Amplifiers – With semiconductor amplifying device – Including gain control means
Patent
1981-06-24
1984-04-17
Mullins, James B.
Amplifiers
With semiconductor amplifying device
Including gain control means
330295, H03G 330
Patent
active
044437706
ABSTRACT:
An automatic level control circuit comprises a first transistor which receives a direct current output obtained by converting respectively output voltages of a pair of amplifiers by each rectifying circuit, through a first resistor to a base thereof; a second resistor connected between an emitter of said first transistor and the ground; a second transistor whose collector is connected to a collector of said first transistor and whose emitter is connected through a third resistor to a power source; a third transistor whose emitter and base are respectively connected to the base and collector of said transistor; and whose collector is gounded; fourth and fifth transistors having a multicollector structures having each base connected to the base of said third transistor and having collector of one connected to a collector of the other transistor each other; fourth and fifth resistors connected between emitters of said fourth and fifth transistors and said power source; sixth and seventh transistors whose bases are respectively connected to each of collectors of said fourth and fifth transistors; sixth and seventh resistors which are respectively connected between said power source and each of collectors of sixth and seventh transistors; eighth and ninth resistors which are respectively connected between each base and emitter of said sixth and seventh transistors; eighth and ninth transistors whose bases are respectively connected to each of emitters of said sixth and seventh transistors; and whose emitters are grounded; and each of input resistors connected to each of collectors of said eighth and ninth transistors to attain automatic leveling operation by utilizing saturated resistances of said eighth and ninth transistors.
Itobayashi Manabu
Ohtawa Hisao
Mitsubishi Denki & Kabushiki Kaisha
Mullins James B.
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