Telecommunications – Transmitter and receiver at separate stations – Single message via plural carrier wave transmission
Patent
1988-09-14
1989-12-05
Brigance, Gerald
Telecommunications
Transmitter and receiver at separate stations
Single message via plural carrier wave transmission
455 69, H04B 702, H04B 1500
Patent
active
048857980
ABSTRACT:
In some applications of power amplifiers, a prescribed or given amount of distortion is permissible under many operational conditions, as long as lesser amounts of distortion are available upon command. It has been ascertained as a part of the present invention that, by reducing the bias current in one or more of the output stages of a power amplifier, acceptable distortion specifications can be maintained under conditions of low power consumption and low output power requirements while retaining the ability to have more demanding linearity requirement specifications by increasing the bias current to a more linear portion of the I-V (current-voltage) curve and optionally providing increased output signal power. The bias condition of reduced power results in a conservation of electrical power requirements, a reduction of heat and temperature problems within the amplifier enclosure and accordingly an increase in component life and circuit reliability. An environment where such an amplifier finds useful application is in a communication system having the potential for signal fading between transmitter and receiver wherein a potential solution is to increase signal power output from the transmitter in a signal fading condition.
REFERENCES:
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patent: 4547746 (1985-10-01), Erickson et al.
patent: 4602218 (1986-07-01), Vilmur et al.
patent: 4636741 (1987-01-01), Mitzlaff
Jinich Leon
Varian Karl R.
Brigance Gerald
Hamann H. Fredrick
Hjerpe Richard
Lutz Bruce C.
Rockwell International Corporation
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