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    • 71. 发明授权
    • Automatic phase alignment for high-bandwidth cartesian-feedback power amplifiers
    • 高带宽笛卡尔反馈功率放大器的自动相位对准
    • US07177366B1
    • 2007-02-13
    • US09947624
    • 2001-09-06
    • Joel L. DawsonThomas H. Lee
    • Joel L. DawsonThomas H. Lee
    • H04I27/00
    • H04L27/368H03F1/3247H03F1/3294H03F3/24H03F2200/336
    • In an automatic phase alignment circuit for a Cartesian feedback amplifier, the phase error is regularly monitored. In various implementations, this approach is used to provide true and continuous phase alignment. Based on a relationship between the up-converted and down-converted signals, another implementation of the invention provides phase-alignment for quadrature-phase components of a baseband signal by arithmetically combining the quadrature-phase components and the feedback components continuously and, in response, continuously phase-adjusting signals in the feed-forward signal path. Another aspect of the present invention is directed to an approach for calculating phase error for that is caused by DC-offset interference which, in turn, manifest at the outputs of many analog functional blocks.
    • 在用于笛卡尔反馈放大器的自动相位对准电路中,定期监视相位误差。 在各种实施方案中,该方法用于提供真实和连续的相位对准。 基于上转换信号和下变频信号之间的关系,本发明的另一实现方式通过连续地对正交相位分量和反馈分量进行算术组合来提供基带信号的正交相位分量的相位对准,作为响应 ,在前馈信号路径中连续地相位调整信号。 本发明的另一方面涉及一种用于计算由DC偏移干扰引起的相位误差的方法,其反过来表现为许多模拟功能块的输出。
    • 76. 发明授权
    • Phase detector with minimized phase detection error
    • US06340900B1
    • 2002-01-22
    • US08582045
    • 1996-01-02
    • Kevin S. DonnellyThomas H. LeeTsyr-Chyang Ho
    • Kevin S. DonnellyThomas H. LeeTsyr-Chyang Ho
    • H03K526
    • G01R25/00H03L7/085
    • A phase detector is described that includes a load circuit that presents both a high differential impedance and a low common mode impedance. The load circuit is coupled to (1) a power supply and (2) a first node and a second node. The first and second nodes form an output of the phase detector. A capacitive circuit has (1) a first capacitor coupled to the first node and ground and (2) a second capacitor coupled to the second node and ground. A first circuit is coupled to the first and second nodes for detecting a phase difference between a first signal and a second signal. A second circuit is coupled to the first and second nodes for detecting the phase difference between the first and second signals and for minimizing phase detection error of the first circuit such that the phase difference between the first and second signals can be detected with minimized phase detection error. Each of the first and second circuits receives the first and second signals and a reference signal. The second circuit is cross-coupled to the first circuit such that an error current generated by the second circuit cancels that generated by the first circuit such that the phase detector detects the phase difference between the first and second signals with minimized phase detection error.
    • 77. 发明授权
    • System and method for designing integrated circuits
    • 集成电路设计系统及方法
    • US06269277B1
    • 2001-07-31
    • US09123129
    • 1998-07-27
    • Maria del Mar HershensonStephen P. BoydThomas H. Lee
    • Maria del Mar HershensonStephen P. BoydThomas H. Lee
    • G06F1900
    • G06F17/5063
    • A system for designing and optimizing integrated circuits. Design objectives and constraints are described as posynomial functions of the design parameters. The circuit design problem is then expressed as a special form of optimization problem called geometric programming, to which very efficient global optimization methods are applied. The present invention can thereby efficiently determine globally optimal circuit designs, or globally optimal trade-offs among competing performance measures such as, for example for an operational amplifier (op-amp), power, open-loop gain, and bandwidth. The present invention therefore yields automated synthesis of globally optimal circuit designs for a given circuit topology library, directly from specifications.
    • 集成电路设计和优化系统。 设计目标和约束被描述为设计参数的函数式函数。 然后将电路设计问题表示为称为几何规划的特殊形式的优化问题,其中应用了非常有效的全局优化方法。 因此,本发明可以有效地确定全球最佳电路设计,或者在诸如运算放大器(运算放大器),功率,开环增益和带宽等竞争性能测量之间的全局最佳权衡。 因此,本发明可以直接从规范产生给定电路拓扑库的全局最佳电路设计的自动合成。
    • 79. 发明授权
    • Power supply independent temperature sensor
    • 电源独立温度传感器
    • US6157244A
    • 2000-12-05
    • US170335
    • 1998-10-13
    • Thomas H. LeeMark G. JohnsonJohn C. Holst
    • Thomas H. LeeMark G. JohnsonJohn C. Holst
    • G01K7/01G05F1/10
    • G01K7/01
    • A temperature sensor is fabricated in an integrated circuit in combination with another device such as a microprocessor using a fabrication technology that is suitable for fabricating the device. Operation of the temperature sensor is based on the bandgap physics of semiconductors using a bandgap reference circuit and an amplifier that generate two measurement voltages, a voltage that is temperature-dependent and a voltage that is temperature-independent. The temperature sensor includes a bandgap power supply circuit that supplies a power supply voltage that is very stable to drive the temperature sensor so that the temperature sensor generates an output signal that is essentially independent of the power supply voltage.
    • 温度传感器与集成电路结合使用适合于制造该器件的制造技术的另一个器件(如微处理器)制造。 温度传感器的操作基于使用带隙参考电路的半导体带隙物理学和产生两个测量电压的放大器,其是依赖于温度的电压和与温度无关的电压。 温度传感器包括带隙电源电路,其提供非常稳定的驱动温度传感器的电源电压,使得温度传感器产生基本上与电源电压无关的输出信号。