Integratable class AB output stage for low-frequency amplifiers

Details Integratable class AB output stage for low-frequency amplifiers Integratable class AB output stage for low-frequency amplifiers

1988-04-12

1989-03-21

Mottola, Steven

Amplifiers

With semiconductor amplifying device

Including push-pull amplifier

330267, 330268, H03F 326

Patent

active

048147230

ABSTRACT:
To obtain a constant quiescent current, high dynamics and high stability of a class AB output stage of low-frequency amplifiers, comprising an input transistor; a driving circuit comprising a current source, a first pair of driving transistors connected in series between the current source and the input transistor, a second pair of driving transistors mutually connected in series and driven by the first pair of driving transistors; as well as a pair of output transistors driven by the second pair of driving transistors, the driving circuit comprises a first resistor connected between the current source and the base of one of the first pair of driving transistors, a second resistor connected between the bases of the transistors of the first pair and a resistive network inserted in series between the transistors of the second driving pair. The resistive network is constituted by two resistive branches connected in parallel, the intermediate point of the first resistive branch being connected to the ground voltage and the intermediate terminal of the other resistive branch being connected to the stage output.

REFERENCES:
patent: 4176323 (1979-11-01), Odell
patent: 4471323 (1984-09-01), Trilling

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