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公开(公告)号:JP2017220893A
公开(公告)日:2017-12-14
申请号:JP2016116301
申请日:2016-06-10
Applicant: 株式会社村田製作所
IPC: H03G3/10
CPC classification number: H03G3/3042 , H03F1/223 , H03F1/56 , H03G1/0023 , H03G1/0035 , H03G1/0088 , H03F2200/222 , H03F2200/294 , H03F2200/318 , H03F2200/387 , H03F2200/451 , H03G2201/106 , H03G3/3052
Abstract: 【課題】増幅器の利得を所望の値に近づくように制御する。 【解決手段】本発明の一実施形態による増幅器1は、接地点SGと電源Vddとの間に接続された第1トランジスタFET1および第2トランジスタFET2を備える。第1トランジスタFET1の制御端子Gは、入力端子Pinに接続されている。第1トランジスタFET1の第1端子Sは、接地点SGに接続されている。第2トランジスタFET2の第2端子Dは、出力端子Poutに接続されている。増幅器1は、インピーダンス要素L10と、可変抵抗部Rv11とをさらに備える。インピーダンス要素L10は、第2トランジスタFET2の第2端子Dおよび電源Vddの間に接続されている。可変抵抗部Rv11は、第1トランジスタFET1の第2端子Dおよび第2トランジスタFET2の第1端子Sの間に接続されている。 【選択図】図2
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公开(公告)号:JP2017103655A
公开(公告)日:2017-06-08
申请号:JP2015236095
申请日:2015-12-02
Applicant: 株式会社村田製作所
IPC: H03F3/24
CPC classification number: H03G1/0094 , H03F1/56 , H03F3/19 , H03F3/213 , H03F3/245 , H03F3/72 , H03F2200/111 , H03F2200/165 , H03F2200/222 , H03F2200/318 , H03F2200/387 , H03F2203/7209 , H03G2201/106 , H03G2201/40
Abstract: 【課題】送受信周波数間隔が狭い周波数帯域において、受信周波数帯域のノイズの発生を抑制する電力増幅モジュールを提供する。 【解決手段】電力増幅モジュール100Aは、第1の周波数帯域における第1の送信信号が入力される第1の入力端子IN1と、第1の周波数帯域よりも送受信周波数間隔が狭い第2の周波数帯域における第2の送信信号が入力される第2の入力端子IN2と、第1の送信信号が入力され、第1の送信信号を増幅した第1の増幅信号を出力する第1の増幅回路PA3と、第2の送信信号が入力され、第2の送信信号を増幅した第2の増幅信号を出力する第2の増幅回路PA4と、第1又は第2の増幅信号が入力され、第1又は第2の増幅信号を増幅した出力信号を出力する第3の増幅回路PA5と、第2の入力端子と第2の増幅回路との間に設けられ、第2の周波数帯域における受信周波数帯域の成分を減衰させる減衰回路MN4とを備える。 【選択図】図1
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公开(公告)号:US12068731B2
公开(公告)日:2024-08-20
申请号:US17884697
申请日:2022-08-10
Applicant: D'Amore Engineering, LLC
Inventor: Anthony T. D'Amore , Juan Rodriguez
CPC classification number: H03G3/3005 , G06F3/162 , H03F3/183 , H04R3/02 , H03F2200/03 , H03G2201/106
Abstract: An amplifier power attenuator utilizes an amplified audio feedback signal from an audio amplifier (which is driving a loudspeaker), along with a user-set impedance and a maximum voltage set-point reflective of the operational parameters of the loudspeaker, to attenuate an audio signal prior to amplification thereby preventing damage to the loudspeaker. The impedance of a variable impedance optocoupler is changed to adjust the attenuation of the audio signal to one of a plurality of predetermined attenuation levels responsive to an error between a voltage level of the feedback signal and the maximum voltage set-point. The error is reflected in a counter value having a linear or non-linear relationship with the error dependent upon a magnitude of the error; the counter value is assessed against a plurality of target values associated with respective ones of the predetermined attenuation levels to identify the attenuation to be applied to the audio signal.
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公开(公告)号:US11888450B2
公开(公告)日:2024-01-30
申请号:US17874186
申请日:2022-07-26
Applicant: Biamp Systems, LLC
Inventor: Aaron Faulstich
CPC classification number: H03F1/3264 , G10L25/21 , H03G3/3005 , H03G11/008 , H04R3/007 , H04R3/02 , H04R3/04 , H03G2201/106
Abstract: Example embodiments provide a process that includes one or more of receiving an audio signal at a feedback compressor circuit, determining how much to attenuate the audio signal when a power level of the audio signal exceeds a threshold power level, combining the audio signal with an auxiliary attenuation signal from an auxiliary attenuation source and a compressed attenuation signal from the feedback compressor circuit to create a combination signal, and generating an audio output signal of the feedback compressor circuit based on the combination signal.
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公开(公告)号:US11757479B2
公开(公告)日:2023-09-12
申请号:US17489381
申请日:2021-09-29
Applicant: Texas Instruments Incorporated
Inventor: Sarma Sundareswara Gunturi , Venkateshwara Reddy Pothapu , Chandrasekhar Sriram , Raju Kharataram Chaudhari , Sai Vaibhav Batchu , Pankaj Gaur
CPC classification number: H04B1/0475 , H03G3/3036 , H03G2201/106
Abstract: A TX-TX pre-compensation system that estimates unwanted coupling in a victim transmit chain caused by an aggressor transmit chain and injects a pre-compensation signal to cancel out the estimated coupling. In some embodiments, a signal measurement module estimates the amplitude, phase, and envelope delay of the coupling and an isolation pre-compensation module generates the pre-compensation signal based on the estimated amplitude, the estimated phase, the estimated envelope delay, and the difference between the carrier frequencies of the transmit chains. Since the phase of the coupling may be affected by the carrier frequency of the transmit chains, in some embodiments the phase of the pre-compensation signal is adjusted in response to a change in carrier frequency. Since the amplitude of the coupling may be affected by attenuator gain settings, in some embodiments the amplitude of the pre-compensation signal may be adjusted in response to a change in attenuator gain setting.
