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US 9,671,800 B2Granted
Bandgap circuit with temperature correction
AssigneeOl Security Limited Liability Company
InventorDavid Cave
Life of this patent
Estimating the term…
Abstract
A temperature corrected voltage bandgap circuit is provided. The circuit includes first and second diode connected transistors. A first switched compare circuit is coupled to the one transistor to inject or remove a first current into or from the transistor. The first current is selected to correct for curvature in the output voltage of the bandgap circuit at one of hotter or colder temperatures.
Claims16
A method, comprising:
- receiving an output reference voltage;
- comparing, using a first compare circuit, a first voltage at a first current node of a first transistor with a first voltage threshold, wherein the first voltage threshold is based, at least in part, on the output reference voltage;
- and
- removing a first current from the first current node of the first transistor to correct a first curvature of the output reference voltage for low temperatures based, at least in part, on said comparing a first voltage.
1 more element
A circuit, comprising:
- a bandgap circuit configured to provide an output reference voltage, wherein the bandgap circuit includes a first temperature compensation circuit, a second temperature compensation circuit, and an amplifier, and wherein the first temperature compensation circuit is coupled to a first input of the amplifier via a first electrical pathway and the second temperature compensation circuit is coupled to a second input of the amplifier via a second electrical pathway that is different from and does not overlap with the first electrical pathway;
- a first compare circuit coupled to the first temperature compensation circuit and configured to remove a first current from the first temperature compensation circuit to correct a first curvature of the output reference voltage for low temperatures;
- and
- a second compare circuit coupled to the second temperature compensation circuit and configured to inject a second current into the second temperature compensation circuit to correct a second curvature of the output reference voltage for high temperatures.
1 more element
Dependencies are inferred from the claim text.