AN OVERSAMPLING CONVERTER FOR STRAIN-GAUGE TRANSDUCERS

被引：22
作者：
KERTH, DA
PIASECKI, DS
机构：
[1] Crystal Semiconductor Corporation, Austin, TX
来源：
IEEE JOURNAL OF SOLID-STATE CIRCUITS | 1992年 / 27卷 / 12期
关键词：
D O I：
10.1109/4.173094
中图分类号：
TM [电工技术]; TN [电子技术、通信技术];
学科分类号：
0808 ; 0809 ;
摘要：
This paper presents an oversampling converter that directly digitizes low-level strain gauge transducer outputs. An instrumentation amplifier and two independent chopper-stabilized delta-sigma modulators amplify and convert the transducer's output and excitation. Digital division of the two independent conversions produces a 20-b ratiometric measurement. Drift due to external thermocouple junctions and RF rectification is eliminated by ac excitation of the transducer. Interference (50/60 Hz) is eliminated by a digital FIR filter that has a -3-dB bandwidth of 15 Hz. Offset and gain errors are corrected by digital calibration. The input-referred noise of this converter is 150 nV(rms) and the linearity is 110 dB. The converter gain and offset drifts are less than 2.5 ppm/degrees-C and 15 nV/degrees-C, respectively. This 2-mum CMOS chip consumes 30 mW of power and has an area of 25.5 mm2.
引用
收藏
页码：1689 / 1696
页数：8
相关论文
共 13 条
[1]   A MONOLITHIC 20-B DELTA-SIGMA A/D CONVERTER [J].
DELSIGNORE, BP ;
KERTH, DA ;
SOOCH, NS ;
SWANSON, EJ .
IEEE JOURNAL OF SOLID-STATE CIRCUITS, 1990, 25 (06) :1311-1317
[2]  
EARLY AB, 1990, THESIS U ARIZONA TUC
[3]  
Fischer Jonathan H., 1982, IEEE J SOLID STATE C, V17
[4]  
Gray P., 1984, ANAL DESIGN ANALOG I, P197
[5]  
HSIEH KC, 1981, IEEE J SOLID STATE C, V16
[6]  
Lee W. L., 1987, 1987 IEEE International Symposium on Circuits and Systems (Cat. No.87CH2394-5), P459
[7]   A MONOLITHIC CMOS 20-B ANALOG-TO-DIGITAL CONVERTER [J].
LEOPOLD, HA ;
WINKLER, G ;
OLEARY, P ;
ILZER, K ;
JERNEJ, J .
IEEE JOURNAL OF SOLID-STATE CIRCUITS, 1991, 26 (07) :910-916
[8]  
LOU MY, 1990, IEEE T ELECTRON DEV, V37, P768
[9]  
SWANSON EJ, 1990, COMMUNICATION
[10]  
Talmadge P. C., 1992, U.S. Patent, Patent No. 5088330
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