Bandwidth control circuitry for radar i-f amplifier

Details Bandwidth control circuitry for radar i-f amplifier Bandwidth control circuitry for radar i-f amplifier

1980-10-29

1983-02-01

Mullins, James B.

Amplifiers

With semiconductor amplifying device

Including gain control means

330126, 330295, 330306, 330311, 455266, H03H 368, H03G 330

Patent

active

043718469

ABSTRACT:
A unidirectional current with i-f variations superimposed thereon is applied to the interconnected emitters of a pair of transistors, the collectors of which are coupled to a succeeding stage by a narrow-band filter and by a wide-band filter respectively. The unidirectional current with i-f variations is amplified by a selected one of the transistors and filtered accordingly, depending upon which of two polarities of potential is applied between the bases of the transistors.

REFERENCES:
patent: 2716161 (1955-08-01), Gray
patent: 3260952 (1966-07-01), Kaye et al.
patent: 3581222 (1971-05-01), Dunwoodie
patent: 3649847 (1972-03-01), Limberg
patent: 3684974 (1972-08-01), Solomon et al.
patent: 3742126 (1973-06-01), Altmanshofer
patent: 3872387 (1975-03-01), Banach
patent: 3875522 (1975-04-01), Hoefi
patent: 4041409 (1977-08-01), Kominami et al.
"RCA Primus-90 WXD Receiver-Transmitter MI-585161 Component Maintenance Manual IB8029066", Dec. 1, 1979, pp. 21-25, 147-148.

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