Patent ID: 8698213
Filing Date: 2014-04-15
Classification: G01L

Abstract:
1. A pressure-sensitive amplifier stage comprising four unipolar pressure-sensor transistors, each comprising a control terminal and a current path arranged between a further first and a further second terminal, said current path being sensitive to mechanical tension, said four pressure-sensor transistors being connected as a pressure-measuring bridge having two bridge legs, each of said bridge legs comprising a first and a second pressure-sensor transistor which are connected in series with respect to their current paths, two unipolar control transistors, each having a control terminal and a current path arranged between a further first and a further second terminal, the respective first and second terminals of said two control transistors being connected in pairs, and the control terminals of the control transistors each being connected to a node between the pressure-sensor transistors of the two bridge legs, and the interconnected second terminals of the two parallel-connected control transistors being connected to the control terminals of the second pressure-sensor transistors of the two bridge legs, a first power source connected between a first supply voltage on the one hand, and the first terminals of the first pressure-sensor transistors of the two bridge legs and the interconnected first terminals of the control transistors on the other hand, said first power source being provided for generating a first current, and a second power source connected between a second supply voltage on the one hand, and the interconnected second terminals of the control transistors and the control terminals of the second pressure-sensor transistors of the two bridge legs on the other hand, said second power source being provided for generating a second current, the control terminals of the first pressure-sensor transistors of the two bridge legs being adapted for connection thereto of a respective operating input voltage, and a measurement output voltage being detectable between the respective pressure-sensor transistors of the two bridge legs, and said measurement output voltage of the pressure-measuring bridge being connectable to the control terminals of the first pressure-sensor transistors of the two bridge legs of a further pressure-measuring bridge for cascading the pressure-measuring bridges.