Signal output circuit

Details Signal output circuit Signal output circuit

Filed on

2006-12-12

Date issued

2006-12-12

Examiner

Le, Don (Department: 2819)

Patent Class

Electronic digital logic circuitry

SubClass

Interface

SubSubClass

Logic level shifting

Other Related Categories

C326S063000, C326S126000

Type

Reexamination Certificate

Status

active

Patent number

07148724

Description

ABSTRACT:
The signal output circuit1includes a first and a second emitter follower circuit, and a comparator20. The comparator20receives output signals from the first and the second emitter follower circuit, and outputs a result of comparison in magnitude between those signals. The comparator20includes a transistor T5(fifth transistor), a transistor T6(sixth transistor), a resistance element R3, and a current mirror circuit30. The resistance element R3connects the emitters of the transistor T5and of the transistor T6. To the collectors of the transistor T5and the transistor T6, the current mirror circuit30is connected.

REFERENCES:
patent: 5089789 (1992-02-01), Van Tran
patent: 5812020 (1998-09-01), Raghavan et al.
patent: 6166566 (2000-12-01), Strong
patent: 2002/0080651 (2002-06-01), Tanzawa et al.
patent: 2003/0107425 (2003-06-01), Yushan
patent: 2005/0035788 (2005-02-01), Devendorft et al.
patent: 2006/0012415 (2006-01-01), Chen
patent: 5-70020 (1993-09-01), None

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