公开(公告)号：US20210399121A1

公开(公告)日：2021-12-23

申请号：US17353665

申请日：2021-06-21

Applicant: The Regents of the University of California

Inventor： Brian Romanczyk ,  Umesh K. Mishra ,  Pawana Shrestha ,  Matthew Guidry ,  James Buckwalter ,  Stacia Keller ,  Rohit Reddy Karnaty

IPC: H01L29/778 ,  H01L29/10 ,  H01L29/205 ,  H01L29/423 ,  H01L29/66 ,  H01L29/267

Abstract: Derivative cancellation techniques have been used to linearize transistors using multiple discreet devices. However at frequencies approaching and in the mm-wave regime the use of individual devices no longer works due to the parasitics associated with combining the devices. In this invention device structures are described which apply the derivative cancellation technique in a single device thus removing the detrimental impact of combining. In one example, an N-polar transistor structure includes a channel; a cap structure comprising a plurality of cap layers on or above the channel; a source contact and a drain contact to the channel; and a castellated, stepped, or varying pattern formed in the cap layers so that gate metal deposited on the pattern forms at least two different threshold voltages and current combines in the ohmic region with essentially zero parasitic inductance.

公开(公告)号：US09929466B2

公开(公告)日：2018-03-27

申请号：US14775556

申请日：2014-03-13

Applicant: The Regents of the University of California

Inventor： Arpit K. Gupta ,  James Buckwalter

IPC: G01S5/02 ,  H01Q3/26 ,  H04W40/06 ,  H01Q3/42 ,  H01Q3/34

CPC classification number: H01Q3/2652 ,  H01Q3/2605 ,  H01Q3/34 ,  H01Q3/42 ,  H04W40/06

Abstract: Methods and apparatus, including computer program products are provided for self-steering antennas. In one aspect, there is a method. The method may include receiving, at a plurality of antennas, phase shifted versions of a signal. The method may further include determining a phase relationship between the phase shifted versions of the signal. Based on the determined phase relationship, the method may include adjusting a phase of a first local oscillator to remove a phase difference between the phase shifted versions of the signal to change the phase shifted versions of the signal to being in-phase versions of the signal. The method may further include combining the in-phase versions of the signal to steer a beam to a transmitter.

公开(公告)号：US20180040649A1

公开(公告)日：2018-02-08

申请号：US15556542

申请日：2016-03-10

Applicant: The Regents of the University of California

Inventor： Shadi A. Dayeh ,  Yun Goo Ro ,  Namseok Park ,  Atsunori Tanaka ,  Siarhei Vishniakou ,  Ahmed Youssef ,  James Buckwalter ,  Cooper Levy

IPC: H01L27/142 ,  A61B5/00 ,  B81C1/00 ,  H01L31/042

CPC classification number: H01L27/142 ,  A61B5/0402 ,  A61B5/0476 ,  A61B5/0488 ,  A61B5/6802 ,  A61B2560/0214 ,  A61B2562/028 ,  A61B2562/125 ,  A61B2562/164 ,  B81B2201/0214 ,  B81C1/00238 ,  B81C2203/0792 ,  H01L31/035227 ,  H01L31/035281 ,  H01L31/042 ,  H01L31/047

Abstract: Methods and devices that monolithically integrate thin film elements/devices, e.g., environmental sensors, batteries and biosensors, with high performance integrated circuits, i.e., integrated circuits formed in a high quality device layer. Preferred embodiments further monolithically integrate a solar cell array. Preferred embodiments provide pin-size and integrated solar powered wearable electronic, ionic, molecular, radiation, etc. sensors and circuits.

公开(公告)号：US09160286B2

公开(公告)日：2015-10-13

申请号：US14356677

申请日：2012-11-09

Applicant: The Regents of the University of California

Inventor： Nader Kalantari ,  James Buckwalter

IPC: H03F3/19 ,  H03F3/21 ,  H03F1/34

CPC classification number: H03F3/19 ,  H03F1/34 ,  H03F3/21 ,  H03F2200/138 ,  H03F2200/451

Abstract: A radio frequency power amplifier amplifies an input signal at an input port, and produces an output signal at an output port. The power amplifier may include one or more amplifier stages. An amplifier stage may include an active device, and a feedback network. The feedback network may include one or more reactive elements configured to resonate at a predetermined frequency, to provide an impedance match at the input to the amplifier stage, and to provide an impedance match at the output of the amplifier stage. In some example implementations, the input and output impedance matching is caused by biasing the active device to produce a transconductance at least one of equal to or greater than a critical transconductance.

