Amplifiers – With distributed parameter-type coupling means – Distributed amplifier
Patent
1994-06-03
1996-01-16
Mullins, James B.
Amplifiers
With distributed parameter-type coupling means
Distributed amplifier
330277, 330286, 330295, H03F 360
Patent
active
054851181
ABSTRACT:
An amplifier extracts the maximum power from a plurality of identical three-terminal electronic amplifying devices, herein coined "cells," by additively combining their power contributions. The amplifier, herein coined a "non-uniformly distributed power amplifier," is a distributed amplifying circuit in which the transmission line impedances between adjacent electronic amplifying devices varies throughout the distribution in a prescribed manner so as to optimize the power output and/or amplifying efficiency of the distribution. The distribution may be constructed in one, two, or three dimensions but will always produce an overall mid-band power gain which is equivalent to the sum of the gains of the devices contained in the distribution of an overall power output which is equal to the number of devices times the power contribution of a single contributing device. Regardless of the amplifier's dimensions, microwave input power will be disbursed throughout the amplifier by an array of transmission lines of varying characteristic impedance which interconnects the input terminals of nearest neighbor cells. A similar array of transmission lines having a mirror-image topology interconnect the outputs of nearest neighbor cells to produce an output port. The output end (or outbound edges of a rectangular distribution, or outbound surfaces of a three-dimensional array) of the input array terminated in a resistor to absorb incident signals. However the output transmission line array requires no resistive terminations other than the intended load which will be attached to the output port.
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Massachusetts Institute of Technology
Mullins James B.
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