Coded data generation or conversion – Analog to or from digital conversion – With particular solid state devices
Patent
1992-02-20
1993-07-13
Pellinen, A. D.
Coded data generation or conversion
Analog to or from digital conversion
With particular solid state devices
341144, H03M 166
Patent
active
052277933
ABSTRACT:
A digital-to-analog converter employing CMOS configuration. A first load resistor is selectively connected between an output terminal and ground. A first output circuit, selectively connected between the output terminal and a positive supply voltage, comprises a plurality of PMOS transistors constituting constant-current sources and electronic switches connected in series. A second load resistor is selectively connected between the output terminal and the positive supply voltage. A second output circuit, selectively connected between the output terminal and ground, comprises a plurality of NMOS transistors constituting constant-current sources and electronic switches connected in series. Selected constant-currents from PMOS transistors are switched to the first load resistor through the common output terminal depending on one group of input digital codes. Selected constant-currents of NMOS transistors are switched to the second load resistor through the common output terminal depending on the other group of input digital codes.
REFERENCES:
patent: 4683458 (1987-07-01), Hallgren
patent: 5055844 (1991-10-01), Kasai
Pellinen A. D.
Ricoh & Company, Ltd.
Young Brian K.
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