High stability no feedback optical transistor amplifier system
AssigneeSperry Corporation
InventorRoy K. Hill
Life of this patent
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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.
Claims6
An amplifier for low amplification optical detector systems comprising:
- a source of light signals,
- a photo transistor having its input coupled to said source of light signals,
- a bipolar non-symmetrical transistor having its base coupled to the output of said photo transistor,
- a power source comprising a high level and a low level voltage,
- said photo transistor being coupled between said high level voltage and said bipolar non-symmetrical transistor without a feedback input, and
- said bipolar non-symmetrical transistor being reverse connected between said high level voltage and said low level voltage without a feedback output, whereby the response time of said bipolar non-symmetrical transistor is substantially increased and the gain is reduced without a feedback circuit.
Dependencies are inferred from the claim text.