| 摘要 |
A band-blocking filter for attenuating an unwanted frequency component in a signal having a plurality of frequency components is disclosed. The band-blocking filter includes an input port, a cancellation signal generator, and a combining circuit. An input signal having the plurality of frequency components including a first frequency component at a frequency of fb characterized by an amplitude, A, and phase and a second frequency component having a frequency of fg is received on the input port. The cancellation signal generator generates a cancellation signal having a frequency of fb and an amplitude and phase determined by the first frequency component that is applied to a combining circuit that combines the cancellation signal with the input signal to generate an output signal that includes the second frequency component and a residual signal at frequency fb having an amplitude less than A.
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