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US 10,296,027 B2Granted
Bandgap reference circuit
AssigneePixart Imaging Inc.
InventorKok-Siang Tan
Life of this patent
Estimating the term…
Abstract
A bandgap reference circuit including a clamp circuit is provided. The bandgap reference circuit performs the calibration only for one time in a normal mode to store a control code of a reference generator of the clamp circuit. In a suspend mode, the control code is used for controlling the reference generator to cause the clamp circuit to provide a desired source voltage, and a bandgap reference voltage source is shut down to reduce the power consumption.
Claims20
A bandgap reference circuit, comprising:
- a bandgap reference voltage source configured to provide a bandgap voltage;
- a clamp circuit, comprising:
- a reference generator configured to output a first reference voltage;
- a plurality of clamp switches configured to determine the first reference voltage outputted by the reference generator;
- and
- an operational amplifier configured to receive the first reference voltage and output a clamp voltage, which is configured to be provided to a downstream circuit;
- and
- a digital calibration engine configured to control the plurality of clamp switches, and store a control code of the plurality of clamp switches corresponding to a smallest difference between the clamp voltage and the bandgap voltage.
5 more elements
A bandgap reference circuit, comprising:
- a bandgap reference voltage source configured to provide a bandgap voltage;
- a clamp circuit, comprising:
- a reference generator configured to output a first reference voltage;
- a plurality of clamp switches configured to determine the first reference voltage outputted by the reference generator;
- an operational amplifier configured to receive the first reference voltage and output a clamp voltage, which is configured to be provided to a downstream circuit;
- and
- a comparator coupled to the reference generator via one input thereof and coupled to the digital calibration engine via an output thereof;
- and
- a digital calibration engine configured to control the plurality of clamp switches, and store a control code of the plurality of clamp switches corresponding to a smallest difference between the first reference voltage and the bandgap voltage.
6 more elements
A bandgap reference circuit, comprising:
- a bandgap reference voltage source configured to provide a bandgap voltage;
- a clamp circuit, comprising:
- a reference generator configured to output a first reference voltage;
- a plurality of clamp switches configured to determine the first reference voltage outputted by the reference generator;
- an operational amplifier configured to receive the first reference voltage and output a clamp voltage, which is configured to be provided to a downstream circuit;
- and
- an output switch coupled between the operational amplifier and the downstream circuit;
- a digital calibration engine configured to control the plurality of clamp switches, and store a control code of the plurality of clamp switches corresponding to a smallest difference between the first reference voltage and the bandgap voltage;
- and
- a regulator coupled between the output switch and the downstream circuit.
7 more elements
Dependencies are inferred from the claim text.