Overload protection to prevent saturation of video amplifiers
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United States of America Patent
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-
Feb 10, 1981
Grant Date -
N/A
app pub date -
Aug 14, 1978
filing date -
Aug 14, 1978
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
In a dual stage power transistor type amplifier in which a video signal is applied to the base of a first stage transistor and in which the output of the first stage is direct coupled to the emitter of the second or power stage, and in which the second stage has a substantially constant d.c. voltage applied to its base, and a higher constant d.c. voltage applied to its collector through a load impedance. A voltage limiting device such as a Zener diode is shunted across at least a portion of the load impedance. With the fixed voltage on the base and a limited d.c. voltage on the collector, saturation and overload of the transistor is prevented.
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