CMOS bandgap refrence with built-in curvature correction
OwnerBruce E. Amazeeninventor
Life of this patent
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Abstract
A bandgap reference voltage cell that produces a first-order and a second-order temperature-compensated reference voltage output includes four bipolar transistors. At least one of the four transistors is biased with a current having a different temperature coefficient than that of a current which biases at least the second of the four transistors. The first and second order temperature compensation to the reference voltage is realized within the bandgap cell itself.
Claims20
A method of producing a temperature-compensated reference voltage comprising steps of:
- providing a stacked bandgap cell including at least four bipolar elements;
- and
- biasing at least a first of the four elements with a first quiescent current and biasing at least a second of the four elements with a second quiescent current;
- wherein a temperature coefficient of the first quiescent current is different from a temperature coefficient of the second quiescent current.
A bandgap cell that produces a first-order and a second-order temperature-compensated reference output voltage comprising:
- at least first and second bipolar elements;
- wherein the first bipolar element is biased with a first quiescent current and the second bipolar element is biased with a second quiescent current, a temperature coefficient of the first quiescent current being different from a temperature coefficient of the second quiescent current.
A method for providing a temperature-compensated bandgap reference voltage comprising:
- providing a bandgap reference voltage cell including at least two bipolar elements;
- and
- realizing first and second order temperature compensation to the reference voltage within the bandgap cell.
Dependencies are inferred from the claim text.