Jerrold Electronics Corporation

Other

Norman Everhart

Dieter Bruno Brauer

A broad-band radio-frequency amplifier is characterized by a gain which may be adjusted over a relatively large range, and which remains stable over the range of gain adjustments. The amplifier includes first and second transistor pairs each arranged in a cascode connection; a feedback capacitor connected across the output and input of each cascode pair; and inductance serially included at selected circuit points. Also disclosed is a hybrid circuit for efficiently implementing the amplifier.

Modular radio frequency amplifier having a gain variable by external

An improved overvoltage protection circuit for cascaded radio frequency signal distributing amplifiers interrupts a power transmission path in an open circuit mode responsive to an overrange input power potential, and is automatically reset to its quiescent operative condition when the overvoltage condition abates. AC energy is coupled by the instant arrangement at a reduced level while the fault condition persists, such that the driven load is continuously energized. In accordance with one aspect of the present invention, selective relatively essential ones of the distribution amplifiers, e.g. trunk amplifiers, can be maintained operative by a DC standby power supply during an AC line power hiatus. Correspondingly, other, less important amplifiers are automatically rendered inoperative during power faults to prevent excessive drain in the DC standby source.

Radio frequency distribution network standby power system with

An improved overvoltage protection circuit interrupts a power transmission path in an open circuit mode responsive to an overrange input power potential, and is automatically reset to its quiescent operative condition when the overvoltage condition abates. In accordance with various aspects of the present invention, AC energy is coupled by the instant arrangement at a reduced level while the fault condition persists, such that the driven load is continuously energized.

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Richboro, PA, United States of America

Norman Everhart