Current gain amplifier cell

Details Current gain amplifier cell Current gain amplifier cell

1979-01-25

1981-03-31

Mullins, James B.

Amplifiers

With semiconductor amplifying device

Including current mirror amplifier

330293, 330308, 330311, H03F 304, H03F 308

Patent

active

042596432

ABSTRACT:
A three terminal current gain cell is made up of a three-stage common emitter high gain amplifier configuration using complementary transistors. A controlled percentage of the output is coupled back to the input to provide negative feedback. The emitters of the complementary devices are coupled to the appropriate terminals that comprise the cell output. One of the devices employs a dual ratioed collector with the smaller of the two collectors being made to track the input current due to the feedback condition. Thus, the current gain of the cell is determined by a geometric ratio. The gain can be further multiplied by employing additional ratioed devices within the cell or by cell cascading. In one application, the current gain cell is combined with a photo sensor providing the input current. This produces a two terminal device that passes a current linearly related only to the illumination level over a very large range of illumination and other ambient conditions.

REFERENCES:
patent: 3822387 (1974-07-01), Mulder

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