Current-output type digital-to-analog converter

Details Current-output type digital-to-analog converter Current-output type digital-to-analog converter

2007-05-29

2008-10-28

Nguyen, Khai M (Department: 2819)

Coded data generation or conversion

Analog to or from digital conversion

Digital to analog conversion

C341S135000, C341S136000

Reexamination Certificate

active

07443327

ABSTRACT:
Source potentials of n output transistors are fixed by common fixed voltage, and sources are connected to a current output terminal. A drain and a gate of an input transistor are commonly connected to the drains and the gates of the output transistors respectively. A first current-to-voltage conversion unit is connected onto the drain side of the input transistor to convert current Im2flowing through the input transistor into voltage Vx1. A second current-to-voltage conversion unit converts reference current Iref into voltage Vx2. The voltages Vx1and Vx2are input to a first error amplifier, and the first error amplifier adjusts gate voltages of the input transistor and output transistors. n switches are provided on a path through which output of the first error amplifier reaches the gate of the output transistor. A control unit controls on/off of the switch according to a digital signal.

REFERENCES:
patent: 4982192 (1991-01-01), Murooka
patent: 6683549 (2004-01-01), Kinugasa
patent: 6917322 (2005-07-01), Ueno et al.
patent: 7019676 (2006-03-01), Ikoma et al.
patent: 2002-330072 (2002-11-01), None
patent: 2004-22929 (2004-01-01), None

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