Trimmable bandgap voltage reference
First Claim
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1. A bandgap reference, comprising:
- a first current source configured to provide a current that is proportional to the sum of a first voltage having a positive-to-absolute-temperature (PTAT) temperature dependency and a second voltage having a complementary-to-absolute-temperature (CTAT) dependency; and
a a first variable resistor including a first resistor and a plurality of second resistors, wherein each of the second resistors is adapted to be selectively combined in parallel with the first resistor, and wherein the second voltage is inversely proportional to the resistance of the first variable resistor.
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Abstract
A bandgap reference includes a current source providing a current that is proportional to the sum of a first voltage having a positive-to-absolute-temperature (PTAT) temperature dependency and a second voltage having a complementary-to-absolute-temperature (CTAT) dependency. The bandgap reference further includes a variable resistor comprising a fixed resistor that may be selectively combined with one or more of a plurality of selectable resistors, wherein the first voltage is inversely proportional to the resistance of the variable resistor.
28 Citations
17 Claims
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1. A bandgap reference, comprising:
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a first current source configured to provide a current that is proportional to the sum of a first voltage having a positive-to-absolute-temperature (PTAT) temperature dependency and a second voltage having a complementary-to-absolute-temperature (CTAT) dependency; and
aa first variable resistor including a first resistor and a plurality of second resistors, wherein each of the second resistors is adapted to be selectively combined in parallel with the first resistor, and wherein the second voltage is inversely proportional to the resistance of the first variable resistor. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A method of configuring a bandgap reference, wherein the bandgap reference comprises a first variable resistor including a first resistor and a plurality of second resistors, wherein each of the second resistors is adapted to be selectively coupled in parallel with the first resistor such that resistance of the first variable resistor is variable in discrete increments depending upon whether a given second resistor is selected to be coupled in parallel with the first resistor, and wherein a contribution from a voltage component having a positive-to-absolute-temperature (PTAT) temperature dependency to an output voltage of the bandgap reference is inversely proportional to the resistance of the first variable resistor, the method comprising:
assigning resistances to the first and second resistors such that the discrete increments for the resistance of the first variable resistor are substantially equal. - View Dependent Claims (11, 12)
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13. A bandgap reference, comprising:
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a first current source configured to provide a current that is proportional to the sum of a first voltage having a positive-to-absolute-temperature (PTAT) temperature dependency and a second voltage having a complementary-to-absolute-temperature (CTAT) dependency;
a differential amplifier responsive to the difference to between the first and second voltages, the differential amplifier controlling the current provided by the first current source; and
a first variable resistor including a first resistor and a plurality of second resistors, wherein each of the second resistors is adapted to be selectively combined in parallel with the first resistor, and wherein the second voltage is inversely proportional to resistance of the variable resistor. - View Dependent Claims (14, 15, 16, 17)
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Specification