Title :
Trimming of current mode DACs by adjusting Vt
Author :
Biman, A. ; Nairn, D.G.
Author_Institution :
Dept. Electr. & Comput. Eng., Queen´´s Univ., Kingston, Ont., Canada
Abstract :
R-2R current mode DACs are useful in many mixed digital/analog applications. Unfortunately, the accuracy of these DACs is limited by device matching. To correct the mismatch, a trimming technique based on trimming the threshold voltage by adjusting the substrate bias is proposed. The advantage of this technique is its ease of integration into almost any CMOS process. To demonstrate the trimming technique, an R-2R ladder was fabricated. The results indicate that the technique is feasible for trimming errors due to mismatch
Keywords :
CMOS integrated circuits; digital-analogue conversion; error correction; ladder networks; CMOS process; DAC trimming; R-2R ladder; current mode DACs; mismatch errors; substrate bias adjustment; threshold voltage trimming; Analog-digital conversion; Application software; CMOS process; Circuits; Costs; MOSFETs; Production; Resistors; Switches; Threshold voltage;
Conference_Titel :
Circuits and Systems, 1996. ISCAS '96., Connecting the World., 1996 IEEE International Symposium on
Conference_Location :
Atlanta, GA
Print_ISBN :
0-7803-3073-0
DOI :
10.1109/ISCAS.1996.539801
