发明名称 |
Radio transmitter and envelope tracking power supply control method |
摘要 |
The envelope tracking power supply includes a plurality of variable voltage supplies. A power supply controller of a power amplifier controls the plurality of variable voltage supplies so as to precisely divide the power supply voltage in a high frequency area, based on the voltage distribution of a received transmitted base band signal, in order to maximize the power added efficiency of the power amplifier. The power supply controller includes a threshold memory including a plurality of first zones, and a frequency memory including a plurality of second zones. The power supply controller changes the threshold held in the first zones so that each second zone approaches the average of the second zones. |
申请公布号 |
US8600321(B2) |
申请公布日期 |
2013.12.03 |
申请号 |
US201213477108 |
申请日期 |
2012.05.22 |
申请人 |
NAMBU HIROI;OHNISHI MASAMI;HITACHI, LTD. |
发明人 |
NAMBU HIROI;OHNISHI MASAMI |
分类号 |
H01Q11/12;H04B1/04 |
主分类号 |
H01Q11/12 |
代理机构 |
|
代理人 |
|
主权项 |
|
地址 |
|