| 摘要 |
The physical parameter measurement method is performed using an electronic circuit (1) with a resistive sensor (2). The resistive sensor includes two resistors (R1, R2) mounted in series, whose connection node connected to a moving mass (M), is connected to a first input of an amplifier-comparator (3). A second input of the amplifier-comparator receives a reference voltage. One output of the amplifier-comparator is connected to a logic unit (4), which provides a digital output signal (OUT). A digital-to-analogue converter (5) provides a measurement voltage (Vdac), as a function of a digital signal provided by the logic unit, to the first resistor (R1) in a first phase of a measurement cycle, whereas the second resistor (R2) is polarized by a polarization voltage, and to the second resistor in a second phase, whereas the first resistor is polarized by a polarization voltage via a switching unit. |
| 主权项 |
1. A method for measuring a physical parameter by means of an electronic circuit with a resistive sensor, which includes a resistive divider with at least two resistors mounted in series, wherein a connection node of the two resistors is connected to a moving mass, which is elastically retained in a fixed structure of the sensor, and to a first input of an amplifier-comparator, a second input of the amplifier-comparator receiving a reference voltage, one output of the amplifier-comparator being connected to a logic unit for digital processing of the information provided by the amplifier-comparator and for providing at least one digital output signal, and a digital-to-analogue converter capable of providing a measurement voltage to a free end of the first resistor or to a free end of the second resistor via a switching unit, the measurement voltage being defined on the basis of a conversion of a binary word of the logic unit, which defines at least one measurement signal,
wherein the method includes several successive measurement cycles for one measurement conversion, wherein each successive measurement cycle comprises the steps of: a) polarizing, via the switching unit, the free end of the second resistor by a polarization voltage and the free end of the first resistor by a measurement voltage provided by the digital-to-analogue converter based on a first digital measurement signal from a preceding cycle or from an initial binary word provided by the logic unit, the first digital signal depending on a first polarization of the resistive sensor, b) polarizing, via the switching unit, the free end of the first resistor by a polarization voltage and the free end of the second resistor by a measurement voltage provided by the digital-to-analogue converter based on a second digital measurement signal from a preceding cycle or from an initial binary word provided by the logic unit, the second digital signal depending on a second polarization of the resistive sensor. |