Abstract translation: 射频功率放大器放大输入端口的输入信号，并在输出端口产生输出信号。 功率放大器可以包括一个或多个放大器级。 放大器级可以包括有源器件和反馈网络。 反馈网络可以包括配置成以预定频率谐振的一个或多个无功元件，以在放大器级的输入处提供阻抗匹配，并且在放大器级的输出处提供阻抗匹配。 在一些示例实现中，通过偏置有源器件以产生等于或大于临界跨导中的至少一个的跨导而引起输入和输出阻抗匹配。

公开(公告)号：US20240089001A1

公开(公告)日：2024-03-14

申请号：US18466608

申请日：2023-09-13

Applicant: The Regents of the University of California

Inventor： Clint Schow ,  James Buckwalter ,  Aaron Maharry ,  Hector Andrade ,  Larry Coldren

IPC: H04B10/40 ,  G02F1/01 ,  G02F1/21 ,  G02F3/00 ,  H04B10/516 ,  H04B10/61 ,  H04J14/02

CPC classification number: H04B10/40 ,  G02F1/0136 ,  G02F1/212 ,  G02F3/00 ,  H04B10/516 ,  H04B10/61 ,  H04J14/02 ,  G02F2201/02 ,  G02F2203/50

Abstract: Systems and methods for fabricating an optoelectronic transceiver with a tunable traveling wave modulator and an analog coherent receiver to transmit and receive wavelength-multiplexed optical signals in accordance with embodiments of the invention are disclosed. In one embodiment, a network switch includes a plurality of ports configured to transmit and receive optical signals and electrical current signals, a plurality of optoelectronic transmitters using a traveling wave modulator and driver biasing, and a plurality of analog coherent receivers.

公开(公告)号：US11056517B2

公开(公告)日：2021-07-06

申请号：US15556542

申请日：2016-03-10

Applicant: The Regents of the University of California

Inventor： Shadi A. Dayeh ,  Yun Goo Ro ,  Namseok Park ,  Atsunori Tanaka ,  Siarhei Vishniakou ,  Ahmed Youssef ,  James Buckwalter ,  Cooper Levy

IPC: B81C1/00 ,  H01L31/0352 ,  H01L31/047 ,  H01L31/042 ,  H01L27/142 ,  A61B5/00 ,  A61B5/318 ,  A61B5/369 ,  A61B5/389

Abstract: Methods and devices that monolithically integrate thin film elements/devices, e.g., environmental sensors, batteries and biosensors, with high performance integrated circuits, i.e., integrated circuits formed in a high quality device layer. Preferred embodiments further monolithically integrate a solar cell array. Preferred embodiments provide pin-size and integrated solar powered wearable electronic, ionic, molecular, radiation, etc. sensors and circuits.

公开(公告)号：US20160036125A1

公开(公告)日：2016-02-04

申请号：US14775556

申请日：2014-03-13

Applicant: THE REGENTS OF THE UNIVERSITY OF CALIFORNIA

Inventor： Arpit K. Gupta ,  James Buckwalter

IPC: H01Q3/26 ,  H01Q3/34 ,  H04W40/06

CPC classification number: H01Q3/2652 ,  H01Q3/2605 ,  H01Q3/34 ,  H01Q3/42 ,  H04W40/06

Abstract: Methods and apparatus, including computer program products are provided for self-steering antennas. In one aspect, there is a method. The method may include receiving, at a plurality of antennas, phase shifted versions of a signal. The method may further include determining a phase relationship between the phase shifted versions of the signal. Based on the determined phase relationship, the method may include adjusting a phase of a first local oscillator to remove a phase difference between the phase shifted versions of the signal to change the phase shifted versions of the signal to being in-phase versions of the signal. The method may further include combining the in-phase versions of the signal to steer a beam to a transmitter.

Abstract translation: 为自转导天线提供了包括计算机程序产品的方法和设备。 一方面，有一种方法。 该方法可以包括在多个天线处接收信号的相移版本。 该方法还可以包括确定信号的相移版本之间的相位关系。 基于确定的相位关系，该方法可以包括调整第一本地振荡器的相位以消除信号的相移版本之间的相位差，以将信号的相移版本改变为信号的同相版本 。 该方法还可以包括组合信号的同相版本以将光束转向发射器。

公开(公告)号：US20140320212A1

公开(公告)日：2014-10-30

申请号：US14356677

申请日：2012-11-09

Applicant: The Regents of the University of California

Inventor： Nader Kalantari ,  James Buckwalter

IPC: H03F3/19 ,  H03F3/21

CPC classification number: H03F3/19 ,  H03F1/34 ,  H03F3/21 ,  H03F2200/138 ,  H03F2200/451

Abstract: A radio frequency power amplifier amplifies an input signal at an input port, and produces an output signal at an output port. The power amplifier may include one or more amplifier stages. An amplifier stage may include an active device, and a feedback network. The feedback network may include one or more reactive elements configured to resonate at a predetermined frequency, to provide an impedance match at the input to the amplifier stage, and to provide an impedance match at the output of the amplifier stage. In some example implementations, the input and output impedance matching is caused by biasing the active device to produce a transconductance at least one of equal to or greater than a critical transconductance.

Abstract translation: 射频功率放大器放大输入端口的输入信号，并在输出端口产生输出信号。 功率放大器可以包括一个或多个放大器级。 放大器级可以包括有源器件和反馈网络。 反馈网络可以包括配置成以预定频率谐振的一个或多个无功元件，以在放大器级的输入处提供阻抗匹配，并且在放大器级的输出处提供阻抗匹配。 在一些示例实现中，通过偏置有源器件以产生等于或大于临界跨导中的至少一个的跨导来引起输入和输出阻抗匹配。