Piecewise compensation for voltage reference temperature drift
AssigneeTexas Instruments Incorporated
InventorsTallam Vishwanath, Sandeep Shylaja Krishnan
Life of this patent
Estimating the term…
Abstract
This description relates generally to piecewise temperature compensation. In an example, a circuit includes a knee code selector that can be configured to set a knee point temperature for a correction current responsive to a respective knee point temperature code of knee point temperature codes and a respective temperature sense signal of temperature sense signals. The circuit includes an output circuit that can be configured to provide the correction current responsive to the respective temperature sense signal and temperature voltages, and a trim digital to analog converter (DAC) that can be configured to provide a piecewise compensation current responsive to the correction current and a respective trim code of trim codes.
Claims18
A circuit comprising:
- a current generation circuit having a plurality of temperature inputs including a first temperature input and a second temperature input, a first code input, a second code input, and an output, the current generation circuit configurable to:
- receive a first signal at the first temperature input;
- receive a second signal at the second temperature input;
- receive a first code at the first code input;
- receive a second code at the second code input;
- responsive to the first signal indicating that a temperature is in a first range, provide a current at the output responsive to the first code;
- and
- responsive to the second signal indicating that the temperature is in a second range, provide the current at the output responsive to the second code.
A system comprising:
- a current generation circuit having a temperature input and an output and configurable to:
- provide a current at the output;
- responsive to a signal at the temperature input indicating that the temperature is in a first range, adjust the current with respect to the temperature according to a first relationship;
- and
- responsive to the signal at the temperature input indicating that the temperature is in a second range, adjust the current with respect to the temperature according to a second relationship;
- and
- a bandgap reference circuit having an input coupled to the output of the current generation circuit.
Dependencies are inferred from the claim text.