Patent ID: 8026756
Filing Date: 2011-09-27
Classification: G05F

Abstract:
1. A voltage reference circuit comprising: an operational amplifier circuit; first and second resistor elements; first and second diodes; and first and second transistors, wherein said first resistor element and said first diode are connected in series between a first input terminal of said operational amplifier circuit and a reference level node, wherein said second resistor element and said second diode are connected in series between a second input terminal of said operational amplifier circuit and the reference level node, wherein said first transistor is connected between a power supply node and said first input terminal of said operational amplifier circuit, wherein said first transistor has a control electrode receiving an output of said operational amplifier circuit, wherein said second transistor is connected between the power supply node and said second input terminal of said operational amplifier circuit, wherein said second transistor has a control electrode receiving the output of said operational amplifier circuit, and wherein a temperature coefficient of at least one of voltages of said first and second input terminals of said operational amplifier circuit is substantially set to zero by adjusting a value of R