Patent ID: 9170308
Filing Date: 2015-10-27
Classification: G01R

Abstract:
1. A circuit, comprising a plate-shaped sensor element made of doped semiconductor material, the plate-shaped sensor element having at least a first excitation contact connected to a first excitation node, and at least a second excitation contact connected to a second excitation node, and at least a first sense contact connected to a first sense node and at least a second sense contact connected to a second sense node; the plate-shaped sensor element being embedded in a substrate or well such that it is isolated from the substrate or well by means of a first PN-junction, the substrate or well being connectable to a first fixed voltage, the circuit comprising: a) a first current source connectable to the first excitation node for applying a predefined first current; b) a controllable second source adapted for applying a second current to the second excitation node; c) a negative feedback loop for controlling the second source, based on a comparison between a value representative for a common mode voltage of the voltages of the sense nodes and a predefined reference voltage, such that the common mode voltage is substantially equal to the predefined reference voltage.