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    • 17. 发明授权
    • Tunable, distributed, voltage-controlled oscillator
    • 可调谐,分布式,压控振荡器
    • US06396359B1
    • 2002-05-28
    • US09548688
    • 2000-04-13
    • Seyed-Ali HajimiriHui Wu
    • Seyed-Ali HajimiriHui Wu
    • H03B518
    • H03B5/1852H03B5/26
    • Techniques and structures for tuning integrated, distributed voltage-controlled oscillators (DVCO's) across a wide microwave frequency range are disclosed. One type of DVCO implements a tuning circuit that includes a pair of interconnected amplifying transistors and a current source connected to the transistors, such that a differential voltage input to the circuit adjusts the current to each transistor and effectively adjusts the “electrical length” of one of the transmission lines on which the output frequency is oscillating. This, in turn, adjusts the time delay and thus frequency of the signal propagating on the lines across a wide frequency band. This technique is called “current-steering.” In a preferred embodiment, the tuning circuit is balanced with a complementary tuning circuit to effectively adjust the electrical length of the second transmission line in the oscillator. In another technique that provides for more coarse, but wider range, broadband frequency tuning, the time delay, and thus, frequency, of the DVCO is adjustable by varying the capacitive loading on the transmission lines, by introducing a coupling capacitor between the transmission lines and tuning the intrinsic capacitances of the gain transistors with a dc bias input.
    • 公开了在宽微波频率范围内调谐集成的分布式电压控制振荡器(DVCO)的技术和结构。 一种类型的DVCO实现了一种调谐电路,其包括一对互连的放大晶体管和连接到晶体管的电流源,使得输入到电路的差分电压调节到每个晶体管的电流并且有效地调整一个的“电长度” 的输出频率摆动的传输线。 这又调整了在宽频带上在线路上传播的信号的时间延迟和频率。 这种技术被称为“电流转向”。 在优选实施例中,调谐电路与互补调谐电路平衡,以有效地调节振荡器中第二传输线的电长度。 在提供更粗糙但更宽范围的宽带频率调谐的另一种技术中,通过在传输线之间引入耦合电容器来改变传输线路上的容性负载,可以调节DVCO的时间延迟以及因此的频率 并用直流偏置输入调节增益晶体管的固有电容。
    • 18. 发明授权
    • Common gate with resistive feed-through low noise amplifier
    • 具有电阻馈通低噪声放大器的公共门
    • US07489194B2
    • 2009-02-10
    • US11633720
    • 2006-12-05
    • Seyed-Ali HajimiriXiang Guan
    • Seyed-Ali HajimiriXiang Guan
    • H03F3/16
    • H03F3/193H03F2200/294H03F2200/372
    • A radio-frequency amplifier is provided. The radio-frequency amplifier includes a transistor having an input terminal, an output terminal, a control terminal, and a transconductance gm. A series-connected feed-through resistance Rf and feed-through capacitance Cf is connected in parallel with the input terminal and the output terminal of the transistor. A load resistance RL is connected to the output terminal. The control terminal of the transistor is biased at a fixed voltage. Part of the transistor noise follows the looped path through the feed-through resistor instead of passing on to the load, which reduces the noise figure of the amplifier. The value of gm, Rf and RL are chosen in a way to keep the input impedance of the amplifier matched to a well-defined signal source impedance.
    • 提供射频放大器。 射频放大器包括具有输入端子,输出端子,控制端子和跨导gm的晶体管。 串联连接的馈通电阻Rf和馈通电容Cf与晶体管的输入端和输出端并联连接。 负载电阻RL连接到输出端子。 晶体管的控制端子被偏置在固定电压。 晶体管噪声的一部分遵循通过馈通电阻的环路,而不是传递到负载,这降低了放大器的噪声系数。 选择gm,Rf和RL的值,以保持放大器的输入阻抗与良好定义的信号源阻抗匹配。