Patent ID: 6072376
Filing Date: 2000-06-06
Classification: H01P,H03F

Abstract:
A filter with a low-noise amplifier, comprising:two amplification circuits, each having an input side, an output side, an amplification element, a noise figure matching circuit connected to an input of said amplification element, and a further matching circuit connected to an output of said amplification element;a first 3-dB hybrid circuit connected to said input side of said two amplification circuits and including a first input terminal, a second input terminal, a first output terminal, and a second output terminal;a second 3-dB hybrid circuit connected to said output side of said two amplification circuits and including a first input terminal, a second input terminal, a first output terminal, and a second output terminal;a filter input terminal; anda filtering device connected between said filter input terminal and said first input terminal of said first 3-dB hybrid circuit;wherein said second input terminal of said first 3-dB hybrid circuit has a matched termination, said filter input terminal is operable to receive a signal and said second output terminal of said second 3-dB hybrid circuit is operable to output the signal, and said first output terminal of said second 3-dB hybrid circuit has a matched termination.