Digital to analog converter with current sources paired for canc

Details Digital to analog converter with current sources paired for canc Digital to analog converter with current sources paired for canc

1992-02-05

1992-11-17

Hoff, Marc

Coded data generation or conversion

Converter compensation

341144, H03M 106

Patent

active

051647257

ABSTRACT:
In a digital to analog converter of the type having an array of current sources that are selected according to a digital input code to produce a current sum that is an analog of the digital code, current sources are arranged in pairs to form a dual current cell. When a dual current cell is selected, it produces two currents of differing magnitudes that are summed on two output busses with corresponding currents from other selected dual cells. These currents are subtracted to form an analog current. The two currents tend to have similar errors from a nominal current value and these errors are canceled by the subtraction. The two current sources of each dual current cell are oppositely switchable between two current levels, and the number of current sources is the minimum number commonly used for arrays of current cells having only one current source.

REFERENCES:
patent: 4573005 (1986-02-01), van de Plassche
patent: 4594577 (1986-06-01), Mao
patent: 4695826 (1987-09-01), Ando et al.
patent: 4874964 (1989-10-01), Kondo
patent: 5036322 (1991-07-01), Barrow et al.
patent: 5084701 (1992-01-01), Sauerwald
Y. Nakamura, "A 10-b 70 MS/S CMOS D/A Converter", IEEE Journal of Solid State Circuits, vol. 26, No. 4, Apr. 1991, pp. 637-642.
Chu Chong, "A Technique for Improving the Accuracy and the Speed of CMOS Current-Cell DAC", IEEE Transactions on Circuits and Systems, vol. 37, No. 10, Oct. 1990, pp. 1325-1327.

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