Bandgap voltage reference and method with further temperature correction
First Claim
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1. A circuit for generating a stable reference voltage over a wide temperature range, comprising:
- a voltage generator for providing a relatively stable output voltage within a known temperature range, said generator including (i) first and second mismatched bipolar transistors, the emitters of said first and second bipolar transistors tied together, (ii) a first resistor connected between the bases of said first and second bipolar transistors, and (iii) a second resistor in series with said first resistor and passing said first current, said generator providing said relatively stable output voltage from current determined by said first resistor; and
circuitry for adjusting said output voltage responsive to a predetermined temperature to maintain a stable output voltage, said circuitry providing current at through said second resistor and parallel said first resistor for temperatures outside of said known temperature range.
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Abstract
A voltage reference circuit (26) provides a stable output reference voltage over a wide temperature range. A high temperature curvature correction circuit (36) is enabled at a first predetermined temperature to adjust the output voltage accordingly. A low temperature curvature correction circuit (38) is enabled at temperatures below a second predetermined temperature to similarly affect a output voltage. The preferred embodiment, the high and low curvature correction circuits (36, 38) are operable to vary the current through one or more resistors in a bandgap circuit (26) or other reference circuit.
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Citations
13 Claims
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1. A circuit for generating a stable reference voltage over a wide temperature range, comprising:
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a voltage generator for providing a relatively stable output voltage within a known temperature range, said generator including (i) first and second mismatched bipolar transistors, the emitters of said first and second bipolar transistors tied together, (ii) a first resistor connected between the bases of said first and second bipolar transistors, and (iii) a second resistor in series with said first resistor and passing said first current, said generator providing said relatively stable output voltage from current determined by said first resistor; and circuitry for adjusting said output voltage responsive to a predetermined temperature to maintain a stable output voltage, said circuitry providing current at through said second resistor and parallel said first resistor for temperatures outside of said known temperature range. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. The method of generating a stable output voltage reference comprising the steps of:
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generating a relatively stable output voltage over a known temperature range by the use of emitter tied mismatched bipolar transistors with bases connected by a first resistor and with said relatively stable output voltage determined by a first current through said first resistor; detecting a predetermined temperature; and adjusting said output voltage in response to said temperature detection in order to provide a stable voltage reference by drawing a second current through a second resistor, said second resistor in series with said first resistor and said second resistor passing said first current. - View Dependent Claims (10, 11, 12, 13)
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Specification