Patent ID: 6285245
Filing Date: 2001-09-04
Classification: G05F

Abstract:
A constant voltage generating circuit comprising a voltage generating circuit made up of a first bipolar transistor connected as a first diode and an amplifier circuit that amplifies the voltage across the first diode to output a prescribed voltage; a reference current source circuit that sources current to the first diode; and a current control circuit that shunts current flowing to the first diode away from the first diode, wherein the current control circuit comprises a first resistor, a second bipolar transistor, and a third bipolar transistor, which are connected in series between first and second power supply rails as well as a fourth bipolar transistor connected in parallel with the first diode; where the base of the second bipolar transistor is connected to its collector to form a second diode, and the base of the third bipolar transistor and the base of the fourth bipolar transistor are connected to the collector of the third bipolar transistor to form a first current mirror circuit.