TEMPERATURE DRIFT COMPENSATION
First Claim
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1. A method for trimming a voltage reference circuit, comprising:
- adjusting an output voltage of a bandgap circuit to a reference voltage at a first temperature;
generating a temperature compensation voltage to adjust the output voltage as a function of temperature, the generating comprising setting a first resistive digital-to-analog converter to produce a weighted sum of a voltage proportional to absolute temperature and a voltage complementary to absolute temperature; and
providing the temperature compensation voltage to the bandgap circuit to adjust the output voltage.
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Abstract
A voltage reference circuit includes a bandgap circuit and a temperature compensation circuit. The temperature compensation circuit includes a first trim circuit, a second trim circuit, and a resistive digital-to-analog converter. The resistive digital-to-analog converter is coupled to the first trim circuit, the second trim circuit, and the bandgap circuit. The resistive digital-to-analog converter is configured to generate a temperature compensation voltage, and to provide the temperature compensation voltage to the bandgap circuit.
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8 Claims
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1. A method for trimming a voltage reference circuit, comprising:
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adjusting an output voltage of a bandgap circuit to a reference voltage at a first temperature; generating a temperature compensation voltage to adjust the output voltage as a function of temperature, the generating comprising setting a first resistive digital-to-analog converter to produce a weighted sum of a voltage proportional to absolute temperature and a voltage complementary to absolute temperature; and providing the temperature compensation voltage to the bandgap circuit to adjust the output voltage. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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