Fml. Vandergoes et Gcm. Meijer, A SIMPLE ACCURATE BRIDGE-TRANSDUCER INTERFACE WITH CONTINUOUS AUTOCALIBRATION, IEEE transactions on instrumentation and measurement, 46(3), 1997, pp. 704-710
This paper presents a one-chip simple and accurate transducer interfac
e for resistive bridges. A key part of this interface is formed by a n
ovel dynamic voltage divider, In this divider the bridge supply voltag
e is measured for reference purposes in small parts (piece-wise measur
ement) which are within the range of the bridge output voltage. The us
e of an autocalibration technique, the three-signal method, eliminates
influence of linear parameters and errors. Moreover, the effects of t
he nonidealities of the applied switches are also eliminated. The circ
uit has been realized in a 3 mu m BiCMOS process and shows an uncertai
nty of only 10 mu V for a bridge supply voltage of 5 V.