High gain, impedance matching low noise RF amplifier circuit

Amplifiers – With plural amplifier channels – Redundant amplifier circuits

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330302, H03F 368, H03F 304

Patent

active

061278874

ABSTRACT:
A low noise amplifier circuit provides high gain and an input impedance matching a source output impedance by combining two amplifiers having different operational characteristics in parallel. The amplifier circuit includes a first amplifier having an input impedance matching a source and a gain less than a system requirement and a second amplifier having a gain meeting the system requirement and an input impedance substantially higher than the input impedance of the first amplifier, the second amplifier being connected in parallel to the first amplifier. The first amplifier includes an input and an output and the second amplifier includes an input and an output, the input to the first amplifier and the input to the second amplifier being connected to the source. A summer is provided for combining an output signal from the first amplifier with an output of the second amplifier. The input impedance of the first amplifier and the input impedance of the second amplifier provide an effective circuit impedance equal to an output impedance of the source. The first and the second amplifier include low noise RF amplifiers. Thus, the first and second amplifier provide an effective gain meeting the system requirement and an effective input impedance matching an output impedance of the source.

REFERENCES:
patent: 3585516 (1971-06-01), Ricagni
patent: 3675145 (1972-07-01), Beurrier
patent: 3784932 (1974-01-01), Wisherd
patent: 3868584 (1975-02-01), Beurrier
patent: 5548246 (1996-08-01), Yamamoto et al.

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