公开(公告)号：US10171034B2

公开(公告)日：2019-01-01

申请号：US15462923

申请日：2017-03-20

申请人： MEDIATEK INC.

发明人： Chien-Wei Tseng ,  Ian Tseng ,  Ming-Da Tsai ,  Yangjian Chen ,  Chien-Cheng Lin

IPC分类号： H03D7/12 ,  H03D7/16

摘要： A harmonic-rejection mixer apparatus includes a mixing circuit and a combining circuit. The mixing circuit receives mixes an input signal and a first local oscillator (LO) signal to generate a first output signal, and mixes the same input signal and a second LO signal to generate a second output signal, wherein the first LO signal and the second LO signal have a same frequency but different phases. The combining circuit combines the first output signal and the second output signal, wherein harmonic rejection is at least achieved by combination of the first output signal and the second output signal.

公开(公告)号：US09960947B2

公开(公告)日：2018-05-01

申请号：US15647275

申请日：2017-07-12

申请人： MEDIATEK INC.

发明人： Chien-Cheng Lin ,  Ming-Da Tsai

IPC分类号： H04B1/00 ,  H04L27/36 ,  H03D7/16 ,  H03F1/32 ,  H03C3/08 ,  H04B1/04

CPC分类号： H04L27/366 ,  H03C3/08 ,  H03D7/166 ,  H03F1/14 ,  H03F1/3205 ,  H03F1/3211 ,  H03F1/3264 ,  H03F3/21 ,  H03F3/45179 ,  H03F3/45183 ,  H03F2200/21 ,  H03F2200/213 ,  H03F2200/228 ,  H03F2200/249 ,  H03F2200/471 ,  H03F2200/489 ,  H03F2200/492 ,  H03F2200/534 ,  H03F2200/75 ,  H03F2201/3218 ,  H03F2203/45036 ,  H03F2203/45101 ,  H03F2203/45112 ,  H03F2203/45134 ,  H03F2203/45136 ,  H03F2203/45138 ,  H03F2203/45146 ,  H03F2203/45151 ,  H03F2203/45156 ,  H03F2203/45168 ,  H03F2203/45172 ,  H03F2203/45208 ,  H03F2203/45256 ,  H03F2203/45292 ,  H03F2203/45312 ,  H03F2203/45356 ,  H03F2203/45374 ,  H03F2203/45386 ,  H03F2203/45402 ,  H03F2203/45436 ,  H03F2203/45544 ,  H03F2203/45596 ,  H03F2203/45622 ,  H04B2001/0408

摘要： A compensation circuit of a power amplifier includes a varactor, a voltage sensor and a control circuit. The varactor is coupled to an input terminal of the power amplifier. The voltage sensor is arranged for detecting an amplitude of an input signal of the power amplifier to generate a detecting result. The control circuit is coupled to the varactor and the voltage sensor, and is arranged for controlling a bias voltage of the varactor to adjust a capacitance of the varactor according to the detecting result.