Differential amplifier having a protection circuit

Details Differential amplifier having a protection circuit Differential amplifier having a protection circuit

1998-02-03

1999-05-18

Leja, Ronald W.

Electricity: electrical systems and devices

Safety and protection of systems and devices

With specific quantity comparison means

361 93, 361 56, 330207P, H02H3/18

Patent

active

059056177

ABSTRACT:
In a differential amplifier, when an output node of an output buffer circuit is short-circuited to a high potential supply node, the difference between the potential at an output node of an amplifying circuit and the potential at the output node of the buffer circuit becomes so great as not to be produced in normal operation. A short-circuit protection circuit detects such a state and interrupts or limits a base current supplied to an output transistor of an output pull signal generating circuit, suppressing the flow of excess current into the output node of the buffer circuit.

REFERENCES:
patent: 4042889 (1977-08-01), Baker
patent: 4216517 (1980-08-01), Takahashi
patent: 4440980 (1984-04-01), Bakker
patent: 4644288 (1987-02-01), Stanley
patent: 4714898 (1987-12-01), Botti et al.
patent: 5383083 (1995-01-01), Shinoda et al.
patent: 5650652 (1997-07-01), Mizutani et al.

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