Output level automatic control apparatus

Details Output level automatic control apparatus Output level automatic control apparatus

1994-12-22

1996-05-07

Mullins, James B.

Amplifiers

With semiconductor amplifying device

Including gain control means

330144, 330279, 330284, 455126, H03G 330

Patent

active

055150080

ABSTRACT:
An output level automatic control apparatus suitable for use to keep a transmitted output level of a radio system constant has an objective to prevent an output level above a specified value from being transmitted if an input level abruptly becomes a normal level from a break state, and to stabilize the output level with a simple configuration. The output level automatic control apparatus includes a main amplifier output level feed-back control loop extending from an output side of a main amplifier to a variable attenuator, which main amplifier output level feed-back control loop includes an output level detecting means, a reference value setting means, and a control means controlling the variable attenuator on the basis of a result obtained by comparing a detected output of the main amplifier with a reference value. Said main amplifier output level feed-back loop becomes negative feed-back when the output level of said main amplifier is in the neighborhood of a set value, and becomes positive or zero feed-back when the output level of the main amplifier is smaller than a second set value that is smaller than said set value.

REFERENCES:
patent: 4499430 (1985-02-01), Fujii
patent: 4553105 (1985-11-01), Sasaki
patent: 4812908 (1989-03-01), Frequin

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