Patent ID: 7193402
Filing Date: 2007-03-20
Classification: G05F,Y10S

Abstract:
1. A bandgap reference voltage circuit, comprising: a first metal oxide semiconductor field effect transistor having a first source electrically connected to a relatively high voltage, and a first gate electrically connected to a first drain thereof; a second metal oxide semiconductor field effect transistor having a second source electrically connected to said relatively high voltage, a second gate electrically connected to said first gate and a second drain; a third metal oxide semiconductor field effect transistor having a third gate electrically connected to said second gate, a third source and a third drain; a first resistor having a first terminal electrically connected to said relatively high voltage and a second terminal electrically connected to said third source; a second resistor having a third terminal electrically connected to said first drain and having a fourth terminal; a first bipolar junction transistor having a first emitter electrically connected to said fourth terminal and having a first base and a first collector mutually and electrically connected to a relatively low voltage; a second bipolar junction transistor having a second emitter electrically connected to said second drain and having a second base and a second collector mutually and electrically connected to said relatively low voltage; and a third resistor having a fifth terminal electrically connected to said second emitter and a sixth terminal electrically connected to said third drain to supply a bandgap reference voltage, wherein said third metal oxide semiconductor field effect transistor has a drain current to be decreased by said first resistor in response to a rising temperature, so as to keep a voltage between said third source and said third drain higher than a specific value.