RESISTIVE GAS SENSOR AND GAS SENSING METHOD THEREFOR

Resistive gas sensor and a gas sensing method therefor are provided. The resistive gas sensor includes a sensing circuit and a determination circuit. The sensing circuit senses a gas to generate a detection signal. The determination circuit performs a frequency-division operation on the detection signal by a frequency-division parameter to generate a frequency-division signal, counts a half of a period of the frequency-division signal to generate a half-period count value, and determines concentration of the gas according to the half-period count value. The determination circuit determines thefrequency-division parameter according to the half-period count value. 本发明提供了一种电阻式气体传感器与其气体感测方法，该电阻式气体传感器包括感测电路以及判断电路。感测电路感测气体以产生检测信号。判断电路以分频参数来对检测信号进行分频操作以产生分频信号，对分频信号的一半周期进行计数以产生半周期计数值，且根据半周期计数值来判断气体的浓度。此外，判断电路根据半周期计数值来调整分频参数。