Gain-tilt amplifier

Amplifiers – With semiconductor amplifying device – Including field effect transistor

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Details

330282, 330294, H03F 134

Patent

active

050517058

ABSTRACT:
A feedback circuit couples a base amplifier output to the amplifier input for feeding back a portion of an amplified input signal. The feedback circuit includes an inductor coupled in series with a variable resistance. The variable feedback resistance is provided by a feedback FET having a gate for receiving a control signal for varying the resistance between the source and drain. The gain of the base amplifier is determined over the predetermined frequency range by the combined impedance of the inductor and resistance. The base amplifier is a field-effect transistor (FET). The feedback inductance is taken from a portion of a coil coupling the drain of the base FET with an output terminal.

REFERENCES:
patent: 4612514 (1986-09-01), Shigaki et al.
Pacific Monolithics, Gallium Arsenide Systems, Data Sheet, "2-6 and 2-8 GHz MMIC Amplifiers In Drop-In Packages", 4 pages.
Pacific Monolithics Invention Disclosure Form dated 1/12/89, 13 pages.

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