Operational amplification circuit, overheat detecting...

Details Operational amplification circuit, overheat detecting... Operational amplification circuit, overheat detecting...

2006-04-25

2006-04-25

JeanPierre, Peguy (Department: 2819)

Amplifiers

With semiconductor amplifying device

Including differential amplifier

C330S252000, C330S257000, C330S262000, C330S288000, C330S289000

Reexamination Certificate

active

07034616

ABSTRACT:
In a circuit according to the present invention, a multi-collector transistor is provided which includes first to third collectors so that, when a current does not flow from the second collector, a current from the first collector increases but a current from the third collector does not vary. When transistors of the circuit turn off because the voltage of an input signal gets out of an in-phase input voltage range, the supply of the current from the second collector comes to a stop and, hence, the current from the first collector increases. In this situation, further transistors carry out their on/off operations, thereby fixing the output of the circuit to a low level. That is, this circuit can, irrespective of poor pair compatibility between the transistors, fix the output logical level to a desired level when the voltage of an input signal gets out of an in-phase input voltage range.

REFERENCES:
patent: 4068254 (1978-01-01), Erdi
patent: 4780625 (1988-10-01), Zobel
patent: 6433636 (2002-08-01), Kasuya et al.
patent: 2001/0009389 (2001-07-01), Kasuya et al.
patent: 5-10988 (1993-01-01), None
patent: 5-315869 (1993-11-01), None
patent: 8-263157 (1996-10-01), None
patent: 9-260971 (1997-10-01), None

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