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公开(公告)号：US10439576B2
公开(公告)日：2019-10-08
申请号：US15808486
申请日：2017-11-09
发明人： Peihua Ye , Patrick Marcus Naraine , Adrian John Bergsma , Peter Harris Robert Popplewell , Thomas Obkircher
摘要： Aspects and examples described herein provide a variable gain amplifier circuit and assembly. In one example, a variable gain amplifier circuit includes a signal input, a signal output, and a variable gain amplifier including a plurality of unit cell groups coupled between the signal input and the signal output, the variable gain amplifier configured to provide an adjustable gain to a signal received at the signal input during each of a plurality of amplify modes of the variable gain amplifier, each of the plurality of amplify modes corresponding to at least one unit cell group of the plurality of unit cell groups. A bypass path including a fixed attenuator is coupled in parallel with the variable gain amplifier between the signal input and the signal output to selectively couple the signal input to the signal output through the fixed attenuator during a bypass mode.
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公开(公告)号：US10812030B2
公开(公告)日：2020-10-20
申请号：US16551955
申请日：2019-08-27
发明人： Peihua Ye , Patrick Marcus Naraine , Adrian John Bergsma , Peter Harris Robert Popplewell , Thomas Obkircher
摘要： Aspects and examples described herein provide a variable gain amplifier circuit and assembly. In one example, a variable gain amplifier circuit includes a signal input, a signal output, and a variable gain amplifier including a plurality of unit cell groups coupled between the signal input and the signal output, the variable gain amplifier configured to provide an adjustable gain to a signal received at the signal input during each of a plurality of amplify modes of the variable gain amplifier, each of the plurality of amplify modes corresponding to at least one unit cell group of the plurality of unit cell groups. A bypass path including a fixed attenuator is coupled in parallel with the variable gain amplifier between the signal input and the signal output to selectively couple the signal input to the signal output through the fixed attenuator during a bypass mode.
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公开(公告)号：US20190334493A1
公开(公告)日：2019-10-31
申请号：US16507723
申请日：2019-07-10
摘要： Amplifier systems and methods are provided that include a fixed gain amplification stage coupled to an adjustable attenuation stage further coupled to a variable gain amplification stage. A controller controls an amount of attenuation provided by the adjustable attenuation stage and an amount of gain provided by the variable gain amplification stage to maintain any of various noise, efficiency, and/or linearity requirements of the amplifier system.
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公开(公告)号：US20190190623A1
公开(公告)日：2019-06-20
申请号：US16282621
申请日：2019-02-22
发明人： Adrian John Bergsma , Peihua Ye , Thomas Obkircher , Peter Harris Robert Popplewell , Gregory Edward Babcock , William J. Domino
IPC分类号： H04B15/00 , H04B1/18 , H04B1/44 , H03G3/34 , H03F3/72 , H03F1/56 , H03G3/30 , H04B1/04 , H03F3/19 , H04B1/40
CPC分类号： H04B15/00 , H03F1/56 , H03F3/19 , H03F3/72 , H03F2200/387 , H03F2200/451 , H03F2203/7212 , H03G3/3042 , H03G3/348 , H03G2201/106 , H04B1/0458 , H04B1/18 , H04B1/40 , H04B1/44
摘要： Systems and methods are provided for reducing the effects of an impedance mismatch between a communications system and a shared communications medium. A communication system, such as a transceiver within a cable modem, switches between various operating modes including a transmit mode, a receive mode, and a standby mode. The standby mode may be used while the transceiver is in an idle state between modes, such as while changing an amplifier gain states in between transmissions. While transitioning between modes, the impedance presented by the communications system can temporarily fluctuate causing unwanted signal reflections to propagate out of the communications system and on to the shared medium. Circuitry within the communications system, such as transmission circuitry including an adjustable attenuator, may be placed into a hybrid attenuation-isolation mode during the transition causing the magnitude of any unwanted signal reflections to be attenuated and reducing the impact on the shared medium.
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公开(公告)号：US10554188B2
公开(公告)日：2020-02-04
申请号：US15808372
申请日：2017-11-09
发明人： Adrian John Bergsma , Thomas Obkircher , Peihua Ye , Bang Li Liang , Peter Harris Robert Popplewell , William J. Domino
摘要： Systems and methods for suppressing transient outputs from an amplifier system are provided. An amplifier having a plurality of bias levels may be controlled to initiate a change in the level of a bias signal provided to the amplifier. The level of the bias signal is ramped from an initial bias level to a final bias level over numerous steps. The steps include at least one step in which the level of the bias signal is between the initial bias level and the final bias level. An amplifier system having multiple stages may be controlled to enable each stage and selectively couple each stage in a sequence that couples an output stage to an output terminal at the completion of the sequence.
