| 摘要 |
<p>A temperature measurement circuit includes a switched sensing circuit and measures alternately a characteristic of the switched sensing circuit that depends on a thermistor and on a reference resistor, using common electrical components, including a multi-pole switch. The resistance of the thermistor varies with temperature over a known temperature range, and the resistance of the reference resistor remains substantially fixed over the range of temperatures being measured. The temperature measurement circuit also includes a detection circuit. The switched sensing circuit responds to a temperature to be measured, and also responds to a detection circuit sitich control signal. It provides switched sensing circuit signals containing information about the characteristic of the sensing circuit with the thermistor and the reference resistor, in turn, switched into the circuit. The detection circuit provides the detection circuit switch control signal, and responds to the switched sensing circuit signals. It provides a detection circuit signal containing information about the temperature to be measured. In one embodiment, the common set of electrical components includes a capacitor connected in series with a multi-pole switch in the switched sensing circuit and a comparator in the detection circuit. In another embodiment, the switched sensing circuit is a (switched) resistance-tunable oscillating circuit.</p> |
