load at an output end of the amplitude modulation part when actual impedance of the load becomes lower than usual is higher than usual.SELECTED DRAWING: Figure 1
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Inventors:
Yuki Funabashi
Makoto Katayama
Makoto Katayama
Application Number:
JP2017126564A
Publication Date:
July 14, 2021
Filing Date:
June 28, 2017
Export Citation:
Assignee:
Toshiba Corporation
Toshiba Infrastructure Systems & Solutions Corporation
Toshiba Infrastructure Systems & Solutions Corporation
International Classes:
H04B1/04; H03C1/00; H03F1/06; H03F1/52; H03F3/24; H03F3/68; H04B17/17; H04B17/18; H04L27/04
Domestic Patent References:
| JP2014127958A | ||||
| JP61084924A | ||||
| JP2004072445A | ||||
| JP4183008A |
Foreign References:
| US4181889 | ||||
| CN103107817A | ||||
| KR1020100081801A |
Attorney, Agent or Firm:
Sakai International Patent Office