-
公开(公告)号：US20220376665A1
公开(公告)日：2022-11-24
申请号：US17817018
申请日：2022-08-03
Applicant: Murata Manufacturing Co., Ltd.
Inventor： Kenji TAHARA , Syunji YOSHIMI , Kazuhiro IKARASHI , Yusuke TANAKA , Kenichi SHIMAMOTO , Masatoshi HASE
Abstract: The present disclosure facilitates impedance matching between a power amplifier and filters. A radio-frequency circuit includes a power amplifier, a plurality of transmit filters, a switch, a plurality of first matching networks, and a second matching network. The switch switches the plurality of transmit filters to be coupled to the power amplifier. The plurality of first matching networks are coupled between the plurality of transmit filters and the switch. The second matching network is coupled between the power amplifier and the switch. The second matching network includes a transmission line transformer.
-
公开(公告)号：US20220368284A1
公开(公告)日：2022-11-17
申请号：US17815288
申请日：2022-07-27
Applicant: Murata Manufacturing Co., Ltd.
Inventor： Kenji TAHARA , Yusuke TANAKA , Yoshiaki SUKEMORI
Abstract: A current flowing through a transistor of a final-stage amplifier is suppressed. A power amplification circuit includes a driving-stage amplifier, a final-stage amplifier, a power supply terminal, a first voltage control circuit, and a second voltage control circuit. The driving-stage amplifier includes a first transistor having a first input terminal, a first output terminal, and a first ground terminal. The final-stage amplifier includes a second transistor having a second input terminal, a second output terminal, and a second ground terminal. The first voltage control circuit is connected between the power supply terminal and the first output terminal, and controls a first power supply voltage applied to the first transistor. The second voltage control circuit is connected between the power supply terminal and the second output terminal, and controls a second power supply voltage applied to the second transistor.
-
公开(公告)号：US20250047250A1
公开(公告)日：2025-02-06
申请号：US18922573
申请日：2024-10-22
Applicant: Murata Manufacturing Co., Ltd.
Inventor： Kenji TAHARA , Ryo WAKABAYASHI , Kae YAMAMOTO , Toshiki MATSUI
Abstract: A radio frequency circuit that includes a carrier amplifier, a transmission line transformer having a main line and a sub line, a signal output terminal, a voltage supply terminal and a capacitor, wherein the main line has one end connected to an output end of a peak amplifier, the main line has another end connected to the signal output terminal, the sub line has one end connected to the one end of the main line, the sub line has another end connected to the voltage supply terminal, and the peak amplifier has the output end connected to the voltage supply terminal with the capacitor interposed therebetween.
-
公开(公告)号：US20240429871A1
公开(公告)日：2024-12-26
申请号：US18823707
申请日：2024-09-04
Applicant: Murata Manufacturing Co., Ltd.
Inventor： Kenji TAHARA , Yuuki NAKANO , Kae YAMAMOTO
Abstract: A high-frequency module is disclosed, comprising a carrier amplifier, peak amplifiers, a transformer, a phase-shifting line, and bias circuits, all integrated into a semiconductor IC. The input terminals of the semiconductor IC are connected to the input ends of both the carrier and peak amplifiers, while the output terminals are connected to their respective output ends. The transformer has one end connected to the output terminal, with the other end connected to the output terminal via the phase-shifting line. Additionally, the bias circuits are connected to the carrier amplifier and the peak amplifiers to regulate their operation.
-
公开(公告)号：US20240305247A1
公开(公告)日：2024-09-12
申请号：US18666857
申请日：2024-05-17
Applicant: Murata Manufacturing Co., Ltd.
Inventor： Kenji TAHARA , Takeshi KOGURE , Kae YAMAMOTO
CPC classification number: H03F1/0288 , H03F3/245 , H03F2200/451
Abstract: A power amplifier circuit includes a carrier amplifier, a peak amplifier, an external output terminal, a combiner that includes an input terminal connected to an output terminal of the power amplifier, an input terminal connected to an output terminal of the power amplifier, and an output terminal connected to the external output terminal, a bias circuit that supplies a DC bias current to the carrier amplifier, a bias circuit that supplies a DC bias current to the peak amplifier, and a current limit circuit that is connected between the power amplifier and the bias circuit and that is configured to change a magnitude of the DC bias current according to a magnitude of a power supply voltage applied to the power amplifier circuit.
-
Patent Agency Ranking
公开(公告)号：US20240275412A1
公开(公告)日：2024-08-15
申请号：US18625227
申请日：2024-04-03
Applicant: Murata Manufacturing Co., Ltd.
