Amplifiers – With semiconductor amplifying device – Including plural amplifier channels
Patent
1990-03-01
1991-05-21
Mottola, Steven
Amplifiers
With semiconductor amplifying device
Including plural amplifier channels
330124R, H03P 368
Patent
active
050178881
ABSTRACT:
A broadband nonlinear drive control network for linear amplifiers with several amplifier channels has a first branch (Z1) with an adjustable amplitude limiter (A) connected to a signal source (S) through an impedance inverter (B), whereby an increasing impedance is produced at the signal source (S) when the limiter is activated. A variable resistor (C) is connected to the signal source (S) in a second branch (Z2). The resistor (C) begins to conduct only above an adjustable high frequency signal voltage. The amplitudes at the limiter (A) and at the resistor are tuned to each other so that the load impedance at the signal source (S) remains constant. Linear branch signal combinations provide the drive control voltages for the individual channels (K2 . . . Kn). A portion of the power output of the branch (Z1) directly drives the amplifier channel (K1).
REFERENCES:
patent: 4494084 (1985-01-01), Hughes
patent: 4780685 (1988-10-01), Ferguson
H. Chireix: High Power Outphasing Modulation Proc. I.R.E., V.23, No. 11 (Nov. 1935) pp. 1370-1392.
W. H. Doherty: "A New High Efficiency Power Amplifier for Modulated Waves", Proc. I.R.E. V. 24, No. 9 (Sep. 1936) pp. 1163-1182.
Fasse W. G.
Kane, Jr. D. H.
Messerschmitt-Boelkow-Blohm GmbH
Mottola Steven
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