Patent ID: 7675352
Filing Date: 2010-03-09
Classification: G09G

Abstract:
1. A system for generating reference voltages comprising: an integrated reference voltage generating circuit comprising: a resistor circuit comprising a plurality of resistors coupled in series; a first switch controlled by a first control signal and coupled between a first end of the resistor circuit and a first power source; a second switch controlled by the first control signal and coupled between the first end of the resistor circuit and a second power source; a third switch controlled by a second control signal and coupled between a second end of the resistor circuit and the first power source; a fourth switch controlled by the second control signal and coupled between the second end of the resistor circuit and the second power source; a first resistor coupled between the first end of the resistor circuit and the first switch; a second resistor coupled between the first end of the resistor circuit and the second switch; a third resistor coupled between the second end of the resistor circuit and the third switch; a fourth resistor coupled between the second end of the resistor circuit and the fourth switch; and a control circuit for generating the first and second control signals; wherein the first and the second ends of the resistor circuit are coupled to the first voltage source respectively via the first and the third switches in a power-saving mode.