Patent ID: 7242240
Filing Date: 2007-07-10
Classification: G05F

Abstract:
1. A bandgap circuit comprising: a plurality of cells, each cell having at least four transistors, where the cells are connected in series to sum a ΔV BE of each cell to produce an output voltage and each cell comprises: a first transistor of said at least four transistors having a collector connected to a current source and to a base of the first transistor, the base of the first transistor connected to a base of a fourth transistor of said at least four transistors, a emitter of the first transistor connected to a collector of a second transistor of said at least four transistors, the collector of the second transistor connected to a base of a third transistor of said at least four transistors, a base of the second transistor connected to a collector of the third transistor, an emitter of the second transistor connected to a first terminal of a resistor, an emitter of the third transistor connected to a second terminal of the resistor, the collector of the third transistor connected to an emitter of the fourth transistor; and a collector of the fourth transistor connected to a voltage source; and the first terminal of the resistor within a first cell of the plurality of cells is coupled to ground, and the second terminal of the resistor in each other cell of the plurality of cells is connected to the emitter of the third transistor of the previous cell of the plurality of cells.