Logic circuit

Details Logic circuit Logic circuit

2006-04-25

2006-04-25

Le, Don (Department: 2819)

Electronic digital logic circuitry

Signal sensitivity or transmission integrity

Signal level or switching threshold stabilization

C326S031000, C326S115000

Reexamination Certificate

active

07034568

ABSTRACT:
The power supply-voltage dependency of a current source current is reduced and the power supply voltage is lowered. The invention includes an emitter-coupled logic circuit118and a reference-voltage generating circuit119for generating a reference voltage VCSC for controlling a drain current (=current source current ICS) of a constant current-supplying n-type MOS transistor110.The emitter-coupled logic circuit118comprises a current switch made up of a pair of emitter-coupled bipolar transistors106and107,a constant current-supplying n-type MOS transistor110that is connected in series with the current switch, and resistor means108and109connected in series with the bipolar transistors106and107individually for obtaining an output voltage. The reference-voltage generating circuit119comprises an n-type MOS transistor111,a bipolar transistor112which determines the drain voltage of the n-type MOS transistor111,and a control circuit120for controlling the drain current of the n-type MOS transistor111.

REFERENCES:
patent: 5225720 (1993-07-01), Kondoh et al.
patent: 5471131 (1995-11-01), King et al.
patent: 6127854 (2000-10-01), Illegems
patent: 6127868 (2000-10-01), Phillips
patent: 6239616 (2001-05-01), Churcher et al.
patent: 2001-267859 (2000-03-01), None

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