Temperature characteristic compensation apparatus

Miscellaneous active electrical nonlinear devices – circuits – and – Specific identifiable device – circuit – or system – With specific source of supply or bias voltage

Reexamination Certificate

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Details

C327S513000

Reexamination Certificate

active

06870421

ABSTRACT:
The invention provides a temperature characteristic compensation apparatus that correct temperature characteristics of control circuits using thermal sensors into linear or optional temperature gradients to guarantee correct and stable operations thereof. It is equipped with a temperature characteristic compensation apparatus, that can include: a constant current source in which a plurality of constant current paths that include the constant current path having a first resistance being interposed therein, which compose current mirror circuits in multiple stages, a band gap circuit formed from a pair of transistors that are connected to the constant current paths, respectively, and a voltage follower circuit, including the aforementioned constant current source and the band gap circuit that provide a reference voltage, which supplies the reference voltage at a low impedance. The ratio between the first and second resistances can be freely selected in connection with the ratio between emitter areas of the pair of transistors (the size ratio of the two transistors), such that a gradient of temperature coefficient of the output voltage can be flexibly set.

REFERENCES:
patent: 6438038 (2002-08-01), Ikehashi et al.
patent: 6710641 (2004-03-01), Yu et al.
patent: 02-012509 (1990-01-01), None
patent: 03-008004 (1991-01-01), None
patent: 3-45391 (1991-07-01), None
patent: 2000284844 (2000-10-01), None
patent: 2000-330658 (2000-11-01), None

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