Negative feedback amplifiers including directional couplers

Details Negative feedback amplifiers including directional couplers Negative feedback amplifiers including directional couplers

1982-06-21

1984-07-17

Mullins, James B.

Amplifiers

With semiconductor amplifying device

Including distributed parameter-type coupling

330 53, 330293, H03F 360

Patent

active

044608756

ABSTRACT:
An intermediate frequency preamplifier of a microwave radio receiver includes an amplifier circuit having a negative feedback path including a directional coupler constituted by two transformers. One port of the directional coupler is terminated with a complex impedance, producing a controlled mis-match, which is adjustable to optimize the input return loss of the amplifier without changing the noise figure of the preamplifier. The amplifier circuit has a low impedance output constituted by a common-collector transistor so that the signal reflected back into the directional coupler by the mis-match does not significantly affect the output of the amplifier.

REFERENCES:
patent: 3066264 (1962-11-01), Goetter
patent: 3371284 (1968-02-01), Engelbrecht
patent: 3426298 (1969-02-01), Sontheimer et al.
patent: 3514711 (1970-05-01), Fjallbrant
patent: 3624536 (1971-11-01), Norton
patent: 3638134 (1972-01-01), Beurrier et al.
patent: 3891934 (1975-06-01), Norton et al.
patent: 4042887 (1977-08-01), Mead et al.

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