Temperature-measuring switch for substrate of semiconductor IC chip

摘要

The switch uses the transistor in emitter switching configuration and has an ohmic voltage dividing circuit applied beforehand. The current from a constant current source is divided between the divider and the transistor. The resistance's are produced on the substrates, so that the ratio is independent of temperature. The output voltage over the transistor and the divider is solely dependent on the temperature coefficient of Vbe of the transistor and is multiplied by the inverse of the divider ratio.