Bandgap voltage reference based temperature compensation circuit
AssigneeUnitrode Corporation
InventorBurt L. Price
Life of this patent
Estimating the term…
Abstract
A voltage-to-current converter for use with a bandgap voltage reference circuit for providing a correction current to compensate for the adverse effects of temperature. In one specific embodiment, the voltage-to-current converter is used to provide output voltage curvature correction to the resident bandgap voltage reference circuit.
Claims17
A corrector circuit for providing a correction current to compensate for the adverse effects of temperature, said corrector circuit comprising:
- a bandgap voltage reference circuit, said bandgap voltage reference circuit having an output voltage dividing resistor network in a feedback loop thereof, said bandgap voltage reference circuit providing a voltage signal that is proportional to absolute temperature;
- at least one differential transistor pair, wherein a first transistor in said pair is responsive to said voltage signal that is proportional to absolute temperature, and wherein a second transistor in said pair is responsive to a corresponding voltage signal derived from said output voltage dividing resistor network;
- and
- at least one corresponding current source for insuring that there is a constant flow of current to said at least one differential transistor pair for use in providing a temperature compensating correction current.
A corrector circuit for providing a correction current to compensate for the adverse effects of temperature, said corrector circuit comprising:
- a bandgap voltage reference circuit, said bandgap voltage reference circuit having an output voltage dividing resistor network in a feedback loop thereof, said bandgap voltage reference circuit providing a voltage signal that is proportional to absolute temperature;
- at least one differential transistor pair, wherein a first transistor in said pair is responsive to said voltage signal that is proportional to absolute temperature, and wherein a second transistor in said pair is responsive to a corresponding voltage signal derived from said output voltage dividing resistor network;
- and
- at least one corresponding current sink for insuring that there is a constant flow of current from said at least one differential transistor pair for use in providing a temperature compensating correction current.
An improved bandgap voltage reference circuit that provides output voltage curvature correction to compensate for the adverse effects of temperature, wherein said bandgap voltage reference circuit has an output voltage dividing resistor network in a feedback loop thereof, and wherein said bandgap voltage reference circuit provides a voltage signal that is proportional to absolute temperature, the improvement comprising:
- at least one differential transistor pair, wherein a first transistor in said pair is responsive to said voltage signal that is proportional to absolute temperature, and wherein a second transistor in said pair is responsive to a corresponding voltage signal derived from said output voltage dividing resistor network;
- and
- at least one corresponding current source for insuring that there is a constant flow of current to said at least one differential transistor pair for use in providing a temperature compensating correction current.
A voltage-to-current converter for use with a bandgap voltage reference circuit for providing a correction current to compensate for the adverse effects of temperature, wherein said bandgap voltage reference circuit has an output voltage dividing resistor network in a feedback loop thereof, and wherein said bandgap voltage reference circuit provides a voltage signal that is proportional to absolute temperature, said voltage-to-current converter comprising:
- at least one differential transistor pair, wherein a first transistor in said pair is responsive to said voltage signal that is proportional to absolute temperature, and wherein a second transistor in said pair is responsive to a corresponding voltage signal derived from said output voltage dividing resistor network;
- and
- at least one corresponding current source for insuring that there is a constant flow of current to said at least one differential transistor pair for use in providing a temperature compensating correction current.
A voltage-to-current converter for use with a bandgap voltage reference circuit for providing a correction current to compensate for the adverse effects of temperature, wherein said bandgap voltage reference circuit has an output voltage dividing resistor network in a feedback loop thereof, and wherein said bandgap voltage reference circuit provides a voltage signal that is proportional to absolute temperature, said voltage-to-current converter comprising:
- at least one differential transistor pair, wherein a first transistor in said pair is responsive to said voltage signal that is proportional to absolute temperature, and wherein a second transistor in said pair is responsive to a corresponding voltage signal derived from said output voltage dividing resistor network;
- and
- at least one corresponding current sink for insuring that there is a constant flow of current from said at least one differential transistor pair for use in providing a temperature compensating correction current.
A voltage-to-current converter for use with a bandgap voltage reference circuit for providing a correction current to compensate for the adverse effects of temperature, wherein said bandgap voltage reference circuit has an output voltage dividing resistor network in a feedback loop thereof, and wherein said bandgap voltage reference circuit provides a voltage signal that is proportional to absolute temperature, said voltage-to-current converter comprising:
- at least one first differential transistor pair, wherein a first transistor in said first differential transistor pair is responsive to said voltage signal that is proportional to absolute temperature, and wherein a second transistor in said first differential transistor pair is responsive to a corresponding voltage signal derived from said output voltage dividing resistor network;
- at least one corresponding current source for insuring that there is a constant flow of current to said at least one first differential transistor pair for use in providing a temperature compensating correction current;
- at least one second differential transistor pair, wherein a first transistor in said second differential transistor pair is responsive to said voltage signal that is proportional to absolute temperature, and wherein a second transistor in said second differential transistor pair is responsive to a corresponding voltage signal derived from said output voltage dividing resistor network;
- and
- at least one corresponding current sink for insuring that there is a constant flow of current from said at least one second differential transistor pair for use in providing said temperature compensating correction current.
Dependencies are inferred from the claim text.