Patent ID: 6016051
Filing Date: 2000-01-18
Classification: G05F,Y10S

Abstract:
An apparatus including a bandgap reference circuit, the bandgap reference circuit comprising:a proportional to absolute temperature (PTAT) current source that provides a PTAT current;a bias current source that provides a bias current;a transistor having a base, an emitter, and a collector, the base coupled to the IPTAT current source and the emitter coupled to the bias current source;a first resistive circuit coupled between the emitter and the base of the transistor, the first resistive circuit configured to receive a portion of the bias current and in accordance therewith provide a current proportional to a base-emitter voltage of the transistor; anda second resistive circuit coupled to the base of the transistor and configured to receive the PTAT current and the current proportional to the base-emitter voltage of the transistor and in accordance therewith provide a reference voltage which remains substantially constant over temperature and which is proportional to a silicon bandgap voltage,wherein the proportionality of the reference voltage to the silicon bandgap voltage is determined by a ratio of the first and second resistive circuits.