Digital-to-analog converter with digital correction

Details Digital-to-analog converter with digital correction Digital-to-analog converter with digital correction

1988-03-23

1989-06-27

Shoop, Jr., William M.

Coded data generation or conversion

Analog to or from digital conversion

Digital to analog conversion

341118, H03M 166

Patent

active

048433926

ABSTRACT:
A true N-bit digital-to-analog converter (DAC), i.e. a DAC the absolute accuracy error of which is less than 1 LSB (or .+-.1/2 LSB), can be composed of easy obtainable and low-priced components. The DAC distinguishes a very fast, highly accurate, high resolution conversion of a digital input code into an equivalent voltage or current.
Two or more DACs are cascaded in order to attain a high resolution. Only one ROM and an associated DAC are necessary to obtain an accuracy error of less than 1 LSB, in consequence of the increased resolution. The final trimming can be conducted in packaged form of the device through the ROM programming.
For example, a true 16-bit DAC can be composed of three equal true 8-bit DACs, wherein their absolute accuracy error must be less than 0.992 LSB. A ROM with the storage capacity of only 256 bytes is necessary.

REFERENCES:
patent: 4070665 (1978-01-01), Glennon et al.
patent: 4465996 (1984-08-01), Boyacigiller et al.
patent: 4503421 (1985-03-01), Hareyama et al.
patent: 4523182 (1985-06-01), Harvey et al.

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