Title :
Design and implementation of an untrimmed MOSFET-only 10-bit A/D converter with -79-dB THD
Author :
Hammerschmied, Clemens M. ; Huang, Qiuting
Author_Institution :
Integrated Syst. Lab., Eidgenossische Tech. Hochschule, Zurich, Switzerland
fDate :
8/1/1998 12:00:00 AM
Abstract :
A MOSFET-only 10-bit A/D converter is described which achieves a total harmonic distortion of up to -79 dB without trimming or calibration. The maximum conversion rate is 200 ksample/s. Implemented in a 1-μm single-poly technology, it occupies 5.12 mm2 and consumes 12 mW from a single 5 V supply. The MOSFET-only R-2R ladder, which is the center of the successive approximation architecture, is analyzed, and design considerations, especially the device dimensions, are given. Measurements of the linear behavior of pure MOSFET ladders are presented. The offset sensitivity of the ladder is examined, and an alternative way of summing the ladder current is suggested. A fast and effective differential current comparator is described
Keywords :
MOSFET circuits; analogue-digital conversion; comparators (circuits); harmonic distortion; ladder networks; 1 micron; 10 bit; 12 mW; 5 V; R-2R ladder; current summing circuit; design; differential current comparator; offset sensitivity; single-poly technology; successive approximation architecture; total harmonic distortion; untrimmed MOSFET-only A/D converter; Calibration; Fuses; Helium; Linearity; MOSFET circuits; Manufacturing; Production; Resistors; Total harmonic distortion; Wireless communication;
Journal_Title :
Solid-State Circuits, IEEE Journal of
