Variable amplifier for RF input stage

Details Variable amplifier for RF input stage Variable amplifier for RF input stage

1976-06-19

1977-11-08

Mullins, James B.

Amplifiers

With semiconductor amplifying device

Including gain control means

330284, 330145, 330302, H03G 330

Patent

active

040577651

ABSTRACT:
A variable gain RF input amplifier having an improved cross modulation characteristic using a field effect transistor. About the first 10 db of signal attenuation is effected by an AGC voltage applied to the transistor, following which supplementary attenuation is provided by an increasing reverse bias applied to a PIN-diode in the RF signal input path to the transistor, the diode bias being derived from the source circuit of the transistor.

REFERENCES:
patent: 3428910 (1969-02-01), Webb
patent: 3525050 (1970-08-01), Wolf et al.
patent: 3624561 (1971-11-01), Tongue

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