Patent ID: 6661713
Filing Date: 2003-12-09
Classification: G05F

Abstract:
A bandgap reference circuit comprising:a differential amplifier whose two inputs are compared to produce a difference signal and whose output is fed back to two input resistors of different values; a first input bias resistor, one end of which is connected to a first differential input, the other end of which is connected to a P-side of a first diode, whose N-side is connected to ground; a second input bias resistor, one end of which is connected to a second differential input, the other end of which is connected to a third input bias resistor, wherein said second input bias resistor is used to raise the voltage level of said first differential input; wherein said third input bias resistor, one end of which is connected to said second input bias resistor and whose other end is connected to a P-side of a second diode or multiple diodes whose N-side is connected to ground; a first differential input path which contains said first input bias resistance connected to said first differential input; a second differential input path which contains said second input bias resistance connected to said second differential input; a path parallel to said first differential input path which contains a capacitor connected between said first differential input and ground, a first feedback path from the differential output to a first feedback resistor whose other side is connected to said first differential input, a second feedback path from the differential output to a second feedback resistor whose other side is connected to said second differential input, and a differential output node which is driven by an MOS FET.