公开(公告)号：US10250194B2

公开(公告)日：2019-04-02

申请号：US15085477

申请日：2016-03-30

Applicant: Analog Devices Global

Inventor： Patrick Pratt ,  Joseph Bradford Brannon ,  Ronald Dale Turner

IPC: H03F3/04 ,  H03F1/02 ,  H03F1/32 ,  H03F3/19 ,  H03F3/24 ,  H04B1/04 ,  H03F3/21 ,  H03K5/15

Abstract: An envelope tracking scheme can be used, such as to modulate a supply node of a power amplifier circuit to improve efficiency. For example, a magnitude or amplitude envelope of a signal to be modulated can be scaled and used to drive a node, such as a drain, of the power amplifier circuit. An envelope tracking signal can be generated such as having a bandwidth that is compressed as compared to a full-bandwidth envelope signal. A peak-value “look ahead” technique can be used, for example, so that amplitude compression or clipping of the transmit signal is suppressed when the bandwidth-compressed envelope tracking signal is used to modulate a supply node of the power amplifier used to amplify the transmit signal.

公开(公告)号：US20170141736A1

公开(公告)日：2017-05-18

申请号：US15085477

申请日：2016-03-30

Applicant: Analog Devices Global

Inventor： Patrick Pratt ,  Joseph Bradford Brannon ,  Ronald Dale Turner

IPC: H03F1/02 ,  H03F3/21 ,  H03K5/15 ,  H03F3/19

CPC classification number: H03F1/0222 ,  H03F1/3247 ,  H03F3/19 ,  H03F3/21 ,  H03F3/245 ,  H03F2200/102 ,  H03F2200/165 ,  H03F2200/336 ,  H03F2200/36 ,  H03F2200/411 ,  H03F2200/451 ,  H03F2200/504 ,  H03K5/15046 ,  H04B1/0475

Abstract: An envelope tracking scheme can be used, such as to modulate a supply node of a power amplifier circuit to improve efficiency. For example, a magnitude or amplitude envelope of a signal to be modulated can be scaled and used to drive a node, such as a drain, of the power amplifier circuit. An envelope tracking signal can be generated such as having a bandwidth that is compressed as compared to a full-bandwidth envelope signal. A peak-value “look ahead” technique can be used, for example, so that amplitude compression or clipping of the transmit signal is suppressed when the bandwidth-compressed envelope tracking signal is used to modulate a supply node of the power amplifier used to amplify the transmit signal.