Patent ID: 9535103
Date: 2017-01-03
CPC Classifications: G01L,G01R

Claim:
1. A method for reading out a sensor unit having a first set of nodes and a second set of nodes, said sensor unit being an impedance bridge, the method comprising: changing the readout configuration of the sensor unit by exchanging excitation and sensing between the first set of nodes and the second set of nodes, said exchanging comprising using switching units such as to switch excitation signals emanating from excitation nodes from being applied to the first set of nodes to being applied to the second set of nodes and to switch differential measurement signals measured at sensing nodes from being obtained from the second set of nodes to being obtained from the first set of nodes; and evaluating the similarity or deviation between measurement signals obtained in different readout configurations of the sensor unit, said different readout configurations corresponding to different states of said switching units, such as to make a distinction, based on the measurement signals, between impedance variations due to a sensed physical signal and variations due to mismatch.