Overdrive protection circuit for power line carrier systems and

Details Overdrive protection circuit for power line carrier systems and Overdrive protection circuit for power line carrier systems and

1976-01-30

1977-06-14

Griffin, Robert L.

325 62, 325362, 325404, 325410, H04B 116

Patent

active

040300340

ABSTRACT:
In previous power line carrier systems, the gain of a broadband frequency amplifier was controlled by a feedback loop that utilized the magnitude of a pilot frequency signal. When the amplifier was turned on or when the gain control loop was switched into the circuit, large magnitude signals in the broadband of frequencies tended to overdrive the amplifier. This condition caused the pilot frequency signal to be suppressed so that the gain of the amplifier was kept too high. As a result, the broadband signals were limited and distorted. The pilot frequency signal stayed suppressed so that the carrier system caused faulty operation. The invention provides an added feedback loop that controls the gain of the broadband frequency amplifier as a function of the broadband of frequency signals until the pilot frequency signal can control the gain. After the pilot frequency signal begins to control, the broadband frequency loop is rendered inoperative.

REFERENCES:
patent: 2757239 (1956-07-01), Patton
patent: 3449525 (1969-06-01), Berry et al.
patent: 3470480 (1969-09-01), Smart et al.

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