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US 12,566,467 B2Granted
Current generator for IDAC for corner independence
AssigneeSTMicroelectronics International N.V.
InventorsCedric Pastorelli, Steven Collins
Life of this patent
Estimating the term…
Abstract
Apparatuses, systems, and methods for improved current generators for IDAC corner independence are provided. An exemplary apparatus may include current generator circuitry and a IDAC. The current generator circuitry is configured to generate a reference current. The IDAC is configured to generate an IDAC current based at least on the reference current. The current generator circuitry may adjust or update the reference current based on a change in temperature and/or process. This results in an adjustment or update in the IDAC current.
Claims20
An apparatus comprising:
- a current generator circuitry comprising:
- an op amp comprising a first input, a second input, and an output, wherein the first input is electrically connected to a reference voltage;
- a first FET comprising a first drain, a first gate, and a first source, wherein the first gate is connected to the output of the op amp;
- a resistor comprising a first terminal and a second terminal, wherein the first terminal is electrical connected to the first source and to the second input of the op amp, and wherein the second terminal is electrically connected to a ground;
- a voltage supply;
- a second FET comprising a second drain, a second gate, and a second source, wherein the second drain is electrically connected to a voltage source;
- a third FET comprising a third drain, a third gate, and a third source, wherein the third drain is electrically connected to the voltage source, and wherein the third gate is electrically connected to the second gate, the second source, and to the first drain;
- an output terminal of the current generator circuitry, wherein the output terminal of the current generator circuitry is electrically connected to the third source;
- and
- an IDAC electrically connected to the output terminal of the current generator circuitry.
7 more elements
A method comprising:
- generating a first reference current with a current generator circuitry, wherein the current generator circuitry comprises:
- an op amp comprising a first input, a second input, and an output, wherein the first input is electrically connected to a reference voltage;
- a first FET comprising a first drain, a first gate, and a first source, wherein the first gate is connected to the output of the op amp;
- a resistor comprising a first terminal and a second terminal, wherein the first terminal is electrical connected to the first source and to the second input of the op amp, and wherein the second terminal is electrically connected to a ground;
- a voltage supply;
- a second FET comprising a second drain, a second gate, and a second source, wherein the second drain is electrically connected to a voltage source;
- a third FET comprising a third drain, a third gate, and a third source, wherein the third drain is electrically connected to the voltage source, and wherein the third gate is electrically connected to the second gate, the second source, and to the first drain;
- an output terminal of the current generator circuitry, wherein the output terminal of the current generator circuitry is electrically connected to the third source;
- generating a first IDAC current with an IDAC at a first time based on the first reference current, wherein the IDAC is electrically connected to the output terminal of the current generator circuitry;
- generating an adjusted reference current with the current generator circuitry at a second time based on a change in temperature;
- generating an adjusted IDAC current with the IDAC at a second time based on the adjusted reference current.
8 more elements
Dependencies are inferred from the claim text.