Temperature-compensated integrated circuit for uniform current generation
First Claim
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1. A temperature-compensated integrated circuit comprising:
- a first resistor, means for maintaining a base-emitter voltage differential across the first resistor to develop a first resistor current,a second resistor, means for maintaining a base-emitter voltage across the second resistor to develop a second resistor current,means for mirroring the first resistor current, andmeans for subtracting the second resistor current from the mirrored current to obtain a reference current,said resistors having resistance values so that the products of each resistor current multiplied by its total temperature coefficient are equal,whereby the reference current developed by the circuit is temperature independent.
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Abstract
An integrated circuit has a first resistor and a second resistor. A base-emitter voltage differential is maintained across the first resistor to develop a first resistor current and a base-emitter voltage is maintained across the second resistor to develop a second resistor current. The first resistor current is mirrored and the second resistor current is subtracted from the mirrored current to obtain a reference current. The resistors have resistance values so that the products of each resistor current multiplied by its temperature coefficient are equal. The resulting reference current is temperature independent.
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Citations
4 Claims
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1. A temperature-compensated integrated circuit comprising:
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a first resistor, means for maintaining a base-emitter voltage differential across the first resistor to develop a first resistor current, a second resistor, means for maintaining a base-emitter voltage across the second resistor to develop a second resistor current, means for mirroring the first resistor current, and means for subtracting the second resistor current from the mirrored current to obtain a reference current, said resistors having resistance values so that the products of each resistor current multiplied by its total temperature coefficient are equal, whereby the reference current developed by the circuit is temperature independent. - View Dependent Claims (2, 3, 4)
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Specification