Hybrid voltage regulator with a wide regulated voltage range
AssigneeQUALCOMM Incorporated
InventorMadjid Hafizi
Life of this patent
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Abstract
In certain aspects, a voltage regulator includes a pass n-type field effect transistor (NFET) coupled between a first voltage rail and a second voltage rail, and a pass p-type field effect transistor (PFET) coupled between the first voltage rail and the second voltage rail. The voltage regulator also includes a first amplifier having an output, a first switch coupled between the output of the first amplifier and a gate of the pass NFET, a second amplifier having an output, and a second switch coupled between the output of the second amplifier and a gate of the pass PFET, a third switch coupled between the gate of the pass NFET and a ground, and a fourth switch coupled between the gate of the pass PFET and the second voltage rail.
Claims14
A chip, comprising:
- a voltage regulator, wherein the voltage regulator comprises:
- a pass n-type field effect transistor (NFET) coupled between a first voltage rail and a second voltage rail;
- a pass p-type field effect transistor (PFET) coupled between the first voltage rail and the second voltage rail;
- a first amplifier having an output;
- a first switch coupled between the output of the first amplifier and a gate of the pass NFET;
- a second amplifier having an output;
- a second switch coupled between the output of the second amplifier and a gate of the pass PFET;
- a third switch coupled between the gate of the pass NFET and a ground;
- a fourth switch coupled between the gate of the pass PFET and the second voltage rail;
- and
- a driver, wherein the driver comprises
- a pull-down transistor coupled between an output of the driver and the ground,
- a pull-up NFET coupled between the first voltage rail and the output of the driver,
- a pull-up PFET coupled between the first voltage rail and the output of the driver,
- a fifth switch coupled between a gate of the pull-up NFET and the ground, and
- a sixth switch coupled between a gate of the pull-up PFET and the second voltage rail.
A chip, comprising:
- a voltage regulator, wherein the voltage regulator comprises
- a pass n-type field effect transistor (NFET) coupled between a first voltage rail and a second voltage rail;
- a pass p-type field effect transistor (PFET) coupled between the first voltage rail and the second voltage rail;
- a first amplifier having an output;
- a first switch coupled between the output of the first amplifier and a gate of the pass NFET;
- a second amplifier having an output;
- a second switch coupled between the output of the second amplifier and a gate of the pass PFET;
- a third switch coupled between the gate of the pass NFET and a ground;
- a fourth switch coupled between the gate of the pass PFET and the second voltage rail;
- a first compensation circuit coupled to the gate of the pass NFET;
- a second compensation circuit coupled to the gate of the pass PFET;
- and
- a fifth switch coupled between the second compensation circuit and a drain of the PFET.
Dependencies are inferred from the claim text.