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Patent Agency Ranking
公开(公告)号：US10998863B2
公开(公告)日：2021-05-04
申请号：US16133282
申请日：2018-09-17
Applicant: Analog Devices, Inc.
Inventor： Christopher John Day
IPC: H03F3/45 , H03F1/32 , H03F3/213 , H03F3/24 , H03F3/195 , H03F1/22 , H03M1/00 , H03M1/06 , H03M1/18 , H04B1/04
Abstract: Techniques for monitoring a distortion signal of a power amplifier circuit, where the output of a distortion monitoring circuit includes little or no fundamental signal and closely represents the actual distortion of the amplifier circuit of a wired communications system. The power amplifier circuit can generate a distortion feedback signal that does not affect the power amplifier's output power capability, e.g., no inherent loss in the fundamental output of the amplifier. That is, using a distortion monitor circuit, the power amplifier circuit can resolve a distortion feedback signal from the intended output signal of the output power amplifier circuit.
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公开(公告)号：US10389312B2
公开(公告)日：2019-08-20
申请号：US15879947
申请日：2018-01-25
Applicant: Analog Devices, Inc.
Inventor： Christopher John Day
Abstract: A power amplifier circuit for broadband data communication over a path in a communication network can reduce or avoid gain compression, provide low distortion amplification performance, and can accommodate a wider input signal amplitude range. A dynamic variable bias current circuit can be coupled to a common emitter bias node of a differential pair of transistors to provide a dynamic variable bias current thereto as a function of an input signal amplitude of an input signal. Bias current is increased when input signal amplitude exceeds a threshold voltage established by an offset or level-shifting circuit. The frequency response of the bias current circuit can track the frequency content of the input signal. A delay in the signal path to the differential pair can phase-align the bias current to the amplification by the differential pair. A dynamic variable supply voltage can be based on an envelope of the input signal.
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公开(公告)号：US20240282848A1
公开(公告)日：2024-08-22
申请号：US18560066
申请日：2021-12-08
Applicant: Analog Devices, Inc.
Inventor： James G. Fiorenza , Christopher John Day , Guanghai Ding , Daniel Piedra
IPC: H01L29/778 , H01L29/20 , H01L29/40 , H03K17/687
CPC classification number: H01L29/7786 , H01L29/2003 , H01L29/407 , H03K17/687
Abstract: A semiconductor device including a transistor having a threshold voltage for switching the transistor from a first conductive state to a second conductive state. The transistor includes a first region formed by a first compound semiconductor material and a second region formed by a second compound semiconductor material, where the second region overlying the first region and forming a two-dimensional electron gas (2DEG) at a junction with the first region. The transistor further includes a buried field plate disposed proximate to the first region so that the 2DEG is interposed between the buried field plate and the second region. The semiconductor device further includes a control circuit configured to adjust the threshold voltage of the transistor by providing a bias voltage to the buried field plate responsive to an input signal received at the transistor.
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公开(公告)号：US20190115876A1
公开(公告)日：2019-04-18
申请号：US16133282
申请日：2018-09-17
Applicant: Analog Devices, Inc.
Inventor： Christopher John Day
Abstract: Techniques for monitoring a distortion signal of a power amplifier circuit, where the output of a distortion monitoring circuit includes little or no fundamental signal and closely represents the actual distortion of the amplifier circuit of a wired communications system. The power amplifier circuit can generate a distortion feedback signal that does not affect the power amplifier's output power capability, e.g., no inherent loss in the fundamental output of the amplifier. That is, using a distortion monitor circuit, the power amplifier circuit can resolve a distortion feedback signal from the intended output signal of the output power amplifier circuit.
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公开(公告)号：US20180212573A1
公开(公告)日：2018-07-26
申请号：US15879947
申请日：2018-01-25
Applicant: Analog Devices, Inc.
Inventor： Christopher John Day
CPC classification number: H03F1/3211 , H03F1/0266 , H03F3/19 , H03F3/45085 , H03F3/45179 , H03F2200/102 , H03F2203/45112 , H03F2203/45244 , H03F2203/45392 , H03F2203/45454 , H04L25/085
Abstract: A power amplifier circuit for broadband data communication over a path in a communication network can reduce or avoid gain compression, provide low distortion amplification performance, and can accommodate a wider input signal amplitude range. A dynamic variable bias current circuit can be coupled to a common emitter bias node of a differential pair of transistors to provide a dynamic variable bias current thereto as a function of an input signal amplitude of an input signal. Bias current is increased when input signal amplitude exceeds a threshold voltage established by an offset or level-shifting circuit. The frequency response of the bias current circuit can track the frequency content of the input signal. A delay in the signal path to the differential pair can phase-align the bias current to the amplification by the differential pair. A dynamic variable supply voltage can be based on an envelope of the input signal.
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