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发明公开
CN105103442A 具有经助推或经制推的源极退化电感的放大器 有权

具有经助推或经制推的源极退化电感的放大器
摘要：
公开了具有经助推或经制推的源极退化电感的放大器。在一示例性设计中，一种装置包括放大器电路(400)和反馈电路(450)。放大器电路(400)接收输入信号(RFin)并且提供输出信号(RFout)，并且包括源极退化电感器(432)。反馈电路(450)耦合在放大器电路的节点与源极退化电感器(432)之间。反馈电路(450)提供反馈以改变包括放大器电路和反馈电路的放大器的输入阻抗。反馈电路(450)可以是可编程的并且可以被启用以提供反馈或者被禁用以不提供反馈。替换地，反馈电路(450)可以一直被启用以提供反馈。在任一种情形中，反馈电路(450)可具有可变增益以为放大器提供可变输入阻抗。
摘要（英）：

Amplifiers with boosted or deboosted source degeneration inductance are disclosed. In an exemplary design, an apparatus includes an amplifier circuit (400) and a feedback circuit (450). The amplifier circuit (400) receives an input signal (RFin) and provides an output signal (RFout) and includes a source degeneration inductor (432). The feedback circuit (450) is coupled between a node of the amplifier circuit and the source degeneration inductor (432). The feedback circuit (450) provides feedback to vary an input impedance of an amplifier including the amplifier circuit and the feedback circuit. The feedback circuit (450) may be programmable and may be enabled to provide feedback or disabled to provide no feedback. Alternatively, the feedback circuit (450) may always be enabled to provide feedback. In either case, the feedback circuit (450) may have a variable gain to provide a variable input impedance for the amplifier.

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