Patent ID: 6570437
Filing Date: 2003-05-27
Classification: G05F

Abstract:
A bandgap reference voltage circuit, comprising:a bandgap start-up circuit for initiating operation of the bandgap reference voltage circuit; a bandgap core circuit for developing a bandgap reference voltage and having: (a) a low impedance leg to which said bandgap start-up circuit is connected; and (b) a high impedance leg; and a bandgap output circuit for supplying the bandgap reference voltage and having a feedback circuit connected to said high impedance leg of said bandgap core circuit; wherein (i) said low impedance leg of said bandgap core circuit includes a connected FET and a transistor connected to said diode connected FET, (ii) said bandgap start-up circuit is connected to the junction of said diode connected FET of said low impedance leg of said bandgap core circuit and said transistor of said low impedance leg of said bandgap core circuit, (iii) said high impedance leg of said bandgap core circuit includes a FET having a drain and a transistor having a collector, and (iv) said feedback circuit of said bandgap output circuit is connected to said drain of said FET of said high impedance leg of said bandgap core circuit and said collector of said transistor of said high impedance leg of said bandgap core circuit, and said feedback circuit of said bandgap output circuit includes two stages of amplification.