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US 2019/0103813 A1Published application
Reference voltage generator with adaptive voltage and power circuit
AssigneePixart Imaging Inc.
InventorLIEN-SHENG WEI
Life of this patent
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Abstract
There is provided a reference voltage generator for providing an adaptive voltage. The reference voltage generator includes a steady current source and a PMOS transistor and an NMOS transistor cascaded to each other. A reference voltage provided by the reference voltage generator is determined by gate-source voltages of the PMOS transistor and the NMOS transistor. As said gate-source voltages vary with the temperature and manufacturing process, the reference voltage forms a self-adaptive voltage.
Claims17
A reference voltage generator, comprising:
- a steady current source configured to provide a steady current;
- a PMOS transistor, a source electrode of the PMOS transistor being configured to receive the steady current;
- and
- an NMOS transistor, a drain electrode of the NMOS transistor being electrically connected to a drain electrode of the PMOS transistor at a node,
- wherein a reference voltage provided by the reference voltage generator is outputted at the source electrode of the PMOS transistor,
- gate electrodes of the PMOS transistor and the NMOS transistor are connected to the node such that the drain and gate electrodes of the PMOS transistor and the drain and gate electrodes of the NMOS transistor are connected together, and
- at least one additional PMOS transistor or at least one additional NMOS transistor is further coupled between the drain electrodes of the NMOS transistor and the PMOS transistor.
4 more elements
A reference voltage generator, comprising:
- a PMOS transistor;
- an NMOS transistor, a drain electrode of the NMOS transistor being electrically connected to a drain electrode of the PMOS transistor at a node;
- and
- a steady current source configured to provide a steady current flowing out from a source electrode of the NMOS transistor,
- wherein a reference voltage provided by the reference voltage generator is outputted at the source electrode of the NMOS transistor,
- gate electrodes of the PMOS transistor and the NMOS transistor are connected to the node such that the drain and gate electrodes of the PMOS transistor and the drain and gate electrodes of the NMOS transistor are connected together, and
- at least one additional PMOS transistor or at least one additional NMOS transistor is further coupled between the drain electrodes of the NMOS transistor and the PMOS transistor.
4 more elements
A power circuit, comprising:
- a reference voltage generator comprising a steady current source, at least one PMOS transistor and at least one NMOS transistor cascadely coupled to one another, wherein the at least one PMOS transistor has a first gate-source voltage, the at least one NMOS transistor has a second gate-source voltage, and the reference voltage generator is configured to provide a reference voltage which is determined by the first gate-source voltage and the second gate-source voltage;
- and
- a regulator configured to receive the reference voltage and generate an adaptive voltage that self-adjusts with temperature and manufacturing processes.
Dependencies are inferred from the claim text.