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公开(公告)号:US20180241375A1
公开(公告)日:2018-08-23
申请号:US15903220
申请日:2018-02-23
Applicant: SUMITOMO ELECTRIC DEVICE INNOVATIONS, INC.
Inventor: Akio Oya , Makoto Kondo
CPC classification number: H03H11/245 , H01P1/22 , H03G1/0052 , H03G1/007 , H03G2201/106 , H03H7/253
Abstract: A variable attenuator (v-ATT) is disclosed. The v-ATT includes an input terminal, an output terminal, a transmission line between the input and output terminals, at least two stages provided between the transmission line and the ground, and a bias unit. Each of the stages includes a field effect transistor (FET) that varies impedance between the transmission line and the ground according to a bias provided to the gate thereof. The bias unit generates the biases each provided to the stages. One of the features of the v-ATT is that at least one of the stages receives at least one of the biases that is different from biases provided to other of the at least one of the stages.
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公开(公告)号:US20180159484A1
公开(公告)日:2018-06-07
申请号:US15578058
申请日:2016-04-28
Applicant: Qorvo US, Inc.
Inventor: Stephen James Franck , Xin Wang , Alireza Oskoui
CPC classification number: H03F1/3258 , H03F1/0205 , H03F1/0266 , H03F1/223 , H03F1/3205 , H03F1/3223 , H03F1/56 , H03F3/193 , H03F3/195 , H03F3/21 , H03F3/245 , H03F2200/108 , H03F2200/18 , H03F2200/211 , H03F2200/222 , H03F2200/228 , H03F2200/234 , H03F2200/246 , H03F2200/301 , H03F2200/318 , H03F2200/321 , H03F2200/408 , H03F2200/42 , H03F2200/435 , H03F2200/451 , H03F2200/465 , H03F2200/61 , H03F2200/75 , H03F2200/99 , H03F2201/3212 , H03F2201/3218 , H03G3/3042 , H03G2201/106 , H03G2201/40
Abstract: The present disclosure relates to a power amplifier (PA) system provided in a semiconductor device and having feed forward gain control. The PA system comprises a transmit path and control circuitry. The transmit path is configured to amplify an input radio frequency (RF) signal and comprises a first tank circuit and a PA stage. The control circuitry is configured to detect a power level associated with the input RF signal and control a first bias signal provided to the PA stage based on a first function of the power level and control a quality factor (Q) of the first tank circuit based on a second function of the power level.
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公开(公告)号:US20180152158A1
公开(公告)日:2018-05-31
申请号:US15609736
申请日:2017-05-31
Applicant: STMicroelectronics (Grenoble 2) SAS
Inventor: Michel Ayraud , Serge Ramet , Serge Pontarollo
CPC classification number: H03G3/30 , H01P1/22 , H03F1/565 , H03F3/191 , H03F2200/211 , H03F2200/294 , H03G3/3042 , H03G3/3057 , H03G2201/106
Abstract: The transmission device comprising a transmit stage configured to deliver a transmission signal on an input-output node of an antenna and comprising a power transistor coupled to the input-output node and configured to amplify a signal to be transmitted. The device comprises a receive stage configured to receive a reception signal on the input-output node and comprising an attenuator circuit configured to attenuate the reception signal. The attenuator circuit comprising the power transistor and a control circuit able to place the power transistor in a triode mode.
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公开(公告)号:US20180138874A1
公开(公告)日:2018-05-17
申请号:US15808389
申请日:2017-11-09
Applicant: SKYWORKS SOLUTIONS, INC.
Inventor: Adrian John Bergsma
CPC classification number: H03G1/0088 , H03F3/19 , H03F3/21 , H03F3/245 , H03F3/45475 , H03F2200/411 , H03F2200/451 , H03G3/3042 , H03G2201/106 , H04B10/2575 , H04L25/085 , H04L27/0002
Abstract: A broadband amplifier assembly is provided that includes a fixed gain amplifier coupled to an adjustable attenuator which is further coupled to a power amplifier. The adjustable attenuator includes a plurality of attenuation cells directly coupled in series between the input and the output of the adjustable attenuator.
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公开(公告)号:US09954504B2
公开(公告)日:2018-04-24
申请号:US15365092
申请日:2016-11-30
Applicant: MURATA MANUFACTURING CO., LTD.
Inventor: Yasushi Oyama , Takayuki Tsutsui , Kazuhito Nakai
CPC classification number: H03G1/0094 , H03F1/56 , H03F3/19 , H03F3/213 , H03F3/245 , H03F3/72 , H03F2200/111 , H03F2200/165 , H03F2200/222 , H03F2200/318 , H03F2200/387 , H03F2203/7209 , H03G2201/106 , H03G2201/40
Abstract: A power amplification module includes a first input terminal that receives a first transmit signal in a first frequency band, a second input terminal that receives a second transmit signal in a second frequency band having a narrower transmit/receive frequency interval than the first frequency band, a first amplification circuit that receives and amplifies the first transmit signal to produce a first amplified signal and outputs the first amplified signal, a second amplification circuit that receives and amplifies the second transmit signal to produce a second amplified signal and outputs the second amplified signal, a third amplification circuit that receives and amplifies the first or second amplified signal to produce an output signal and outputs the output signal, and an attenuation circuit located between the second input terminal and the second amplification circuit and configured to attenuate a receive frequency band component of the second frequency band.
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