DocumentCode :
2404157
Title :
A Versatile Low Power Oversampled A/D Converter
Author :
Nys, Olivier ; Dijkstra, Evert
Author_Institution :
Centre Suisse d´´Electron. et de Microtech. S.A., Neuchatel, Switzerland
fYear :
1992
fDate :
21-23 Sept. 1992
Firstpage :
99
Lastpage :
102
Abstract :
This paper presents a versatile low power oversampled A/D converter that can be either configured as a sigma delta converter or an incremental converter. The latter refers to oversampled instrumentation converters that cancel offset and 1/f noise. Versatility is achieved by keeping the design completely modular and programmable. Indeed, the implemented converter has been built with a number of identical slices, each consisting of an analog modulator and a companion digital accumulator. Programmable options are : sigma delta or incremental mode, selection of modulator order between 1 and 4, choice of oversampling factor between 2**3 and 2**18, and a comb filter order setting between 1 and 5. The proposed architecture not only leads to simpler structures. It also permits a rapid tailoring of area-optimized A/D converters to given ASIC specifications. In incremental mode, a 16 bits resolution is achieved for DC input values with an integral non-linearity error of ±20 μV. Offset and even order harmonics are cancelled to non-observable levels. The power consumption is, in this mode, 20 μA on a supply of ±2 V.
Keywords :
analogue-digital conversion; application specific integrated circuits; comb filters; ASIC specifications; DC input values; analog modulator; area-optimized A/D converters; comb filter order setting; companion digital accumulator; current 20 muA; incremental converter; incremental mode; integral nonlinearity error; oversampled instrumentation converters; sigma delta converter; versatile low power oyersampled A/D converter; voltage -2 V; voltage -20 V; voltage 2 V; voltage 20 V; word length 16 bit; Analog-digital conversion; Application specific integrated circuits; Delta modulation; Delta-sigma modulation; Digital modulation; Energy consumption; Instruments; Modulation coding; Noise cancellation; Power harmonic filters;
fLanguage :
English
Publisher :
ieee
Conference_Titel :
Solid-State Circuits Conference, 1992. ESSCIRC '92. Eighteenth European
Conference_Location :
Copenhagen
Print_ISBN :
87-984232-0-7
Type :
conf
DOI :
10.1109/ESSCIRC.1992.5468420
Filename :
5468420
Link To Document :
بازگشت