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    • 9. 发明授权
    • Systems and methods providing multi-path low noise amplifiers with seamless switching
    • 提供无缝切换的多路径低噪声放大器的系统和方法
    • US08351887B2
    • 2013-01-08
    • US12632648
    • 2009-12-07
    • Jan-Michael Stevenson
    • Jan-Michael Stevenson
    • H04B7/00
    • H03F1/0277H03F1/0261H03F3/195H03F3/68H03F3/72H03F2200/294H03F2200/336H03F2200/375H03F2200/411H03F2200/432H03F2200/451H03G3/3068
    • Systems and methods which provide a multimode tuner architecture implementing direct frequency conversion are shown. Embodiments provide a highly integrated configuration wherein low noise amplifier, tuner, analog and digital channel filter, and analog demodulator functionality are provided in a single integrated circuit. A LNA of embodiments implements a multi-path configuration with seamless switching to provide desired gain control while meeting noise and linearity design parameters. Embodiments of the invention implement in-phase and quadrature (IQ) equalization and a multimode channelization filter architecture to facilitate the use of direct frequency conversion. Embodiments implement spur avoidance techniques for improving tuner system operation and output using a clock signal generation architecture in which a system clock, sampling clock frequencies, local oscillator (LO) reference clock frequencies, and/or the like are dynamically movable.
    • 示出了提供实现直接频率转换的多模调谐器架构的系统和方法。 实施例提供高度集成的配置,其中在单个集成电路中提供低噪声放大器,调谐器,模拟和数字信道滤波器以及模拟解调器功能。 实施例的LNA实现具有无缝切换的多路径配置,以在满足噪声和线性设计参数的同时提供期望的增益控制。 本发明的实施例实现了同相和正交(IQ)均衡和多模信道化滤波器架构,以便于直接频率转换的使用。 实施例实现了使用其中系统时钟,采样时钟频率,本地振荡器(LO)参考时钟频率等等是可动态移动的时钟信号生成架构来改进调谐器系统操作和输出的杂散避免技术。
    • 10. 发明授权
    • High-speed multi-type substrate analog to digital converter
    • 高速多类型基板模数转换器
    • US08279101B1
    • 2012-10-02
    • US12944563
    • 2010-11-11
    • Jan-Michael Stevenson
    • Jan-Michael Stevenson
    • H03M1/12
    • H03M1/0827H03M1/1245
    • High conversion rates are achieved in an analog to digital converter by tailoring the substrate type to specific operational elements of the converter. Embodiments place sample and hold processing circuitry on a substrate type having properties that allow for faster processing at high sampling/clock frequencies. Other operational elements of the converter are constructed on at least one other substrate type in keeping with the remainder of the circuitry for which the converter is being implemented. The sample and hold substrate may be implemented on any material which is capable of faster processing, such as silicon germanium, gallium arsenide, silicon bipolar, BiCMOS, and the like. Other portions may be implemented on a more CMOS substrate. Such systems and methods are able to implement analog-to digital conversion for broadband signals at high speeds without the need for extensive timing compensation, while also avoiding problems due to noise from further digital processing circuitry.
    • 通过将基板类型调整到转换器的特定操作元件,可以在模数转换器中实现高转换率。 实施例将采样和保持处理电路放置在具有允许在高采样/时钟频率下更快处理的特性的衬底类型上。 转换器的其它操作元件构造在至少一种其他衬底类型上,以保持正在实现转换器的电路的其余部分。 样品和保持基板可以在能够更快处理的任何材料上实现,例如硅锗,砷化镓,双极硅,BiCMOS等。 其他部分可以在更多的CMOS衬底上实现。 这样的系统和方法能够以高速实现宽带信号的模数转换,而不需要广泛的定时补偿,同时还避免了由于来自其他数字处理电路的噪声引起的问题。