Amplifier stage with collector output

Details Amplifier stage with collector output Amplifier stage with collector output

1988-04-12

1989-10-31

Mottola, Steven

Amplifiers

With semiconductor amplifying device

Including push-pull amplifier

330265, 330267, H03F 326

Patent

active

048780324

ABSTRACT:
This amplifier stage has saturation control and high dynamics. The stage comprises a pair of input current sources connected in series between a pair of reference voltage lines, a pair of output transistors, connected between the pair of reference voltage lines and defining an intermediate output terminal and a driving circuit comprising active elements and interposed between the input current sources and the output transistors. Saturation control is achieved through a pair of control circuits, one for each output transistor, comprising each a resistor interposed between the driving circuit and the respective output transistor so as to preset the balance saturation gain of the respective output transistor, and a transistor connected with its base to the driving circuit and with its collector and emitter between the output of the amplifier stage and the intermediate connection point between the input current sources, so as to define a negative feedback reducing imbalances existing between the currents fed by the input current sources, and therefore prevent high saturation levels of the transistors.

REFERENCES:
patent: 4431972 (1984-02-01), Ishii et al.
patent: 4471323 (1984-09-01), Trilling

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