Gain monitoring of distortion cancellation amplifiers in a feedf

Details Gain monitoring of distortion cancellation amplifiers in a feedf Gain monitoring of distortion cancellation amplifiers in a feedf

1988-12-29

1990-05-15

Mullins, James B.

Amplifiers

With amplifier condition indicating or testing means

330149, 330151, H03F 132

Patent

active

049261347

ABSTRACT:
A monitor signal injection system for a feedforward cancellation amplifier having at least one stage in which monitor signals having a constant relatively large amplitude are injected into, for example, a main amplifier. The monitor signals are used to measure the status of all individual components of the amplifier and are useful for fault detection and isolation. In addition, the monitor signals are cancelled in the output to a very low level and as a result, on-line monitoring can be performed without significant radiation of power from a load antenna.

REFERENCES:
patent: 3471798 (1969-10-01), Seidel
patent: 4517521 (1985-05-01), Preschutti et al.
patent: 4625178 (1986-11-01), Mannerstrom
patent: 4694258 (1987-09-01), Blumenkane et al.

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