High-gain common-emitter output stage

Details High-gain common-emitter output stage High-gain common-emitter output stage

1996-07-19

1998-04-07

Mottola, Steven

Amplifiers

With semiconductor amplifying device

Including particular biasing arrangement

330267, H03F 326

Patent

active

057369020

ABSTRACT:
A high gain common-emitter output stage for an amplifier is disclosed. In one embodiment, an output stage for an amplifier circuit according to the invention includes: a first transistor having a base, an emitter and a collector, the emitter being connected to a first potential through a first resistor, the collector being connected to a second potential through a series connection of a second resistor and a bias current source, the base being connected between the second resistor and the bias current; a second transistor having a base, an emitter and a collector, the emitter being connected to the first potential, the collector being connected to the second potential through a load element, the base being connected to the collector of said first transistor; and a signal current source for supplying a current signal to be amplified. The output stage according to the invention is advantageous because the gain provided is exponential, yet the bias condition remains stable. The output stage also operates efficiently from a power perspective as power consumption is low during quiescent conditions.

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"Precision Rail-to-Rail Input & Output Operational Amplifier" (OP284/OP484), Analog Devices, Inc., 1995.
"Voltage Feedback Amplifier", Bipolar Circuits and Technology Meeting 9.1, p. 145, IEEE, 1993.

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