Patent ID: 6781441
Filing Date: 2004-08-24
Classification: G05F

Abstract:
A circuit comprising:a first current route for providing a first current wherein between an internal reference voltage terminal and a ground terminal, a first resistor is connected in series with a first npn transistor of which collector is connected with said first resistor and of which base is connected with said collector; a second current route for providing a second current of a negative temperature characteristics and proportional to said first current wherein between an external voltage source and said ground terminal, a first pnp transistor, a second resistor, a second npn transistor and a third resistor are connected in series in this order, said second resistor being connected with the collector of said first pnp transistor, said third resistor being connected with the emitter of said second npn transistor, the collector of said second npn transistor being connected with said second resistor, the base of said first pnp transistor being connected with the collector of said second npn transistor, the base of said second npn transistor being connected with the collector of said first npn transistor; and a third current route for providing a third current proportional to said second current which is outputted as a very small current wherein a second pnp transistor is connected between said external voltage source and said ground terminal in which the second pnp transistors base is connected with a base of the collector of said first pnp transistor.