Patent ID: 7619401
Filing Date: 2009-11-17
Classification: G05F

Abstract:
1. A bandgap circuit, comprising: a first amplifier; a second amplifier; a reference circuit, being electrically connected to an output terminal of the first amplifier and including: wherein the source of each of the metal oxide semiconductors is jointly and electrically connected to a power supply and each of the metal oxide semiconductors providing equal drain currents; and a compensation circuit, electrically connected to the power supply to which each of the metal oxide semiconductors is electrically connected, and including a plurality of transistors and the second amplifier, wherein the gates of the plurality of transistors are jointly connected to the output terminal of the second amplifier, and wherein the first amplifier provides an input to the second amplifier, whereby the reference circuit outputs a stable startup voltage that has a low sensitivity to a change of temperature and a change of supplied voltage.