Apparatus for amplifying an RF signal

Telecommunications – Receiver or analog modulated signal frequency converter – Local control of receiver operation

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455127, 330285, 330279, H03G 330

Patent

active

060497041

ABSTRACT:
According to the apparatus of the present disclosure, dual gate control and dual gain control uses variable voltages on the gates of first stage (302) and a second stage (304) to control the output power. In alternate embodiments, dual drain control is also employed using a variable voltage supply on the drains of the first stage (302) and the second stage (304). In particular, a level shifter circuit (421) is employed to convert a positive voltage gate control signal to negative voltage with respect to ground. Drain current limiting circuits (417, 419) are used to sample drain currents and generate gate voltages to maintain a desired current ratio between stages of a multi-stage amplifier. When dual drain control is also employed, a 1:1 ratio of drain control voltages is employed at low power levels, with a single drain control at higher power levels.

REFERENCES:
patent: 5029298 (1991-07-01), Chiba et al.
patent: 5250912 (1993-10-01), Fujita
patent: 5278517 (1994-01-01), Fujita
patent: 5311143 (1994-05-01), Soliday
patent: 5442322 (1995-08-01), Kornfeld et al.
patent: 5589796 (1996-12-01), Alberth, Jr. et al.
Landherr et al., Method and Apparatus for Amplifying a Signal, Attorney Docket No. CE01603R, U.S.S.N. 08/890,819, filed Jul. 11, 1997.

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