| 摘要 |
There is disclosed an improved variable gain low-noise amplifier. The variable gain low-noise amplifier comprises: 1) an input transistor having a first ground terminal coupled to ground and an input terminal coupled to an input signal; 2) N output transistor, each of the N output transistors having a first output terminal coupled to a second output terminal of the input transistor; 3) N switches, each of the N switches turning a corresponding one of the N output transistors ON and OFF by selectively coupling an input terminal of the corresponding one of the N output transistors to one of: 1) an enabling voltage and 2) a disabling voltage; and 4) an inductor comprising a first inductor terminal coupled to a supply voltage, a second inductor terminal coupled to a second output terminal of a first one of the N output transistors, and N-1 tap points intermediate the first and second inductor terminals, each of the N-1 tap points coupled to a second output terminal of a corresponding one of the remaining N-1 output transistors.
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