Title :
A digital trimmable comparator for high precision ADCs in wireless sensor nodes
Author :
Jung, Melanie ; Ferizi, Alban ; Ussmueller, Thomas ; Fischer, Georg ; Weigel, Robert
Author_Institution :
Inst. for Electron. Eng., Friedrich-Alexander Univ. Erlangen-Nuernberg, Erlangen, Germany
Abstract :
A new concept of a digital trimmable comparator for high precision analog-to-digital converters is presented. The rail-to-rail comparator structure leads to a higher resolution of the ADC compared to other comparator concepts due to its innovative mismatch cancellation. Conventional comparators have a discrepancy between the simulated resolution and the extracted or produced structure. Due to the presented bit-programmable trimming mechanism the mismatch problem can be significantly reduced. The new structure consisting of a comparator and a bit programmable delay is shown. This building block is suitable for low-power, high-precision ADCs with an LSB (Least significant bit) of only some hundred microvolts, which are frequently used in the receiving path of high performance wireless sensor nodes.
Keywords :
CMOS digital integrated circuits; analogue-digital conversion; comparators (circuits); low-power electronics; programmable circuits; CMOS integrated circuit; LSB; bit programmable delay; bit-programmable trimming mechanism; digital trimmable comparator; innovative mismatch cancellation; least significant bit; low power high precision analog-to-digital converter; low-power high-precision ADC; rail-to-rail comparator structure; wireless sensor node; Clocks; Delay; Inverters; Latches; Layout; Transistors; Vectors; Analog-digital conversion; CMOS integrated circuits; analog-digital integrated circuits; component architecture; programmable circuits;
Conference_Titel :
Semiconductor Conference Dresden (SCD), 2011
Conference_Location :
Dresden
Print_ISBN :
978-1-4577-0431-4
DOI :
10.1109/SCD.2011.6068760
