Digital to analog converter linearity with mismatched current so

Details Digital to analog converter linearity with mismatched current so Digital to analog converter linearity with mismatched current so

1996-06-17

1998-03-10

Hoff, Marc S.

Coded data generation or conversion

Analog to or from digital conversion

Digital to analog conversion

341118, H03M 178

Patent

active

057266522

ABSTRACT:
The linearity of a digital to analog converter is greatly enhanced by applying the same current to each of the nodes of a R-2R ladder network. This is accomplished by breaking the conversion cycle into n time slots and sequencing the connection of the current sources such that each will be connected to a different node in each of the time slots. In this way all the current sources will be connected to each node once in the conversion cycle and the current flowing into the each node will be the average value of all of the currents. Since each node receives this same average current, the linearity of the digital to analog converter is enhanced and is not a function of the mismatch of the applied current sources.

REFERENCES:
patent: 4034366 (1977-07-01), Memishian, Jr.
patent: 5036322 (1991-07-01), Barrow et al.

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