Reference voltage circuit
AssigneeCypress Semiconductor Corporation
InventorAdrian Lin
Life of this patent
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Abstract
According to one or more embodiments, a reference voltage circuit includes a current generator having a first leg configured to generate a first reference current, and a second leg configured to generate a second reference current, an amplifier connected between a supply terminal and the current generator and configured to generate a third reference current, and an output stage configured to mirror the first reference current in the first leg to generate a feedback current, generate a reference voltage at an output terminal based on the feedback current, and provide the feedback current to the second leg of the current generator, wherein the second reference current is a function of the third reference current and the feedback current.
Claims20
A reference voltage circuit, comprising:
- a current generator comprising:
- a first leg configured to generate a first reference current;
- and
- a second leg configured to generate a second reference current;
- an amplifier connected between a supply terminal and the current generator and configured to generate a third reference current;
- and
- an output stage configured to:
- mirror the first reference current in the first leg to generate a feedback current;
- generate a reference voltage at an output terminal based on the feedback current;
- and
- provide the feedback current to the second leg of the current generator, wherein the second reference current is a function of the third reference current and the feedback current.
A reference voltage circuit, comprising:
- an output terminal;
- and
- a current generator comprising:
- a first bipolar junction transistor having a first size;
- a resistor;
- a second bipolar junction transistor connected to the resistor and having a second size greater than the first size;
- an output stage configured to mirror current in the first bipolar junction transistor to generate a feedback current and generate a reference voltage at the output terminal;
- and
- an amplifier connected to the first bipolar junction transistor and the resistor and configured to balance current in the first bipolar junction transistor and the second bipolar junction transistor such that current in the second bipolar junction transistor includes the current in the first bipolar junction transistor and the feedback current.
A method for generating a reference voltage, comprising:
- generating a first reference current in a first leg of a current generator;
- generating a second reference current in a second leg of the current generator;
- generating a third reference current equal to the first reference current in an amplifier;
- mirroring the first reference current in the first leg to generate a feedback current;
- generating a reference voltage at an output terminal based on the feedback current;
- and
- providing the feedback current to the second leg of the current generator, wherein the second reference current is a function of the third reference current and the feedback current.
Dependencies are inferred from the claim text.