Digital-to-analog converter including current sources operable i

Details Digital-to-analog converter including current sources operable i Digital-to-analog converter including current sources operable i

1998-09-08

2000-09-12

Williams, Howard L.

Coded data generation or conversion

Analog to or from digital conversion

Digital to analog conversion

341119, H03M 166

Patent

active

061183989

ABSTRACT:
A digital-to-analog converter (DAC) includes a plurality of current sources on a substrate operable in a predetermined sequence of use for generating an output current based upon a digital input, and a connection network for establishing the predetermined sequence of use for the current sources based upon the actual current values and to increase performance of the DAC. For example, the predetermined sequence of use can be set to reduce integral non-linearity error of the DAC. The connection network may be provided by a plurality of fusible links selectively connected to set the predetermined sequence of use. The current sources may include a first group of most significant bit (MSB) current sources for a predetermined number of MSBs. In addition, the plurality of current sources may include a second group of mid-most significant bit (mid MSBs) current sources for a predetermined number of mid MSBs. The plurality of current sources have actual values sortable from lowest to highest, and each actual current value will define an error value with both a magnitude and polarity relative to the desired value. One embodiment for sorting the order of use of the current sources is based upon the error values.

REFERENCES:
patent: 4567463 (1986-01-01), Naylor
patent: 4864215 (1989-09-01), Schouwenaara et al.
patent: 5790060 (1998-08-01), Tesch
patent: 5949362 (1999-09-01), Tesch et al.
Product Sheet for Harris Semiconductor HI5760, "10-Bit, 125/60 MSPS, High Speed D/A Converter", (Jul. 1998).
Product Sheet for Harris Semiconductor HI5741, "14-Bit, 100 MSPS, High Speed D/A Converter", (Mar. 1998).

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