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公开(公告)号：US20180138990A1
公开(公告)日：2018-05-17
申请号：US15808358
申请日：2017-11-09
发明人： Adrian John Bergsma , Peihua Ye , Thomas Obkircher , Peter Harris Robert Popplewell , Gregory Edward Babcock , William J. Domino
CPC分类号： H04B15/00 , H03F1/56 , H03F3/19 , H03F3/72 , H03F2200/387 , H03F2200/451 , H03F2203/7212 , H03G3/3042 , H03G3/348 , H03G2201/106 , H04B1/0458 , H04B1/18 , H04B1/40 , H04B1/44
摘要： Systems and methods are provided for reducing the effects of an impedance mismatch between a communications system and a shared communications medium. A communication system, such as a transceiver within a cable modem, switches between various operating modes including a transmit mode, a receive mode, and a standby mode. The standby mode may be used while the transceiver is in an idle state between modes, such as while changing an amplifier gain states in between transmissions. While transitioning between modes, the impedance presented by the communications system can temporarily fluctuate causing unwanted signal reflections to propagate out of the communications system and on to the shared medium. Circuitry within the communications system, such as transmission circuitry including an adjustable attenuator, may be placed into a hybrid attenuation-isolation mode during the transition causing the magnitude of any unwanted signal reflections to be attenuated and reducing the impact on the shared medium.
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公开(公告)号：US20180138878A1
公开(公告)日：2018-05-17
申请号：US15808341
申请日：2017-11-09
CPC分类号： H03G3/30 , H03F1/0205 , H03F1/56 , H03F3/195 , H03F3/45475 , H03F2200/09 , H03F2200/294 , H03F2200/387 , H03F2200/451 , H03G1/0088 , H03G3/3042 , H03G2201/103 , H03G2201/106
摘要： Amplifier systems and methods are provided that include a fixed gain amplification stage coupled to an adjustable attenuation stage further coupled to a variable gain amplification stage. A controller controls an amount of attenuation provided by the adjustable attenuation stage and an amount of gain provided by the variable gain amplification stage to maintain any of various noise, efficiency, and/or linearity requirements of the amplifier system.
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公开(公告)号：US20190386624A1
公开(公告)日：2019-12-19
申请号：US16551955
申请日：2019-08-27
发明人： Peihua Ye , Patrick Marcus Naraine , Adrian John Bergsma , Peter Harris Robert Popplewell , Thomas Obkircher
摘要： Aspects and examples described herein provide a variable gain amplifier circuit and assembly. In one example, a variable gain amplifier circuit includes a signal input, a signal output, and a variable gain amplifier including a plurality of unit cell groups coupled between the signal input and the signal output, the variable gain amplifier configured to provide an adjustable gain to a signal received at the signal input during each of a plurality of amplify modes of the variable gain amplifier, each of the plurality of amplify modes corresponding to at least one unit cell group of the plurality of unit cell groups. A bypass path including a fixed attenuator is coupled in parallel with the variable gain amplifier between the signal input and the signal output to selectively couple the signal input to the signal output through the fixed attenuator during a bypass mode.
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公开(公告)号：US10396737B2
公开(公告)日：2019-08-27
申请号：US15808341
申请日：2017-11-09
摘要： Amplifier systems and methods are provided that include a fixed gain amplification stage coupled to an adjustable attenuation stage further coupled to a variable gain amplification stage. A controller controls an amount of attenuation provided by the adjustable attenuation stage and an amount of gain provided by the variable gain amplification stage to maintain any of various noise, efficiency, and/or linearity requirements of the amplifier system.
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公开(公告)号：US10340861B2
公开(公告)日：2019-07-02
申请号：US15782032
申请日：2017-10-12
摘要： Apparatus and methods for low noise amplifiers (LNAs) are provided herein. In certain configurations, an LNA includes a gain stage and a bypass stage electrically connected in parallel with one another between an input and an output. The bypass stage and the gain stage are selectively activated based on a mode of the LNA. For example, the gain stage provides inverting amplification to an input signal received at the input in a gain mode. Additionally, the bypass stage provides a low gain path from the input to the output in a bypass mode. Additionally, the bypass stage includes a balun that provides inversion to the bypass stage such that a phase delay through the bypass stage is similar to a phase delay of the gain stage.
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