A simple accurate bridge-transducer interface with continuous autocalibration

Author

Van der Goes, Frank M L ; Meijer, Gerard C M

Author_Institution

Fac. of Electr. Eng., Delft Univ. of Technol., Netherlands

Volume

46

Issue

3

fYear

1997

fDate

6/1/1997 12:00:00 AM

Firstpage

704

Lastpage

710

Abstract

This paper presents a one-chip simple and accurate transducer interface for resistive bridges. A key part of this interface is formed by a novel dynamic voltage divider. In this divider the bridge supply voltage is measured for reference purposes in small parts (piece-wise measurement) which are within the range of the bridge output voltage. The use of an autocalibration technique, the three-signal method, eliminates influeuce of linear parameters and errors. Moreover, the effects of the nonidealities of the applied switches are also eliminated. The circuit has been realized in a 3 μm BiCMOS process and shows an uncertainty of only 10 μV for a bridge supply voltage of 5 V

Keywords

BiCMOS integrated circuits; bridge circuits; calibration; computer interfaces; computerised instrumentation; electric resistance measurement; peripheral interfaces; transducers; voltage dividers; voltage measurement; 10 muV; 3 mum; 5 V; BiCMOS; autocalibration; bridge output voltage; bridge supply voltage; bridge-transducer interface; charge amplifier; continuous autocalibration; dynamic voltage divider; errors; linear parameters; nonidealities; piece-wise measurement; reference; resistive bridges; stochastic errors; switches; three-signal method; uncertainty; BiCMOS integrated circuits; Bridge circuits; Calibration; Electrical resistance measurement; Intelligent sensors; Microcontrollers; Resistors; Switches; Transducers; Voltage measurement;

fLanguage

English

Journal_Title

Instrumentation and Measurement, IEEE Transactions on

Publisher

ieee

ISSN

0018-9456

Type

jour

DOI

10.1109/19.585437

Filename

585437