公开(公告)号：US09729108B2

公开(公告)日：2017-08-08

申请号：US14996809

申请日：2016-01-15

Applicant: Electronics and Telecommunications Research Institute

Inventor： Seung Hyun Jang ,  Bong Hyuk Park ,  Nam Sik Ryu ,  Dong Seung Kwon

IPC: H03G3/30 ,  H03F1/02 ,  H03F3/19 ,  H03F3/24

CPC classification number: H03F1/0222 ,  H03F3/19 ,  H03F3/245 ,  H03F2200/102 ,  H03F2200/451 ,  H03G3/30 ,  H03G3/3005

Abstract: Provided is an apparatus for adjusting an envelope signal delay in an envelope-tracking power amplifier. The apparatus includes: an envelope signal providing unit configured to provide an envelope signal; a variable negative group delay unit configured to adjust a group delay of the envelope signal received from the envelope signal providing unit and output the adjusted envelope signal; an envelope modulator configured to modulate the envelope signal outputted from the variable negative group delay unit; a group delay difference detecting unit configured to detect a group delay difference between the envelope signal which is outputted from the envelope signal providing unit and the envelope signal which is outputted from the envelope modulator; and a control signal generating unit configured to generate a control signal to control a group delay value of the variable negative group delay unit according to the group delay difference.