Amplifiers – With distributed parameter-type coupling means – Distributed amplifier
Patent
1988-03-23
1989-01-10
Mottola, Steven
Amplifiers
With distributed parameter-type coupling means
Distributed amplifier
330118, 330286, H03F 360, H03F 328
Patent
active
047976284
ABSTRACT:
The present invention provides a modified distributed amplifier which is capable of providing push-pull operation without the loading losses of conventional push-pull combining. The modified distributed amplifier comprises a distributed amplifier configuration and with signal inverting means, such as a wide bandwidth transmission line transformer, interconnected into both the input and output lines. The signal inverting means are most effectively placed at the electrical centers of the lines, but may be placed at any positions in the individual lines to produce optimum performance to specific applications. The separate segments of the distributed amplifier separated by the signal inverting means operate in opposed phase but the signals output to the load add in phase thus providing push-pull operation. Since only one reverse terminating resistor is required, the power normally lost due to the loading by the companion amplifier of a conventional push-pull combined distributed amplifier system is instead delivered to the output load, the use of this type of amplifier preserves the advantages of the distributed amplifier configuration while providing the superior performance of the push-pull configuration but without the losses normally incurred with conventional push-pull combining.
REFERENCES:
patent: 2018320 (1935-10-01), Roberts
patent: 2930986 (1960-03-01), Kobbe et al.
patent: 3571742 (1971-03-01), Wegenroth
patent: 4337439 (1982-06-01), Sosin
Gruchalla Michael E.
Koller David C.
Mottola Steven
Ojanen Karla
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