Active distributed signal injector

Details Active distributed signal injector Active distributed signal injector

1995-09-20

1997-08-05

Mullins, James B.

Amplifiers

With distributed parameter-type coupling means

Distributed amplifier

330286, H03F 360

Patent

active

056546700

ABSTRACT:
A circuit that injects an auxiliary signal into an existing signal path, thereby adding it to an existing main signal, while minimizing attenuation, distortion, or other perturbation to the main signal. The present invention provides for a active distributed signal injector that includes two transmission lines. An input port is coupled to the first transmission line for receiving the main signal, and a main output port is coupled to an output end of the first transmission line for outputting the main signal. The second transmission line is terminated at an output end and has an injected signal input port at an input end of the second transmission line. A plurality of high impedance amplifiers bridge between the transmission lines, and a plurality of inductors are coupled between each of the high impedance amplifiers. A plurality of transmission lines may be optionally employed in the second transmission line. Optionally, the termination used in the second transmission line may be replaced by a second output port that is used to output the injected signal.

REFERENCES:
patent: 3451004 (1969-06-01), Miller et al.
patent: 4797628 (1989-01-01), Gruchalla et al.

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