High stability no feedback optical transistor amplifier system

Details High stability no feedback optical transistor amplifier system High stability no feedback optical transistor amplifier system

1979-12-28

1981-12-15

Nelms, David C.

Radiant energy

Photocells; circuits and apparatus

Photocell controlled circuit

307311, 330 59, 330308, H03F 1700, H03F 308

Patent

active

043061451

ABSTRACT:
The present invention comprises a low gain amplification circuit for amplifying the output of a light detecting transistor and producing a logic outputstrong enough to drive standard transistor logic circuitry. One or more bipolar non-symmetrical transistors are arranged in a cascade connected circuit to produce an amplification gain less than that of a single conventional transistor. The bipolar non-symmetrical transistors are reverse connected between the high level and low levels of the power supply and all feedback lines are eliminated while the frequency response is substantially increased.

REFERENCES:
patent: 3333106 (1967-07-01), Fischer
patent: 3474251 (1969-10-01), Milford
patent: 3576452 (1971-04-01), Smith
R. L. Bright, "Junction Transistors Used as Switches, " Mar. 1955, A.I.E.E. Transactions, vol. 74, No. 1, pp. 111-121.

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