| 摘要 |
PURPOSE:To trim a temperature-sensor IC chip by a method wherein a temperature is computed on the basis of a difference between the following two voltages and this temperature is used as a temperature reference: two monitor transistors are connected in parallel, a definite electric current flows to them and a base-to- emitter voltage is found; the same definite electric current flows to only one monitor transistor and a base-to-emitter voltage is found. CONSTITUTION:Two monitor transistors 31, 32 whose performance is identical and where a collector and a base are short-circuited individually are formed in a temperature-sensor IC chip 3 in a process to form the monitor transistors. The transistors 31, 32 are connected in parallel in a process to decide a temperature reference. A definite electric current IO flows to the parallelconnected transistors 31, 32; a base-to-emitter voltage VBE1 is found; then, the same definite electric current IO flows to only the transistor 31; a base-to-emitter voltage VBE2 is found; a temperature is computed on the basis of a difference between both base-to-emitter voltages VBE1, VBE2; said temperature sensor IC is trimmed by using this temperature as the temperature reference. |
