Piezoresistive pressure sensor disconnection alarm and signal acquisition circuit

The invention belongs to the technical field of aviation alarm, and discloses a piezoresistive pressure sensor disconnection alarm and signal acquisition circuit. Comprising a signal acquisition circuit, a filter circuit and a signal processing unit, wherein the signal acquisition circuit consists of five resistors R1, R2, R3, R4 and R5, four capacitors C1, C2, C2 and C4, a diode D1 and an operational amplifier U1; the signal acquisition circuit, the filter circuit and the signal processing unit are connected in sequence; the circuit can carry out effective disconnection alarm on an absolute pressure sensor, a gauge pressure sensor and a differential pressure sensor, and can accurately collect output signals of a piezoresistive pressure sensor. 本发明属于航空报警技术领域，公开了一种压阻式压力传感器断线报警及信号采集电路。包括：由五个电阻R1、R2、R3、R4、R5，四个电容C1、C2、C2、C4，一个二极管D1，一个运算放大器U1组成的信号采集电路，以及滤波电路和信号处理单元；所述信号采集电路、滤波电路和信号处理单元依次连接；该电路能够对绝压传感器、表压传感器和压差传感器进行有效断线报警，同时能够准确采集压阻式压力传感器输出信号。