D/A conversion circuit, organic EL drive circuit and organic...

Details D/A conversion circuit, organic EL drive circuit and organic... D/A conversion circuit, organic EL drive circuit and organic...

2006-09-26

2009-12-08

Williams, Howard (Department: 2819)

Coded data generation or conversion

Analog to or from digital conversion

With particular solid state devices

C341S145000

Reexamination Certificate

active

07629908

ABSTRACT:
A D/A converter of the current switching type has a first current mirror circuit that D/A converts the upper (n−m) digits in n bit data to be converted and a weighting current circuit block or a second current mirror circuit that D/A converts the lower m digits in the data, by cascade connecting the weighting current circuit block or the second current mirror circuit at the upstream or at the downstream side of an output side transistor other than the output side transistors of the first current mirror circuit. In this manner, current flowing through the output side transistor flows as diverting currents to the weighting current circuit block or the second current mirror circuit corresponding to the digit weights of the lower m digits, and the diverting currents are taken out at the outputs of the D/A conversion circuit as analog converted currents of the lower m digits.

REFERENCES:
patent: 4594577 (1986-06-01), Mao
patent: 4931795 (1990-06-01), Gord
patent: 6958719 (2005-10-01), Moon
patent: 7477217 (2009-01-01), Maede et al.
patent: 60130220 (1985-07-01), None
patent: 2003-234655 (2003-08-01), None
patent: 2004037656 (2004-02-01), None

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