US 4,905,006 AGranted

Digital-to-analog converter

AssigneeU.S. Philips Corporation

InventorMarcellinus J. M. Pelgrom

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Abstract

A digital-to-analog converter for converting a digital signal having a word length n into an analog signal comprises a series arrangement of at least two integrating circuits (1,2) and a control unit (18) for supplying a first and a second control signal (S1, S2) to the first and the second integrating circuit. The integrating circuits are adapted to perform an integration step under the influence of the first and the second control signal. The control unit is adapted to generate, in this order, the first control signal M1 times, the second control signal M2 times, the first control signal M3 times and the second control signal M4 times. For converting arbitrary digital signals M2+M4 is equal to a constant (k). Due to this measure an offset voltage which is independent of the value of the n-bit digital signal to be converted is produced at the output (8) of the converter. For converting n-bit digital signal the constant k is preferably taken to be equal to 2.sup.p in which p.ltoreq.n.

Claims17

Dependent claims

A digital-to-analog converter for converting a digital signal having a word length n into an analog signal, comprising

a series arrangement of a first and a second integrating circuit each having an input an output and a control signal input, the output of the first integrating circuit being coupled to the input of the second integrating circuit,
a control unit for supplying a first and a second control signal at a first and a second output, respectively, coupled to the control signal input of the first and the second integrating circuit, respectively, for applying the first and the second control signal to the first and the second integrating circuit, respectively,
the first and the second integrating circuit being adapted to perform an integration step under the influence of the first and the second control signal, respectively, and the control unit being adapted to generate, in this order, the first control signal M1 times, the second control signal M2 times, the first control signal M3 times and the second control signal M4 times, characterized in that M2+M4 is equal to a constant (k) for converting arbitrary digital signals having a word length n.

Dependencies are inferred from the claim text.