公开(公告)号：US20180309415A1

公开(公告)日：2018-10-25

申请号：US15911187

申请日：2018-03-05

Applicant: MEDIATEK INC.

Inventor： Tsun-Yuan Fan ,  Tze-Chien Wang

IPC: H03F1/34 ,  H03F3/45

Abstract: The present invention provides an amplifier circuit, wherein the amplifier circuit includes an operational amplifier and a feedback path. The operational amplifier has an input terminal and an output terminal, and is arranged for receiving an input signal to generate an output signal. The feedback path is coupled between the input terminal and the output terminal of the operational amplifier, wherein the feedback path comprises at least two poly resistors, and a depletion region of at least one of the two poly resistors is biased by the output signal generated by the operational amplifier.

公开(公告)号：US10461702B2

公开(公告)日：2019-10-29

申请号：US15911187

申请日：2018-03-05

Applicant: MEDIATEK INC.

Inventor： Tsun-Yuan Fan ,  Tze-Chien Wang

IPC: H03F1/34 ,  H03F3/45 ,  H03F1/32 ,  H01L49/02

Abstract: The present invention provides an amplifier circuit, wherein the amplifier circuit includes an operational amplifier and a feedback path. The operational amplifier has an input terminal and an output terminal, and is arranged for receiving an input signal to generate an output signal. The feedback path is coupled between the input terminal and the output terminal of the operational amplifier, wherein the feedback path comprises at least two poly resistors, and a depletion region of at least one of the two poly resistors is biased by the output signal generated by the operational amplifier.

公开(公告)号：US09716499B2

公开(公告)日：2017-07-25

申请号：US14962560

申请日：2015-12-08

Applicant: MediaTek Inc.

Inventor： Tsun-Yuan Fan ,  Wen-Hua Chang

IPC: H03F3/04 ,  H03K19/0175 ,  H03F3/19 ,  H04B1/04 ,  H03F3/45 ,  G05F3/26

CPC classification number: H03K19/017509 ,  G05F3/26 ,  H03F3/19 ,  H03F3/24 ,  H03F3/45188 ,  H03F3/45273 ,  H03F3/45659 ,  H03F2200/84 ,  H03F2200/91 ,  H03F2203/45008 ,  H03F2203/45082 ,  H03F2203/45418 ,  H03F2203/45481 ,  H04B1/04 ,  H04B2001/0408

Abstract: A current amplifier and a transmitter using the same. The current amplifier has a first and second transistor and a voltage level shifting unit. The first transistor has a gate receiving an input current and a drain receiving a driving current. The voltage level shifting unit providing a voltage shift is coupled between the drain of the first transistor and the gate of the second transistor. An output current is generated at the drain of the second transistor.