Patent ID: 6686798
Filing Date: 2004-02-03
Classification: G05F,H03M

Abstract:
A reference voltage circuit for generating at least one constant reference voltage with:(a) a first current mirror circuit, which is connected to a positive supply voltage and mirrors a reference current with a first current mirror factor to form a first mirrored reference current, (b) a second current mirror circuit, which is connected to a negative supply voltage and mirrors a reference current with a second current mirror factor to form a second mirrored reference current, (c) a resistor string, which comprises a plurality of resistors connected in series and is wired between the two current mirror circuits; â€ƒone end of the resistor string being supplied with the first mirrored reference current from the first current mirror circuit and the other end of the resistor string delivering the second mirrored reference current to the second current mirror circuit, (d) the two current mirror factors of the current mirror circuits being equal, so that constant reference voltages can be picked off at the resistors of the resistor string.