Inventor： Hiroki SHOUNAI , Kenji TAHARA
CPC classification number: H04B1/006 , H03F1/56 , H03F3/245 , H03F2200/171 , H03F2200/387 , H03F2200/451
Abstract: A radio frequency circuit includes power amplifiers, an input side coil and an output side coil, a filter whose pass band is a first band, a filter whose pass band is a second band, a filter whose pass band is a third band, a switch connected between ground and a path connecting one end portion of the output side coil and the filter, a switch connected between the ground and a path connecting the other end portion of the output side coil and the filter, a switch arranged in series in the path in between the switch and the filter, and a switch arranged in series in the path connecting the filter and a path connecting the switch and the switch, wherein no switch is arranged in series in the path.
-
公开(公告)号：US20240204739A1
公开(公告)日：2024-06-20
申请号：US18589440
申请日：2024-02-28
Applicant: Murata Manufacturing Co., Ltd.
Inventor： Kenji TAHARA , Ryo WAKABAYASHI , Kae YAMAMOTO
CPC classification number: H03F3/245 , H03F1/0288 , H03F2200/451
Abstract: A radio frequency circuit includes a carrier amplifier, a peaking amplifier, an input-side coil, an output-side coil, harmonic reduction circuits, and a phase shift line. One end of the input-side coil is connected to the carrier amplifier, and the other end thereof is connected to the peaking amplifier. In the harmonic reduction circuit, an inductor and a capacitor that are connected in series are disposed in series on a path connecting the carrier amplifier and the ground. The harmonic reduction circuit has an inductor and a capacitor that are connected in series and an inductor connected in parallel to the capacitor. The inductor and the capacitor are disposed in series on a path connecting the peaking amplifier and the ground.
-
公开(公告)号：US20240162860A1
公开(公告)日：2024-05-16
申请号：US18408591
申请日：2024-01-10
Applicant: Murata Manufacturing Co., Ltd.
Inventor： Kenji TAHARA , Kae YAMAMOTO
CPC classification number: H03F1/0233 , H03F3/245 , H03F2200/105 , H03F2200/451
Abstract: A power amplifier circuit includes an external input terminal, an external output terminal, a power amplifier connected to the external input terminal, power amplifiers, a power supply terminal connected to the power amplifier, and a power supply terminal connected to the power amplifier. The power amplifiers are connected in parallel with each other between the power amplifier and the external output terminal. A first power supply voltage which is variable to multiple discrete first voltage levels is supplied to the power amplifier via the power supply terminal. A second power supply voltage which is variable to multiple discrete second voltage levels is supplied to the power amplifier via the power supply terminal. The multiple discrete second voltage levels are different from the multiple discrete first voltage levels.
-
公开(公告)号：US20240113668A1
公开(公告)日：2024-04-04
申请号：US18528810
申请日：2023-12-05
Applicant: Murata Manufacturing Co., Ltd.
Inventor： Kenji TAHARA , Kae YAMAMOTO , Yoshiaki SUKEMORI
CPC classification number: H03F3/24 , H03F3/66 , H03F2200/171 , H03F2200/451 , H03F2200/541
Abstract: An amplifier circuit includes amplifiers, transformers, and a transmission line. A first end of an input-side coil is connected to an output terminal of the amplifier, a second end of the input-side coil is connected to an output terminal of the amplifier via the transmission line, a first end of an input-side coil is connected to an output terminal of the amplifier, a second end of the input-side coil is connected to the output terminal of the amplifier via the transmission line, a first end of an output-side coil is connected to an output terminal, a second end of the output-side coil is connected to a ground, a first end of an output-side coil is connected to an output terminal, and a second end of the output-side coil is connected to the ground.
-
公开(公告)号：US20240097626A1
公开(公告)日：2024-03-21
申请号：US18520587
申请日：2023-11-28
Applicant: Murata Manufacturing Co., Ltd.
Inventor： Kenji TAHARA , Ryo WAKABAYASHI , Kae YAMAMOTO , Yoshiaki SUKEMORI
CPC classification number: H03F3/211 , H03F3/213 , H03F2200/451
Abstract: A radio frequency circuit includes a carrier amplifier, a peak amplifier, a transformer, and an impedance converting circuit. One end of an input coil is connected to an output of the carrier amplifier, one end of an output coil is connected to an output terminal. The impedance converting circuit includes main and auxiliary lines. One end of the main line is connected to an output of the peak amplifier, and the other end of the main line is connected to the other end of the input coil. One end of the auxiliary line is connected to the one end of the main line, and the other end of the auxiliary line is connected to ground. A first direction from the one end to the other end of the main line, and a second direction from the other end to the one end of the auxiliary line (302) are the same.
-
-
-
-
-
-
-
-
-
Search Results
44
records
(took 0.024 seconds)
