Method and integrated circuit for temperature coefficient compensation
AssigneeTexas Advanced Optoelectronic Solutions, Inc.
InventorWilliam W. Wiles, Jr.
Life of this patent
Estimating the term…
Abstract
An integrated circuit adapted to output a bandgap reference voltage with temperature coefficient compensation (VBG_TC) includes a first circuit responsive to a bandgap reference voltage (VBG) for generating a temperature stable reference current. A second circuit applies the temperature stable reference current through a current mirror to a current summing junction. A third circuit sums the temperature stable reference current against a current proportional to absolute temperature (IPTAT). Lastly, a fourth circuit converts the summed current into the bandgap reference voltage with temperature coefficient compensation (VBG_TC).
Claims23
An integrated circuit adapted to output a bandgap reference voltage with temperature coefficient compensation (VBG_TC), comprising:
- a first circuit responsive to a bandgap reference voltage (VBG) for generating a temperature stable reference current;
- a second circuit for applying the temperature stable reference current through a current mirror to a current summing junction;
- a third circuit for summing the temperature stable reference current against a current proportional to absolute temperature (IPTAT);
- and
- a fourth circuit for converting the summed current into the bandgap reference voltage with temperature coefficient compensation (VBG_TC).
A method for generating a bandgap reference voltage with temperature coefficient compensation (VBG_TC) comprising:
- generating a temperature stable reference current in response to a bandgap reference voltage (VBG);
- applying the temperature stable reference current through a current mirror to a current summing junction;
- summing the temperature stable reference current against a current proportional to absolute temperature (IPTAT);
- and
- converting the summed current into the bandgap reference voltage with temperature coefficient compensation (VBG_TC).
A method for generating a bandgap reference voltage with temperature coefficient compensation (VBG_TC) comprising:
- generating a bandgap reference voltage by equalizing emitter currents of a first transistor and a second transistor and trimming out error to achieve a desired frequency tolerance;
- generating a temperature stable reference current in response to the bandgap reference voltage (VBG);
- applying the temperature stable reference current through a current mirror to a current summing junction;
- summing the temperature stable reference current against a current proportional to absolute temperature (IPTAT);
- and
- converting the summed current into the bandgap reference voltage with temperature coefficient compensation (VBG13 TC), wherein converting the summed current into the bandgap reference voltage with temperature coefficient compensation (VBG_TC) includes providing an op-amp having a non-inverting input, an inverting input, and an output, coupling the bandgap reference voltage (VBG) to the op-amp non-inverting input, coupling the summing junction to the op-amp inverting input, further including providing a feedback resistor (RTC) coupled between the op-amp inverting input and the op-amp output.
Dependencies are inferred from the claim text.