Differential string DAC with improved integral non-linearity per

Details Differential string DAC with improved integral non-linearity per Differential string DAC with improved integral non-linearity per

1994-11-21

1997-05-06

Young, Brian K.

Coded data generation or conversion

Analog to or from digital conversion

Digital to analog conversion

341145, H03M 168

Patent

active

056275374

ABSTRACT:
A differential string DAC is provided including a coarse DAC which includes a plurality of coarse resistors connected in series between first and second reference voltage leads. A positive sub-DAC includes a plurality of positive sub-DAC cells, each positive sub-DAC cell including a multitude of series-connected fine resistors. A negative sub-DAC includes a plurality of negative sub-DAC cells, each negative sub-DAC cell including a multitude of series-connected fine resistors. Each coarse resistor is electrically connected in parallel with one positive sub-DAC cell and one negative sub-DAC cell. The positive sub-DAC cell and negative sub-DAC cell are substantially symmetrically disposed about the corresponding coarse resistor. Due to the differential arrangement and symmetrical layout of the DAC, INL errors due to process gradients in one direction across the DAC are greatly reduced. Process gradients in a second orthogonal direction are not of great concern as they cause much smaller INL errors.

REFERENCES:
patent: 4612531 (1986-09-01), Dingwall et al.
patent: 4897658 (1990-01-01), Fujii et al.
patent: 4973979 (1990-11-01), Ikeda
patent: 4990916 (1991-02-01), Wynne et al.
patent: 5059978 (1991-10-01), Valdenaire
patent: 5084667 (1992-01-01), Drori et al.
Razavi et al., A 12-b 5-MSample/s Two-Step CMOS A/D Converter, IEEE Jrnl. of Solid-State Circuits, vol. 27, No. 1, Dec. 1992, pp. 1667-1678.
Shih et al., A CMOS 5-V Analog Front End for 9600-bit/s Facsimile Modems, Ieee Jrnl. of Solid-State Circuits, vol. sc-22, No. 6, Dec. 1987, pp. 990-995.
Brigati et al., "Active Compensation of Parasitic Capacitance for Very High Frequency CMOS DACs", 1993 IEEE International Symposium on Circuits and Systems, vol. 2 of 4, pp. 1208-1211.

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