Patent ID: 6933770
Filing Date: 2005-08-23
Classification: G05F,H01L

Abstract:
1. An apparatus including a metal oxide semiconductor (MOS) bandgap voltage reference circuit, comprising: MOS current source circuitry including a control terminal and first, second, third and fourth output terminals, and responsive to a control signal by providing an output voltage via said first output terminal, substantially equal first and second source currents via said second and third output terminals, and first and second source voltages via said third and fourth output terminals; first parasitic substrate transistor circuitry, coupled to said second output terminal, with first base, emitter and collector terminals and a first emitter area; second parasitic substrate transistor circuitry, coupled to said third output terminal, with second base, emitter and collector terminals and a second emitter area, wherein said first emitter area is greater than said second emitter area, and one of said second emitter and collector terminals is mutually coupled with a like one of said first emitter and collector terminals; a first resistance coupled between said first and second base terminals; amplifier circuitry coupled to said third and fourth output terminals and said control terminal, and responsive to said first and second source voltages by providing said control signal; resistive circuitry coupled to said first output terminal, said second base terminal and said mutually coupled first and second parasitic substrate transistor circuitry terminals; and a plurality of dummy transistors with mutually coupled base terminals coupled to said second base terminal, and mutually coupled emitter terminals and mutually coupled collector terminals coupled to said mutually coupled first and second parasitic substrate transistor circuitry terminals.