Title :
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
fDate :
6/1/1997 12:00:00 AM
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;
Journal_Title :
Instrumentation and Measurement, IEEE Transactions on
