US 2020/0401177 A1 · AUTOMATICALLY CONTROLLED BANDGAP REFERENCE CIRCUIT

Abstract

Circuits, systems, and methods to automatically switch modes to provide constant reference voltages are discussed herein. For example, a bandgap reference system may include a first bandgap reference circuit configured to provide a first bandgap reference voltage, a low dropout regulator coupled to the first bandgap reference circuit, a temperature circuit coupled to the low dropout regulator, and a second bandgap reference circuit coupled to the low dropout regulator and the temperature circuit. The second bandgap reference circuit may be configured to configure one or more impedance elements based at least in part on a temperature signal and provide a second bandgap reference voltage based on one or more currents that pass through the one or more impedance elements.

Claims20

Dependent claims

A bandgap reference system comprising:

a first bandgap reference circuit configured to provide a first bandgap reference voltage;
a low dropout regulator coupled to the first bandgap reference circuit, the low dropout regulator configured to receive the first bandgap reference voltage and provide a regulated voltage based at least in part on the first bandgap reference voltage;
a temperature circuit coupled to the low dropout regulator, the temperature circuit configured to receive the regulated voltage and output a temperature signal indicating a temperature;
and
a second bandgap reference circuit coupled to the low dropout regulator and the temperature circuit, the second bandgap reference circuit configured to configure one or more impedance elements based at least in part on the temperature signal and provide a second bandgap reference voltage based at least in part on one or more currents that pass through the one or more impedance elements.

2 more elements

A bandgap reference circuit comprising:

a current generation circuit to generate a Proportional-to-Absolute-Temperature (PTAT) current and provide the PTAT current to a node;
an input bandgap circuit coupled to the node, the input bandgap circuit to receive an input bandgap reference voltage from another bandgap reference circuit and control a first current to the node based at least in part on a temperature signal, the first current being associated with the input bandgap reference voltage;
and
a reference voltage circuit coupled to the node and including one or more impedance elements, the reference voltage circuit to configure the one or more impedance elements based at least in part on the temperature signal, receive a second current via the node, and provide an output bandgap reference voltage based at least in part on the second current passing through the one or more impedance elements.

1 more element

Dependencies are inferred from the claim text.

Automatically controlled bandgap reference circuit

Life of this patent

Automatically controlled bandgap reference circuit

Life of this patent

Abstract

Claims20