Digital-to-analog converter

Details Digital-to-analog converter Digital-to-analog converter

2011-03-15

2011-03-15

Williams, Howard (Department: 2819)

Coded data generation or conversion

Analog to or from digital conversion

With particular solid state devices

C341S144000, C323S316000

Reexamination Certificate

active

07907072

ABSTRACT:
A DAC unit, connected to a current supply transistor, includes first control transistors connected in parallel to each other, with each being connected in series to the current supply transistor. The first control transistors drive currents at different current values in response to a bias voltage. The DAC unit also includes second control transistors connected in parallel to each other, with each being connected in series to the current supply transistor. Each second control transistor drives the current having the same current value as one of the first control transistors in response to the single bias voltage. The first and second control transistors driving the currents having the same current value operate in a complementary manner based on part of a digital code. The DAC unit generates an output current by selectively combining at least one of the currents driven by the first control transistors.

REFERENCES:
patent: 6842132 (2005-01-01), Schafferer
patent: 6844835 (2005-01-01), Kao
patent: 2003/0001656 (2003-01-01), Tucholski et al.
patent: 2004/0257251 (2004-12-01), Hsueh
patent: 2008/0136694 (2008-06-01), Imai
patent: 2009/0015454 (2009-01-01), Sugai
patent: 2009/0167579 (2009-07-01), Kawano
English language abstracts of JP 1997-191252, JP 2002-009623, and JP 2007-336540.

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