Transistorschakeling welke in staat is de invloed van parameters van componenten te elimineren en temperatuuraftastinrichting welke deze gebruikt.

摘要

A transistor circuit capable of eliminating influence of component parameter and a temperature sensing apparatus using the same are disclosed in the invention. The temperature sensing apparatus includes a current-producing unit, a switching unit, a current-duplicating unit and a transistor. The temperature sensing apparatus is used to measure ambient temperature utilizing the voltage difference of the base and the emitter of the transistor varied with temperature. The current-duplicating unit duplicates the base current of the transistor and applies the duplicated current to the emitter of the transistor so as to avoid the influence of a component parameter variation of the transistor at different temperatures and to eliminate the measurement error caused by a component parameter difference between different transistors. Therefore, the novel temperature sensing apparatus improves the precision and the accuracy of temperature measurement.