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US 11,637,534 B2Granted
Bandgap amplifier biasing and startup scheme
AssigneeTexas Instruments Incorporated
InventorVenkateswara Reddy Pothireddy
Life of this patent
Estimating the term…
Abstract
In an example, a system includes an amplifier configured to produce a bandgap voltage reference. The system also includes a current source configured to provide a current to bias the amplifier. The system includes a switching circuit configured to receive a first current replica signal and a second current replica signal, the switching circuit further configured to cause the current source to provide the current to bias the amplifier based on either the first current replica signal or the second current replica signal.
Claims20
A system, comprising:
- an amplifier configured to produce a bandgap voltage reference;
- a current source configured to provide a current to bias the amplifier;
- and
- a switching circuit configured to receive a first current replica signal and a second current replica signal, the switching circuit further configured to cause the current source to provide the current to bias the amplifier based on either the first current replica signal or the second current replica signal.
1 more element
A system, comprising:
- an amplifier having an amplifier output, a first amplifier input, and a second amplifier input;
- a first current mirror coupled to the amplifier and configured to bias the amplifier;
- a second current mirror coupled to the first current mirror and configured to provide a first current to bias the amplifier;
- a current source coupled to the first current mirror and configured to provide a second current to bias the amplifier, wherein the second current is provided at least in part by the amplifier output;
- and
- a switching circuit configured to select either the first current or the second current to bias the amplifier.
3 more elements
A method, comprising:
- providing a first bias current to an amplifier during startup of the amplifier, wherein the amplifier is configured to produce a bandgap voltage reference;
- producing a proportional to absolute temperature (PTAT) current with the amplifier;
- providing a second bias current to the amplifier after the startup of the amplifier, wherein the second bias current is based at least in part on the PTAT current;
- and
- responsive to providing the second bias current to the amplifier, reducing the first bias current provided to the amplifier.
2 more elements
Dependencies are inferred from the claim text.