公开(公告)号：US20190190547A1

公开(公告)日：2019-06-20

申请号：US16285584

申请日：2019-02-26

Applicant: Murata Manufacturing Co., Ltd.

Inventor： Satoshi TANAKA ,  Kazuo WATANABE ,  Tetsuaki ADACHI ,  Masahito NUMANAMI ,  Yasuhisa YAMAMOTO

IPC: H04B1/00 ,  H04W72/04 ,  H04L25/02

CPC classification number: H04B1/005 ,  H04L25/02 ,  H04W72/0453 ,  H04W88/06 ,  H04W88/08

Abstract: A communication unit includes the following elements. A first transmit circuit outputs a first signal or a second signal from a first input signal. A first amplifier amplifies the first signal and outputs a first amplified signal. A first signal generating circuit generates a third signal having a frequency higher than a frequency of the second signal, based on the second signal and a first reference signal. A first filter circuit receives the third signal and allows one of a frequency component representing a sum of the frequency of the second signal and a frequency of the first reference signal and a frequency component representing a difference therebetween to pass through the first filter circuit and attenuates the other one of the frequency components. A second amplifier amplifies the third signal output from the first filter circuit and outputs a second amplified signal.

公开(公告)号：US20190103841A1

公开(公告)日：2019-04-04

申请号：US16205904

申请日：2018-11-30

Applicant: Murata Manufacturing Co., Ltd.

Inventor： Satoshi TANAKA ,  Tetsuaki ADACHI ,  Kazuo WATANABE ,  Masahito NUMANAMI ,  Yasuhisa YAMAMOTO

IPC: H03F1/02 ,  H03F3/193 ,  H03F3/21 ,  H03F3/191 ,  H03F1/56

CPC classification number: H03F1/0205 ,  H03F1/0261 ,  H03F1/56 ,  H03F3/191 ,  H03F3/193 ,  H03F3/21 ,  H03F2200/18 ,  H03F2200/222 ,  H03F2200/387 ,  H03F2200/451 ,  H03F2200/75

Abstract: Provided is a power amplification circuit that includes: an amplifier that amplifies an input signal and outputs an amplified signal; a first bias circuit that supplies a first bias current or voltage to the amplifier; a second bias circuit that supplies a second bias current or voltage to the amplifier; a first control circuit that controls the first bias current or voltage; and a second control circuit that controls the second bias current or voltage. The current supplying capacity of the first bias circuit is different from the current supplying capacity of the second bias circuit.